Articles

Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.

1,112 results found
Article

Multiple endocrine neoplasia syndromes

Multiple endocrine neoplasia (MEN) syndromes are a collection of syndromes characterised by the presence of, as the name would suggest, multiple endocrine tumours. They are autosomal dominant in inheritance. MEN1 (Wermer syndrome) MEN2 (multiple endocrine adenomatosis) MEN2a (Sipple syndrome)...
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Multiple filling defects of the ureter (differential)

Multiple filling defects within a ureter, as seen on conventional IVU or CT IVU, have a relatively small differential including: spreading or multifocal transitional cell carcinoma (TCC) vascular indentations multiple ureteral stones (steinstrasse) blood clots ureteritis cystica Stevens-Jo...
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Multiple intracranial calcifications

Intracranial calcifications are common in certain locations and often are of no clinical concern. The two most commonly encountered types of calcification include:  normal age-related intracranial calcifications intracranial arterial atherosclerosis Concerning calcifications are much less co...
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Myelination pattern on MRI

Myelination of the brain during infancy progresses in an orderly and predictable fashion which can be assessed with MRI.  At term (40 weeks corrected gestation) only certain structures are myelinated: dorsal brainstem ventrolateral thalamus lentiform nuclei central corticospinal tracts pos...
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Myocardial perfusion and viability

Myocardial perfusion and viability assessment is important for many reasons: to diagnose, locate and grade the severity of coronary artery disease to identify candidates who would benefit from re-vascularization to evaluate response of re-vascularization Terminology Stunned myocardium It r...
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Myometrial cysts

Myometrial cysts are cysts seen in the myometrium and these can be differentiated appropriately based on location and sonological or Doppler features. Pathology Aetiology They can arise from variable aetiology and include. adenomyosis: the cysts are most often seen in the endomyometrial junc...
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Myonecrosis

Myonecrosis is a myopathy involving infarction of skeletal muscle and can have the appearances of an intramuscular mass.  Pathology Myonecrosis has a variety of causes 1,2: idiopathic sickle cell crisis diabetic myonecrosis post-traumatic (see: calcific myonecrosis) compartment syndrome ...
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Named fractures

Named fractures are usually eponymous or occupational. The simplest way of spiting them up is by body area: spinal fractures facial fractures upper extremity fractures pelvic fractures lower extremity fractures
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Narrow fetal thorax

A narrow fetal thorax on antenatal ultrasound can be present with a number of anomalies which include: achondrogenesis camptomelic dysplasia homozygous achondroplasia Jarcho-Levin syndrome Jeune syndrome - asphyxiating thoracic dysplasia Russell-Silver dwarfism short rib polydactyly syndr...
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Narrowing of interpedicular distance

The interpedicular (IP) distance which is the distance measured between the pedicles on frontal / coronal imaging can be narrowed in a number of situations  Causes include achondroplasia 3 thanatophoric dysplasia 2 See also  widening of interpedicular distance  See reference 1 for an old b...
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Neonatal encephalopathy

Neonatal encephalopathy is a clinical syndrome referring to signs and symptoms of abnormal neurological function in the first few days of life in a neonate born at or beyond 35 weeks of gestation. It is described as difficulty with initiating and maintaining respiration, depression of tone and r...
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Neonatal lines and tubes

Neonatal lines and tubes are widely used in the NICU (neonatal intensive care unit) in the management of critically ill neonates. Examples include: nasogastric (NG) tube endotracheal (ET) tube central venous line umbilical artery catheter umbilical vein catheter Nasogastric tube The NG tu...
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Neonatal respiratory distress (causes)

Causes of neonatal distress can be broadly split into intrathoracic, extrathoracic and systemic: Intrathoracic Medical respiratory distress syndrome (RDS) transient tachypnoea of the newborn (TTN) meconium aspiration syndrome bronchopulmonary dysplasia (BPD) patent ductus arteriosus (PDA)...
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Neoplasms of the appendix

There are a number of neoplasms that can involve the vermiform appendix, some of which are peculiar to this site. Epidemiology Tumours involving the appendix have been found in only about 1% of all appendectomy specimens 9. Epithelial neoplasms and neuroendocrine tumours represent the vast maj...
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Neoplasms of the cauda equina (differential)

The differential diagnosis for masses of the cauda equina region is often considered separately to the remainder of the spinal cord. It is often difficult to determine whether masses in this region are intramedullary or intradural-extramedullary. Most common tumours myxopapillary ependymoma b...
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Nephrocalcinosis

Nephrocalcinosis, previous known as Anderson-Carr kidney or Albright's calcinosis, refers to the deposition of calcium salts in the parenchyma of the kidney. It is divided into several types, with differing aetiologies, based on the distribution: medullary nephrocalcinosis: 95% cortical nephro...
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Nerve root enhancement

Nerve root enhancement is phenomenon described on post contrast MRI scans that can be observed in a number of situations. Common causes post-operative states post-operative nerve root enhancement arachnoiditis leptomeningeal metastases disseminated spinal leptomeningeal metastases HIV vac...
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Neuroblastic tumours

Neuroblastic tumours arise from primitive cells of the sympathetic system and include the following entities: neuroblastoma ganglioneuroblastoma ganglioneuroma These entities represent a spectrum of disease from undifferentiated and aggressive (neuroblastoma) to the well differentiated and l...
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Neuroblastoma vs Wilms tumour

Both neuroblastoma and Wilms tumour occur in early childhood and typically present as large abdominal masses closely related to the kidneys. Distinguishing between the two is important, and a number of features are helpful. Neuroblastoma calcification very common: 90% encases vascular structu...
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Neurofibromatosis

Neurofibromatoses (NF) comprise a number of clinically and genetically distinct inherited conditions that carry a high risk of tumour formation. They fall under the wider classification of phakomatoses. The tumours particularly involve the central and peripheral nervous systems: neurofibromatos...
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Nightstick fracture

Nightstick fractures are isolated fractures of the ulna, typically transverse and located in the mid-diaphysis and usually resulting from a direct blow. It is a characteristic defensive fracture when the patient tries to ward off an overhead blow from an assailant (or local law enforcement offic...
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Nipple markers

Nipple markers can be a useful technique in the evaluation of densities overlying the expected position of the nipple on a chest radiograph. Not uncommonly a small round opacity projects over the lower thorax on a chest radiograph (see: solitary pulmonary nodule). Often, especially in women, th...
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Nipple shadows

Nipple shadows refer to the silhouettes of the nipples on frontal chest radiographs. Epidemiology Nipple shadows are apparent on ~7.5% (range 3.5-11%) of frontal chest x-rays 1. Pathology It has been proposed by Miller et al. that solitary pulmonary nodules that reach some or all of the foll...
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Nodular filling defects of duodenum (differential)

Nodular filling defects due to mucosal lesions in the duodenum are due to a number of processes. For a differential list which includes non-mucosal lesions see duodenal filling defects. The differential diagnosis for mucosal lesions includes:  heterotopic gastric mucosa 1-2 mm clustered onl...
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Nodular pleural thickening

Nodular pleural thickening is a form of pleural thickening. Pathology Aetiology Essentially all common causes of nodular pleural thickening are malignant and include: metastatic pleural disease, particularly from adenocarcinomas, e.g. bronchogenic adenocarcinoma breast cancer ovarian canc...
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Non-accidental injuries

Non-accidental injuries (NAI) represent both ethical and legal challenges to treating physicians. Radiologists are often the first to suspect NAI when confronted with particular injury patterns, and a knowledge of these is essential if the opportunity to save a child from future neglect is not ...
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Non-calcified hyperdense pulmonary nodules

Non-calcified hyperdense pulmonary nodules are predominantly the result of inhalational exposure to substances, although embolisation of material may cause dense nodular opacification within the lung. inhalation disease, e.g. pneumoconioses pulmonary baritosis (barium dust) pulmonary siderosi...
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Non-neoplastic solid lesions of the pancreas

Non-neoplastic solid lesions of the pancreas are conditions which may mimic pancreatic neoplasms on imaging. They include: focal pancreatitis autoimmune pancreatitis fatty infiltration-replacement intrapancreatic accessory spleen peripancreatic lymph node congenital anomalies prominent pa...
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Non-seminomatous germ cell tumours

Non-seminomatous germ cell tumours (NSGCT) is one of the main groups of germ cell tumours (the other being seminoma). Although they are made up of distinct histological entities, in general, they have similar radiographic appearances. They can, however, be found widely in the body, with variable...
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Non-small-cell lung cancer

Non-small-cell lung cancer represents a heterogeneous group of lung cancers that do not have small-cells on histology. They are thus separated, as small cell carcinoma of the lung has distinctive management implications. The major histological types include: adenocarcinoma of lung squamous cel...
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Normal intracranial calcifications

Normal intracranial calcifications can be defined as all age-related physiologic and neurodegenerative calcifications that are unaccompanied by any evidence of disease and have no demonstrable pathological cause. The most common sites include: pineal gland seen in 2/3 of the adult population ...
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Normal radiological reference values

A list of normal radiological reference values is as follows: adrenal gland: <1 cm thick, 4-6 cm length aorta: <3 cm diameter appendix: on CT <6 mm calibre atlantodental distance adults: <3 mm children: <5 mm azygous vein: on erect chest x-ray <10 mm diameter bladder wall: <3 mm (well-di...
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Obesity

Obesity is defined as a body mass index (BMI) greater than 30 kg/m2. It is described as being a "modern epidemic" due to increased rates of metabolic syndrome and other complications in these patients, along with a high and increasing prevalence.  Epidemiology Obesity rates vary around the wor...
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Obstruction of nasolacrimal drainage apparatus

Obstruction of nasolacrimal drainage apparatus results in epiphora and can be primary or secondary, congenital or acquired. Obstruction can occur in canaliculi, lacrimal sac, or nasolacrimal duct (post saccular) levels. Congenital obstruction is usually secondary to persistence of the membrane ...
Article

Obstructive uropathy

An obstructive uropathy is a catch-all term encompassing any cause of complete or partial, congenital or acquired and permanent or intermittent obstruction to the urinary tract. Depending on the severity of obstruction and extent, it may result in permanent change in both the collecting system p...
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Occult fracture

Occult fractures are those that are not visible on imaging, most commonly plain radiographs and sometimes CT, either due to lack of displacement or limitations of the imaging study. There may be signs of a fracture without one actually being seen. MRI or nuclear medicine studies are sometimes re...
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Ocular metastasis

Ocular metastases, also termed uveal metastases, account for over 80% of all ocular pathology, and need to be distinguished from extraocular metastasis, which are a quite different group of tumours. This article will discuss metastatic lesions affecting the orbits. For other intracranial metast...
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Ocular pathology

Ocular pathology covers a wide range of conditions and therefore represents the cause of a wide range of symptoms, signs and radiographic features. Ocular metastases account for over 80% of all ocular pathology. With regard to the remainder of ocular lesions, the primary differentiating factor ...
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Odontohypophosphatasia

Odontohypophosphatasia is the mildest form of hypophosphatasia that manifests as tooth dysplasia and/or early loss of deciduous or permanent teeth. Pathology As with all forms of hypophosphatasia, the underlying abnormality is a mutation in the ALPL gene that encodes for tissue non-specific al...
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Oesophageal dysmotility

Oesophageal dysmotility refers to the pathological disruption of the normal sequential and coordinated muscle motion of the oesophagus to transport food from the oropharynx to the stomach. It is an umbrella term used to refer to the common pathophysiological endpoint of dysmotility that can be c...
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Oligohydramnios

Oligohydramnios refers to a situation where the amniotic fluid volume is less than expected for gestational age. Often these fetuses have <500 mL of amniotic fluid. Epidemiology The estimated prevalence can be up to ~6% of pregnancies 4. Pathology Causes The causes of oligohydramnios are pr...
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Oligometastases

Oligometastases refers to distant disease that is limited in number and distribution, Niibe et al. defined this as ≤5 metastatic/recurrent lesions with control of the primary lesion 1,2. These metastases can be treated with local measures (surgery, radiation therapy, etc.) with the aim of increa...
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Omental cake

Omental cake refers to infiltration of the omental fat by material of soft-tissue density. The appearances refer to the contiguous omental mass simulating the top of a cake. Masses on the peritoneal surfaces and malignant ascites may also be present.  Pathology The most common cause is metasta...
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Omphalomesenteric fistula

Omphalomesenteric fistula occurs as aresult of failure of obliteration of the omphalomeseneric duct. It is one of the congenital fistulas of gastrointestinal tract . Treatment of choice is often a partial trans umbilical resection with umbilical restitution. See also gut fistulation
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Open reduction-internal fixation

Open reduction-internal fixation, commonly abbreviated to ORIF, refers to the orthopaedic operative management of a fracture (or fracture-dislocation complex) where reduction requires surgical (hence open) approach and internal fixation is applied. Internal fixation may be in the form of: scre...
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Ophthalmoplegia

Ophthalmoplegia describes the abnormal eye movement that occurs because of paralysis of one or more of the six extraocular muscles involved in eye movements. Classification can be based on the cause of the ophthalmoplegia or the directions of the affected movements. There are numerous causes of...
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Optic nerve enlargement

Enlargement of the optic nerves is uncommon and has a surprisingly broad differential: optic nerve glioma optic nerve meningioma orbital pseudotumour optic neuritis sarcoidosis leukemia orbital lymphoma metastases perioptic haemorrhage Erdheim-Chester disease juvenile xanthogranuloma ...
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Orbital cystic lesions

Several cystic and cyst-like orbital lesions may be encountered in imaging of the orbits: developmental orbital cysts choristoma dermoid: commonest benign orbital tumour in childhood  epidermoid teratoma  congenital cystic eye colobomatous cyst acquired abscess haematoma lacrimal glan...
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Orbital inflammatory disease (differential)

The differential diagnosis of orbital inflammatory diseases (including orbital pseudotumours) can be divided based on their location into: dacryoadenitis of lacrimal glands myositis of extraocular muscles perineuritis of optic nerve orbital cellulitis preseptal postseptal orbital apiciti...
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Orbital mass

An orbital mass carries a relatively wide differential: tumours lymphoma metastasis lacrimal gland or duct tumours rhabdomyosarcoma of the orbit retinoblastoma optic nerve meningioma optic nerve glioma optic nerve schwannoma  neurofibroma developmental orbital cysts 3: choristoma ep...
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Orbital vascular lesions

Orbital vascular lesions may be difficult to distinguish on imaging. However, the following conditions have been described: arteriovenous malformation capillary haemangioma cavernous haemangioma lymphangioma / lymphangiovenous malformation / venolymphatic malformation orbital venous malform...
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Osseous lesions preferentially involving the epiphysis

Apophyses are identical to epiphyses as far as differential diagnosis of lytic lesions, with exception of geodes, which only occur adjacent to articular surfaces. chondroblastoma (Codman tumour) clear cell chondrosarcoma giant cell tumour (after fusion of epiphyseal plate; originates in metap...
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Osteoarthritis of the vertebral column

Osteoarthritis of the vertebral column, also known as spondylosis deformans, is common and usually merely referred to as spinal "degenerative change". Complications such as spinal stenosis are important to recognise.  Radiographic features The hallmark of osteoarthritis in the spine, as is the...
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Osteochondritis dissecans of the elbow

Elbow involvement in osteochondritis dissecans is rare. It is defined as a localised fragmentation of bone overlying the capitellum cartilage. For a general discussion of osteochondritis dissecans refer to the parent article - osteochondritis dissecans. Epidemiology Most commonly seen in young...
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Osteochondrosis

Osteochondrosis is the descriptive term given to a group of disorders that affect the progress of bone growth by bone necrosis. It is only seen in children and adolescents who are still growing. The commoner examples include: Legg-Calve-Perthes disease Freiberg infraction Kienbock disease K...
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Osteoid lesions

The differential diagnosis for osteoid lesions includes: bone island (enostosis) associations: osteopoikilosis, osteopathia striata, melorheostosis osteoma osteoid osteoma osteoblastoma osteosarcoma See also cartilaginous lesions fibrous lesions
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Osteoporosis circumscripta cranii

Osteoporosis circumscripta cranii (also known as osteolysis circumscripta) refers to discrete radiolucent regions of the skull on plain radiographs. They are often seen in context of the lytic (incipient-active) phase of Paget disease of the skull, but may be observed in other circumstances as w...
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Osteoporosis (differential)

The differential for osteoporosis includes: idiopathic endocrine hypogonadism ovarian postmenopausal testicular eunuchoidism Cushing syndrome diabetes mellitus acromegaly Addison’s disease hyperthyroidism mastocytosis (mast cells produce heparin) pseudohypoparathyroidism pseudopse...
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Otitis media

Otitis media refers to inflammation or infection of the middle ear cavity. It is commonly seen in children and is termed otomastoiditis when inflammation spreads to involve the mastoid. Clinical presentation Common complaints include otalgia, otorrhoea, headache, fever, and systemic upset. In ...
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Ovarian cystic neoplasms

Ovarian cystic neoplasms can be either benign or malignant and can arise from epithelial, stromal, or germ cell components. In general, the risk of malignancy in unilocular cystic tumours <10 cm in women over the age of 50 years is thought to be low 3-4. benign ovarian mature cystic teratoma ...
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Ovarian lesions with T2 hypointensity

A hypointense ovarian lesion on T2 weighted MRI is usually a sign of benignity.  The low signal is considered to be due to fibrosis and blood products 1. Lesions that can give this appearance include 1: endometrioma Brenner tumour ovarian fibroma ovarian fibrothecoma ovarian cystadenofibro...
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Ovarian tumours

Ovarian tumours are relatively common and account for ~6% of female malignancies. This article focuses on the general classification of ovarian tumours. For specific features, refer to the subarticles. Pathology Subtypes Primary ovarian tumours Surface epithelial-stromal ovarian tumours (60-...
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Ovarian tumours associated with endometrial thickening

There are several ovarian tumours associated with endometrial thickening and is often due to oestrogenic effects of the ovarian tumour. Such tumours include: ovarian epithelial tumours endometroid carcinoma of the ovary may have synchronous endometrial carcinoma or endometrial hyperplasia, p...
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Oxalosis

Oxalosis results in supersaturation of calcium oxalate in the urine (hyperoxaluria), which in turn results in nephrolithiasis and cortical nephrocalcinosis.  This article focus on the secondary oxalosis, please refer to primary oxalosis for a specific discussion on this entity.  Pathology Cal...
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Paediatric cervical lesions (differential)

The differential diagnosis of paediatric cervical lesions is commonly encountered in practice, unfortunately, the list is long.  Differential diagnosis Inflammatory Most lesions tend to be inflammatory 3: nontuberculous lymphadenitis scrofula sialodochitis abscess infected branchial cle...
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Paediatric clavicle abnormalities

The clavicle is a unique bone and as such it often displays unique pathology. The following is an attempt to summarise paediatric clavicle abnormalities. Paediatric bone tumours and tumour-like lesions of the clavicle majority of clavicular tumours are malignant Ewing sarcoma (most common) o...
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Paediatric nasal cavity masses

Paediatric nasal cavity masses can occur within the nose or the nasopharynx. These masses are often found incidentally on imaging but can be readily apparent clinically. Clinical presentation The clinical features of these lesions tend to mimic upper respiratory processes and may result in del...
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Paediatric renal tumours and masses

Paediatric renal tumours and masses are another group of diseases (just like cystic renal diseases in both the adult and child) that are bewildering in their number, nomenclature and overlapping findings. Commoner lesions Wilms tumour: common in older children 1-8 years old mesoblastic nephro...
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Paediatric skeletal metasases (differential)

There is a wide range of primary malignancies that results in paediatric skeletal metastases 1: neuroblastoma leukaemia: although not truly metastases lymphoma clear cell sarcoma: Wilms’ variant rhabdomyosarcoma retinoblastoma Ewing’s sarcoma: lung metastases much more common osteosarcom...
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Pancreatic atrophy

Pancreatic atrophy is non-specific and is common in elderly patients, although in younger patients it can be a hallmark of pathology. Most commonly it is associated with aging, obesity and end-stage chronic pancreatitis.  It occurs principally with fatty replacement of the pancreas (pancreatic ...
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Pancreatic calcifications

Pancreatic calcifications can arise from many aetiologies. Punctate intraductal calcifications chronic pancreatitis alcoholic pancreatitis (20-40%) 2  intraductal, numerous, small, irregular preponderant cause of diffuse pancreatic intraductal calcification gallstone pancreatitis (2%) 2 ​...
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Pancreatic neoplasms

There are numerous primary pancreatic neoplasms, in part due to the mixed endocrine and exocrine components. Classification Classification based on function exocrine: ~99% of all primary pancreatic neoplasms pancreatic ductal adenocarcinoma ~90-95% cystic neoplasm intraductal papillary muc...
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Pancreatitis

Pancreatitis (plural: pancreatitides) refers to inflammation involving the pancreas.  It has various forms which can be classified in many many ways according to time of onset, aetiological agent or associated pathology. acute pancreatitis interstitial oedematous pancreatitis necrotising pan...
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Pantaloon hernia

A pantaloon hernia (dual hernia, Romberg's hernia or saddle bag hernia) is defined as ipsilateral, concurrent direct and indirect inguinal hernias. Hernial sacs are present on both sides of the inferior epigastric vessels, and separated by the posterior wall of the inguinal canal brought down by...
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Papillary lesions of the breast

Papillary lesions of the breast comprise a wide group and range from benign to malignant. Pathology They develop as tufts of epithelium with a fibrovascular core that arborize into branching papillae and protrude into the duct lumen. Benign papilloma of breast / intraductal papilloma of the b...
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Paralabral cyst

Paralabral cysts are type of cyst located adjacent to a cartilage labrum of large joints. They are typically described in the shoulder and hip. Please refer to the sub-articles of discussion of these. paralabral cyst of the shoulder paralabral cyst of the hip
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Parasyndesmophytes

Parasyndesmophytes or floating syndesmophytes are, as the name suggests, paravertebral dystrophic soft tissue calcifications or heterotopic ossifications. Pathology They are known to be seen in psoriatic arthritis and reactive arthritis 4. Radiographic features Initially they begin at a dist...
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Paratesticular lesions

Paratesticular lesions have a large list of differential diagnosis: epididymal cyst (most common epididymal mass) adenomatoid tumour (most common epididymal tumour) scrotal tunica cysts tunica vaginalis cyst tunica albuginea cyst hydrocoele scrotal haematocoele varicocoele scrotolith (s...
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Paratesticular tumours

A paratesticular mass may derive from a number of structures that surround the testicle within the scrotum; most commonly, they derive from the spermatic cord.  Pathology The masses can be categorised as benign (70%) or malignant (30%). Aetiology Benign spermatic cord lipoma (most common pa...
Article

Parkinson-plus syndrome

Parkinson-plus syndrome refers to a loose group of neurodegenerative disorders that are characterised by features of Parkinson disease but with other neurological symptoms/signs. They have a poor response to levodopa, and mostly have fairly characteristic neuroimaging features.  Conditions incl...
Article

Parotid enlargement

Parotid enlargement (also known as parotidomegaly) has a wide differential given the significant breadth of pathology that can affect the parotid gland. These can be separated by the standard surgical sieve approach into infective, inflammatory, immune, neoplastic, infiltrative, and congenital c...
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Patella alta

Patella alta, or a high riding patella, describes a situation where the position of the patella is considered high. It may be idiopathic or may result secondary to a patellar tendon rupture.  Epidemiology Associations Several conditions are known to be associated with patella alta, including:...
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Patella baja

Patella baja (or patella infera) is an abnormally low lying patella, which is associated with restricted range of motion, crepitations, and retropatellar pain. If longstanding, extensor dysfunction may ensue with significant morbidity.  It is seen in a variety of clinical scenarios including 1: ...
Article

Patellar tendon rupture

Patellar tendon rupture is one of the extensor mechanism of the knee injuries and occurs almost invariably at either the patellar or tibial insertion of the patellar tendon, when in the setting of trauma, and is often associated with a small avulsion fracture. Most commonly, it is at the superi...
Article

Patellar tumours

Patellar tumours are extremely rare. They can be either benign or malignant primary bone tumours, or metastases.  Epidemiology Patellar tumours represent just 0.1% of all primary bone tumours 1.  Clinical presentation Patients may present with anterior knee pain and/or a palpable mass 1,3. ...
Article

Pathological fracture

Pathological fractures are fractures that occur in abnormal bone. Although the term can be used in the setting of a generalised metabolic bone disease, it is usually reserved for fractures through a focal abnormality. The abnormality may be malignant or non-malignant in nature. Pathological fra...
Article

Patterns of bone contusion in knee injury

Pattern of bone contusion in knee injuries can give clues for the mechanism and associated injuries.  Radiographic features Five classic bone contusion patterns have been described 1-4: pivot-shift injury valgus stress to flexed and externally rotated knee contusion pattern: posterolateral ...
Article

Patterns of neonatal hypoxic–ischaemic brain injury

Neonatal hypoxic ischaemic brain injuries can manifest in different patterns of involvement depending on the severity and timing of the insult. When considering the perinatal maturation process of the brain and the severity of an insult, it is possible to understand the various manifestations. ...
Article

Pear-shaped bladder

Pear-shaped (or teardrop-shaped) bladder is one whose normal round or ovoid shape has been extrinsically compressed to resemble a pear. The pear may be inverted or upright, depending on how the excess pelvic tissue compresses the bladder. Pathology Aetiology Causes of a pear-shaped bladder in...
Article

Pedunculated intratracheal mass

A pedunculated intratracheal mass has a variety of differential diagnoses: benign tumour, e.g. hamartoma, chrondroma, lipoma haemangioma inspissated mucus metastasis to tracheal mucosa, e.g. renal cell carcinoma, melanoma polyp, e.g. inflammatory, antrochoanal papilloma post-intubation tr...
Article

Pelvic digit

Pelvic digit, also known as a pelvic rib, pelvic finger or 11th finger, is a rare congenital abnormality where there is development of bony tissue in the soft tissue pelvis and less commonly in the abdomen. They can be associated with one or more pseudoarticulation. They are usually unilateral, ...
Article

Pelvic masses in females

Pelvic masses in females carry a broad differential diagnosis: benign adnexal cyst: 34% leiomyoma: 14% pelvic malignancy: 14% dermoid: 13% endometriosis: 10% pelvic inflammatory disease: 8% tubo-ovarian abscess hydrosalpinx pregnancy Extra-gynaecological masses, e.g. colorectal carcino...
Article

Pelvic pain in the exam

It is important to have a systematic way of approaching a case with pelvic pain in the exam.  Most examinations are performed using ultrasound. Always say that you would further assess the uterus with 3D ultrasound. You may also say that in my department we would perform a sonohysterogram. Only...

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