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.

1,132 results found
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Mitral valve disease

Mitral valve disease (MVD) principally comprise of a two main functional abnormalities, which can occur in isolation or in combination: mitral regurgitation mitral stenosis In addition other pathologies that affect the mitral valve include: mitral valve prolapse mitral annular calcification...
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Mixed cystic and solid pituitary region mass

A mixed cystic and solid pituitary region mass has a limited differential: craniopharyngioma both papillary (more solid) and adamantimonatous (more cystic) macroadenoma cystic change / necrosis / previous haemorrhage Most other solid and enhancing pituitary region masses can have cystic are...
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Mixed lytic and sclerotic bone metastases

Mixed lytic and sclerotic bone metastases are seen in a number of malignancies: breast carcinoma: typically sclerotic but 25% are mixed lung carcinoma: typically lytic but 15% are mixed carcinoma of the cervix testicular tumours prostate carcinoma: typically sclerotic but 15% are mixed
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Moguls of the heart

The 'moguls of the heart' refer to the bulges of the cardiomediastinal contour on frontal chest radiographs. The cardiomediastinal bulges are likened to skiing moguls (bumps of packed snow on a mountainside sculptured by turning skis). Awareness of their usual locations and aetiologies is helpfu...
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Monoarticular arthropathy

Monoarticular arthropathy can result from a number of causes: infectious arthritis gout HADD (hydroxyapatite deposition disease) traumatic arthritis secondary osteoarthritis avascular necrosis PVNS synovial osteochondromatosis osteochondritis dissecans
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Mosaic attenuation pattern in lung

Mosaic attenuation is the description given to the appearance at CT where there is a patchwork of regions of differing attenuation.  It is a non-specific finding, which may be seen in any of the following: obstructive small airways disease: low attenuation regions are abnormal and reflect decre...
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Mostly / purely cystic pituitary region masses

Mostly / purely cystic pituitary region masses have a small differential, including: Rathke's cleft cyst arachnoid cyst empty sella craniopharyngioma (adamantimonatous type): 90% have calcification  epidermoid cyst See also pituitary gland pituitary MRI - an approach pituitary region ma...
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Moyamoya syndrome

Moyamoya syndrome, also termed the moyamoya pattern or phenomenon, is due to numerous conditions that can cause arterial occlusion of the circle of Willis, with resultant collaterals, and appearances reminiscent of moyamoya disease. These conditions include 1-4 : vessel wall abnormalities athe...
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Mucinous cystic neoplasms of the pancreas

Mucinous cystic neoplasms of the pancreas are the most common cystic neoplasm of the pancreas and include: mucinous cystadenoma of pancreas mucinous cystadenocarcinoma of pancreas intraductal papillary neoplasms (IPMN) of the pancreas: sometimes classified separately
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Mucocele

A mucocele simply refers to accumulation and expansion of a structure by mucus. It occurs in a variety of locations which are discussed separately: paranasal sinus mucocele oral cavity e.g. ranula, mucous retention cysts mucocele of the appendix 1 mucocele of the gallbladder mucocele of the...
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Mucoid impaction (lung)

Mucoid impaction, also referred to as mucus plugging or a bronchocele, is a commonly encountered pathological feature seen in chest radiography and thoracic CT scanning. It is usually defined as airway filling by mucoid secretions and can be obstructive or non-obstructive.  Pathology Aetiology...
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Mucopolysaccharidoses

Mucopolysaccharidoses (MPS) constitute a group of hereditary disorders, one of a number of lysosomal storage disorders, having in common an excessive accumulation of mucopolysaccharides secondary to deficiencies in specific enzymes (lysosomal hydrolases) responsible for degradation of mucopolysa...
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Multicentric breast cancer

A multicentric breast cancer is a term given to a breast cancer where there are two or more breast cancers separated by normal breast tissue (often taken as 5 cm of separation 4). It is related to but distinct from the term multifocal breast cancer. At a pathological level It can also mean 2 t...
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Multicentric reticulohistiocytosis

Multicentric reticulohistiocytosis (MRH) also known as lipoid dermatoarthritis, is a rare systemic disorder. Pathology MRH is considered a form of granulomatous disease 10 characterised by infiltration of multinucleated histiocytes into various tissues, primarily affecting skin and synovium, w...
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Multifocal breast cancer

Multifocal breast cancer refers to two or more individual breast cancers diagnosed at the same time within the same quadrant of the same breast 1. 
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Multilayered periosteal reaction

Multilayered periosteal reaction, also known as a lamellated or onion skin periosteal reaction, demonstrates multiple concentric parallel layers of new bone adjacent to the cortex, reminiscent of the layers on an onion. The layers are thought to be the result of periods of variable growth 2. Pa...
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Multiple cranial nerve thickening and enhancement

The most common causes of multiple cranial nerve thickening and enhancement include: metastasis (most common) neurofibromatosis type II lymphoma and leukaemia  multiple sclerosis chronic inflammatory demyelinating polyneuropathy Lyme disease  See also cranial nerve enhancement: for compl...
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Multiple cystic neck lesions (differential)

The differential diagnosis for multiple cystic neck lesions is different to that for a solitary cystic neck mass. Differential diagnosis Cystic neck lesions are seen in: necrotic metastatic SCC nodes: older patient, M>F papillary thyroid carcinoma metastases: usually a younger patient, F>M ...
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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 birth only certain structures are myelinated: dorsal brainstem ventrolateral thalamus lentiform nuclei central corticospinal tracts posterior limb of the internal ca...
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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

Myometrium cysts are cysts seen in the myometrium and these can be differentiated appropriately based on location and sonological or Doppler features. Pathology Aetiology adenomyosis: the cysts are most often seen in the endomyometrial junction region. They ideally are small <5 mm, however ma...
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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 appendix, some of which are peculiar to this site. Epidemiology Tumours involving the appendix have been found in only about 1% of all appendectomy 9. Epithelial neoplasms and neuroendocrine tumours represent the gross majority of the tumour...
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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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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 of 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: neurofibroma...
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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 follo...
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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 (NNSLP) are conditions which may mimic pancreatic neoplasms on imaging. They include: focal pancreatitis fatty infiltration-replacement intrapancreatic accessory spleen congenital anomalies, such as prominent pancreatic lobulations and bifid pancr...
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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 cell...
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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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Nuchal fold thickness

Nuchal fold thickness is a parameter that is measured in a second-trimester scan (at ~18-22 weeks) and should not be confused with nuchal translucency (which is measured in the first trimester). Pathology The proposed aetiology of increased nuchal thickness is the result of congenital heart di...
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Obesity

Obesity is defined as a body mass index (BMI) greater than 30. 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 world but...
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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 ...
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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 increasi...
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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 infection

Orbital infection is a relatively commonly encountered pathology. It comprises of three main clinical entities with the most important distinction between that of orbital and periorbital cellulitis: periorbital cellulitis (preseptal cellulitis) is limited to the soft tissues anterior to the or...
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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's disease of the skull, but may be observed in other circumstances as...
Article

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 ...
Article

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 ...
Article

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...
Article

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 sub-articles. 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...
Article

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...
Article

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...
Article

Paediatric curriculum

The paediatric curriculum is one of our curriculum articles and aims to be a collection of articles that represent the core paediatric knowledge. Definition Topics pertaining to paediatric radiology, including paediatric neuroradiology and fetal radiology, although there will be some cross cov...
Article

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...
Article

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...
Article

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 ...
Article

Pancreatic calcifications

Pancreatic calcifications can arise form many aetiologies. Punctate intraductal calcifications acute alcoholic pancreatitis (20-40%)  intraductal, numerous, small, irregular preponderant cause of diffuse pancreatic intraductal calcification chronic pancreatitis idiopathic: no underlying ca...
Article

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...
Article

Pancreatitis

Pancreatitis 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 pancreatitis haemorrhagic p...
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Pantaloon hernia

A pantaloon hernia (dual hernia or 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 ...

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