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.

469 results found
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F. P. Weber syndrome

F. P. Weber syndrome (FPWS) is a traditional eponymous denomination of a certain type of angiodysplasia, that would nowadays rather be called a mixed haemolymphatic congenital vascular malformation (CVM) with arteriovenous (av) shunting, based on the Hamburg classification of CVMs. In his origi...
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Fabella

The fabella is an accessory ossicle typically found in the lateral head of the gastrocnemius. It occurs in ~20% (range 10-30%) of the population 1.  The fabella can also be fibrocartilaginous in nature and is occasionally found in the medial head of the gastrocnemius. The fabella articulates wi...
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Fabry disease

Fabry disease is a multisystem disorder which results from an X-linked inborn error of metabolism. The disease is characterised by a deficiency in hydrolase alpha-galactosidase activity with resultant abnormal accumulation of globotriaosylceramide (Gb3) in various organ systems. In men, the cond...
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Faceless kidney

A faceless kidney refers to one in which the normal appearance of the renal sinus on cross-sectional imaging is absent. It was initially described as a sign of duplication of the collecting system 1 (a slice obtained between the two collecting systems will not demonstrate the normal components o...
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Facet dislocation

Facet dislocation refers to anterior displacement of one vertebral body on another. Without a fracture, the only way anterior displacement can occur is by dislocation of the facets.  Facet dislocation can occur to varying degrees: subluxed facets perched facets locked facets The injury usua...
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Facet joint

The facet (or apophyseal or zygapophyseal) joints are the articulations of the posterior arch of the vertebrae and form part of the posterior column.  Gross anatomy They are synovial-lined joints that have a fibrous capsule and connect the articular facets of the vertebrae. The superior facet ...
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Facet joint capsule

Facet joint capsules are the fibrous capsule that surround the vertebral facet or zygapophyseal joints. They are particularly thin and loose, attached to the margins of articular facets on adjoining articular processes. The capsules merge medially with the ligamentum flavum.  In the cervical re...
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Facet joint injection

Facet (zygapophyseal) joint injections are one of the most frequently performed spinal interventional procedures, as both treatment for and diagnosis of radicular pain syndrome and facet syndrome. It can be performed under fluoroscopic, or CT image guidance and cervical, thoracic or most commonl...
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Facial angiofibroma

Facial angiofibroma, also known as fibrous papule, is a fairly common skin lesion seen in males and females after puberty. Pathology They represents a focal vascular and collagen growth. This lesion is usually solitary and located on the nose skin, measuring 1-5 mm.  There is no hereditary p...
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Facial artery

The facial artery is one of the branches of the external carotid artery and supplies blood to the structures of the face. Summary origin - branch of the external carotid artery a little above the level of the lingual course - ascends anteriorly through the cheek with a tortuous route towards ...
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Facial bones

The facial bones comprise a set of bones that make up the face: midline single sphenoid bone ethmoid bone vomer mandible ​paired bilateral palatine bone nasal bone lacrimal bone inferior nasal concha zygoma (zygomatic bone) maxilla Where these bones join each other, sutures occur.
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Facial clefts

Facial clefts comprise of a wide spectrum of pathologies which result from failure of fusion in the facial region during the embryonic - early fetal period. This results is gap in the fetal face. These clefts can affect the lip, philtrum, alveolus and hard and soft palate to varying degrees.  E...
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Facial colliculus

The facial colliculus is an elevation on the floor of the fourth ventricle and is not formed by the facial nerve nucleus, but by the fibres of the facial nerve arching backwards around the abducens nerve (CN VI) nucleus before turning forwards once more in caudal pons. Related pathology A lesi...
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Facial colliculus syndrome

Facial colliculus syndrome refers to a constellation of neurological signs due to a lesion at the facial colliculus, involving: abducens nerve (CN VI) nucleus facial nerve (CN VII) fibres at the genu medial longitudinal fasciculus Clinical presentation lower motor neuron facial nerve palsy ...
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Facial fractures

Facial fractures are commonly caused by blunt or penetrating trauma sustained during motor vehicle accidents, assaults, and falls. The facial bones are thin and light making them susceptible to injury. Epidemiology Males are affected more commonly than females and facial fractures are most com...
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Facial muscles

The facial muscles enable facial expression and serve as sphincters and dilators of the orifices of the face. These muscles differ from those of other regions in the body as there is no deep fascia deep to the skin of the face; many of the facial muscles insert directly into the skin of the face...
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Facial nerve

The facial nerve is one of the key cranial nerves  with a complex range of functions. Although at first glance it is a motor nerve to facial expression, which begins as a trunk and emerges from the parotid gland as five branches (see facial nerve branches mnemonic here), it has taste and parasy...
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Facial nerve branches (mnemonic)

There are many mnemonics to recall the branches of the facial nerve (superior to inferior) as they exit the anterior border of the parotid gland. Examples include: Tall Zulus Bear Many Children Two Zulus Bit My Cat Two Zebras Bit My Coccyx Ten Zebras Buggered My Car To Zanzibar By Motor Car...
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Facial nerve choristoma

Facial nerve choristomas are rare, being characterised by non-neoplastic proliferation of smooth muscle cells and fibrous tissue. Facial nerve choristomas presumably can occur anywhere along the course of the facial nerve (CN VII), although the only cases reported are in the internal acoustic me...
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Facial nerve schwannoma

Facial nerve schwannoma (FNS), also known as facial nerve neuroma/neurilemoma, is a schwannoma that arises from the facial nerve. They are generally uncommon, and when involving the temporal bone, make up less than 1% of all temporal bone tumours. Epidemiology FNS is a rare tumour 2. Clinical...
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Facial nerve segments (mnemonic)

A helpful mnemonic for remembering the segments of the facial nerve is: I Love Going To Makeover Parties 1 I Love Grinning, Then Making Pouts both grinning and pouting are performed by muscles which are innervated by the facial nerve Mnemonic I: intracranial (cisternal)/intracanalicular L:...
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Facial palsy

Facial palsy refers to the neurological syndrome of facial paralysis. It can result from a broad range of of physiological insult to the facial nerve or its central nervous system origins. The most common causes of this is Bell palsy.  Terminology While facial palsy refers to the clinical pres...
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Factitious hyperthyroidism

Factitious hyperthyroidism or thyrotoxicosis factitia refers to precipitation of thyrotoxicosis due to exogenous ingestion of thyroid hormone (e.g. levothyroxine). It has been rarely associated with myocardial ischaemia 2. Radiographic features Ultrasound The hypervascularity which is seen wi...
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Faecaloma

A faecaloma is a mass of faeces most frequently noted in the rectum and sigmoid colon, that is much harder than a faecal impaction due to coprostasis. Pathology Usually, the faecal matter accumulates in the intestine, then stagnates and increases in volume until the intestine becomes deformed ...
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Fahr disease

Fahr disease, also known as familial cerebral ferrocalcinosis, is a congenital disorder characterised by abnormal calcium deposition with subsequent atrophy involving the basal ganglia, cerebral and cerebellar cortical regions. Both autosomal dominant and autosomal recessive inheritance patterns...
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Failed back syndrome

Failed back syndrome refers to persistent leg and/or lumbar back pain after a surgical procedure. The pathophysiology of this syndrome is complex, as often the operation was technically successful.  Terminology Other names for failed back syndrome include failed back surgery syndrome, post-lam...
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Failed early pregnancy

Failed early pregnancy refers to the death of the embryo and therefore, miscarriage. The most common cause of embryonic death is a chromosomal abnormality. Radiographic assessment Ultrasound Findings diagnostic of pregnancy failure crown-rump length (CRL) of ≥7 mm and no heartbeat on a trans...
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Failed pregnancy

Failed pregnancy is a pregnancy that will not carry through to term. It is termed a miscarriage or failed early pregnancy when fetal demise occurs before 20 weeks gestational age and fetal death in utero (FDIU) when it occurs after 20 weeks gestation. Practical points The term "non-viabl...
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Falciform crescent

The falciform crescent is a horizontal ridge that divides the internal acoustic meatus into superior and inferior portions. Superior The facial nerve and superior vestibular nerve (SVN) travel in the superior portion of the IAM with the facial nerve
 anterior to the SVN and separated from ...
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Falciform ligament

The falciform ligament is a broad and thin peritoneal ligament. It is sickle-shaped (Latin: "falciform") and a remnant of the ventral mesentery of the fetus. It is situated in an anteroposterior plane, but lies obliquely so that one surface faces forward and is in contact with the per...
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Falciform ligament sign

The falciform ligament sign (also called the Silver's sign) is a sign seen with a pneumoperitoneum. It is almost never seen in isolation. If there is enough free air to outline the falciform ligament, there is usually enough air to also provide at least a Rigler's sign.  The falciform ligamen...
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Fall onto an outstretched hand

Fall onto an outstretched hand (FOOSH) is a common mechanism for distal radial injuries. Some injuries that result from such a fall include: Colles fracture Smith fracture scaphoid fracture See also distal radial fractures
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Fallen fragment sign

The fallen fragment sign refers to the presence of a bone fracture fragment resting dependently in a cystic bone lesion. This finding is said to be pathognomonic for a simple (unicameral) bone cyst following a pathological fracture. The finding exists because a simple bone cyst is fluid filled,...
Article

Fallen lung sign

The fallen lung sign (also known as CT fallen lung sign) describes the appearance of collapsed lung away from the mediastinum encountered with tracheobronchial injury (in particular those > 2 cm away from the carina). It is helpful to look for this rare but specific sign, in cases of unexplai...
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Fallopian canal

The Fallopian (facial) canal refers to a bony canal through which the facial nerve traverses the petrous temporal bone, from the internal acoustic meatus to the stylomastoid foramen. It is, for those of you fond of trivia, the longest bony canal through which a nerve passes. It is also responsi...
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Fallopian tubal rupture

Fallopian tube rupture is most often a complication of a tubal ectopic pregnancy where the pregnancy breaks open due to progressive growth. It can potentially lead to shock. Pathology Risk factors Factors that raise the risk for a tubal rupture in a given tubal ectopic pregnancy include 2-4: ...
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Fallopian tube polyp

A Fallopian tube polyp refers to a small focal lesion of ectopic endometrial tissue located at the intramural portion of the fallopian tube.  Epidemiology The reported incidence is 1- 2.5% on hysterosalpingograms performed for assessment of infertility 3 Clinical presnetation Most patients w...
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Fallopian tube spasm

Fallopian tube spasm is a transient functional anomaly that can mimic a true mechanical tubal occlusion. At radiography, tubal spasm cannot be distinguished from a tubal occlusion. Administration of spasmolytic agents such as Glucagon can occasionally result in uterine muscle relaxation and cons...
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Fallopian tube torsion

Fallopian tube torsion is a type of adnexal torsion and usually occurs in association with an ovarian torsion (when it is then termed a tubo-ovarian torsion). An isolated fallopian tube torsion is rare but can occur.  Pathology An isolated tubal torsion can occur as a late complication of tuba...
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False aneurysm

False aneurysms, also known as a pseudoaneurysm, is when there is a breach in the vessel wall such that blood leaks through the wall but is contained by the adventitia or surrounding perivascular soft tissue. A direct communication of blood flow exists between the vessel lumen and the aneurysm l...
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False umbilical cord knot

False umbilical cord knots are commonly formed variants in the umbilical cord anatomy. It basically represents, exaggerated looping of the umbilical cord vessels, causing focal dilatation of the umbilical cord vessels. Radiographic features Ultrasound bulge or protruberance in the umbilical c...
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Falx cerebelli

The falx cerebelli is a small infolding of the dura in the sagittal plane over the floor of the posterior cranial fossa. It partially separates the two cerebellar hemispheres 1. Gross Anatomy The falx cerebelli is attached posteriorly in the midline to the internal occipital crest of the occip...
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Falx cerebri

The falx cerebri is the largest of the four main folds (or septa) of the intracranial dura mater, separating the cerebral hemispheres 1.  Gross anatomy The falx cerebri is a double-fold of dura mater that descends through the interhemispheric fissure in the midline of the brain to separate the...
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Falx ossification

In discussing mineralisation of the falx cerebri, many radiology textbooks use the term falx calcification and make no mention of falx ossification.  Epidemiology Ossification of dural folds is very rare and falx ossification is seen in 0.7% of patients 1. Even though, ossification of an isola...
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Familial adenomatous polyposis syndrome

Familial adenomatous polyposis syndrome (FAPS) is characterised by the presence of hundreds of adenomatous polyps in the colon. It is the most common of the polyposis syndromes. Terminology Familial polyposis coli, attenuated familial adenomatous polyposis and Gardner syndrome are all variants...
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Familial multiple cavernous malformation syndrome

Familial multiple cavernous malformation syndrome(s) are uncommon, accounting for only a minority of cavernous malformations. Epidemiology It has been more frequently reported in patients of Hispanic descent 1. Clinical presentation The presentation is most commonly with seizures (38-55%) 1 ...
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Familial multiple lipomatosis

Familial multiple lipomatosis (FML) is a hereditary syndrome of multiple encapsulated lipomas which are found on the trunk and extremities, with relative sparing of the head and shoulders.  Inheritance is frequently by autosomal dominant transmission, although cases with recessive inheritance h...
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Fanconi anaemia

Fanconi anaemia (FA) is a rare disorder characterised by progressive bone marrow failure, various congenital abnormalities, and predisposition to malignancies (often acute myeloid leukaemia). It is considered the commonest type of inherited marrow failure syndrome 7.  Terminology Fanconi anaem...
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Fascial tail sign

The fascial tail sign is the linear extension along the fascia/muscular aponeurosis from a deeper tumor. Radiographic features It appears as a tail and is best appreciated on MRI, classically seen in desmoid tumours as T2 hypointense bands that progressively enhance particularly on delayed pha...
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Fascicular sign

Fascicular sign is a finding on T2-weighted MRI images that suggests a lesion of neurogenic origin. It is characterised by multiple small ring-like structures with peripheral hyperintensity representing the fascicular bundles within the nerves. It is found in various neurogenic tumours, includi...
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Fat containing breast lesions

Fat containing breast lesions generally have some radiolucent component on mammography. Pathology They are generally classified at BIRADS II lesions. Common breast lipoma breast hamartoma fat necrosis within the breast/oil cyst intramammary lymph node: classically has a central fatty hilu...
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Fat containing liver lesions

A variety of benign and malignant liver lesions may contain macroscopic and or intracytoplasmic fat in sufficient quantities enabling characterization on imaging studies. Most fat containing liver lesions (80%) in patients with cirrhosis are malignant, most of which are hepatocellular carcinoma ...
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Fat containing renal lesions

There are many renal masses which can contain macroscopic fat, including renal angiomyolipoma renal cell carcinoma Wilms tumour renal oncocytoma renal or perirenal lipoma Non-mass lesions may also occasionally contain fat renal junction line fat in a renal scar renal sinus lipomatosis ...
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Fat containing solitary pulmonary nodule

The differential of a fat containing solitary pulmonary nodule is very narrow. In a well circumscribed smooth or lobulated mass (especially if it has been largely stable in size over time) presence of fat is essentially pathognomonic of a pulmonary hamartoma, and usually not further assessment ...
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Fat containing thoracic lesions

There is a long list of fat containing thoracic lesions. They may involve the mediastinum, lung, pleura or chest wall. Differential diagnosis includes:  intrapulmonary: fat containing pulmonary lesions pulmonary hamartoma endobronchial lipoma intrapulmonary lipoma lipoid pneumonia myeloli...
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Fat embolism syndrome

Fat embolism syndrome (FES) is a rare clinical condition caused by circulating fat emboli leading to a multisystemic dysfunction. The classical clinical triad consists of: respiratory distress cerebral abnormalities petechial haemorrhages Epidemiology It occurs in ~2.5% (range 0.5-4%) of th...
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Fat halo sign of inflammatory bowel disease

The fat halo sign refers to a feature seen on CT examination of the abdomen, and represents infiltration of the submucosa with fat, between the muscularis propria and the mucosa. It is characterised by an inner (mucosa) and outer (muscularis propria and serosa) ring of enhancing bowel wall along...
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Fat necrosis of the breast

Fat necrosis within the breast is a pathological process that occurs when there is saponification of local fat. It is a benign inflammatory process and is becoming increasingly common with greater use of breast conserving surgery and mammoplasty procedures. Epidemiology Most at risk are middle...
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Fat pad impingement syndromes of the knee

In fat-pad impingement syndromes the aetiologies are different for each knee fat pad. In anterior suprapatellar fat pad impingment syndrome the cause is usually due to either a developmental cause related to the anatomy of the extensor mechanism, or may be related to abnormal mechanics. In this...
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Fat redistribution syndrome

The fat redistribution syndrome (or HIV lipodystrophy syndrome) is seen in a number of AIDS patients on HAART. It is characterised by typical changes in body fat distribution. Features include : hypertrophy in the neck fat pad (buffalo hump) increased fat in the abdominal region (protease pau...
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Fat ring sign

The fat ring sign (also known as a  fat halo sign) describes preservation of fat around the mesenteric vessels and around soft tissue nodules on back ground of diffuse fat stranding in patients with mesenteric panniculitis or mesenteric lipomas.  This finding may help distinguish mesenteric pan...
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Fat stranding on CT

Fat stranding is a common sign on CT seen anywhere fat can be found but is most commonly seen in the abdomen/pelvis, but also in the retroperitoneum, thorax and subcutaneous tissues. It can be helpful in localising both acute and chronic pathology. Radiographic features CT Fat stranding can a...
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Fat suppressed imaging

Fat suppression is commonly used in magnetic resonance (MR) imaging to suppress the signal from adipose tissue or detect adipose tissue 1. It can be applied to both T1 and T2 weighted sequences.  Due to short relaxation times, fat has a high signal on magnetic resonance images (MRI). This high ...
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Fat-stranding (summary)

Fat stranding is a sign that is seen on CT. It describes the change in attenuation of fat around an inflamed structure and is a very helpful signpost for intra-abdominal pathology. Summary relatively high sensitivity for intra-abdominal inflammatory pathology many inflammatory processes will ...
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Fatco syndrome

Fatco syndrome is a syndrome consisting of fibular aplasia tibial campomelia and oligosyndactyly. It is a syndrome of unknown genetic basis and inheritance with variable expressivity and penetrance. Differential diagnosis Fuhrmann syndrome and Al-Awadi syndrome are said to be similar to FA...
Article

Fatigue fracture

Fatigue fractures are a type of stress fracture, and are due to abnormal stresses on normal bone. They should not be confused with an insufficiency fracture, which occurs due to normal stresses on abnormal bone. Plain films typically demonstrate a linear sclerotic region. MRI is the most sensiti...
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Fatty falx cerebri

A fatty falx cerebri is a common finding, seen (according to one study) 7.3% of patients, and is explained by fat being a normal feature of the extradural neural axis compartment located between the two visceral layers of the falx.  A fatty falx is an incidental finding and should not be mistak...
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Fatty mediastinal masses (differential diagnosis)

Fatty mediastinal masses are relatively uncommon, and the differential diagnosis is brief, including 1-4: lipoma liposarcoma thymolipoma benign mature teratoma lipoblastoma extravasation of lipid-rich hyperalimentation fluid 3 fibrofatty replacement of the central portion of mediastinal l...
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Fatty nodal metaplasia

Fatty nodal metaplasia in the neck occurs as a result of chronic inflammation or radiotherapy 3. The normal fatty nodal hilum enlarges, such that the lymph node appears cystic. However, its center is of fatty density. There is no surrounding stranding, and the node otherwise looks normal. Diffe...
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Fazekas scale for white matter lesions

The Fazekas scale is used to simply quantify the amount of white matter T2 hyperintense lesions usually attributed to chronic small vessel ischaemia, although clearly not all such lesions are due to this. This classification was proposed by Fazekas et al. in 1987 1 and at the time or writing (l...
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FBI sign

The FBI sign is an acronym referring to the components that form a lipohaemarthrosis. It stands for: 
 fat 
 
 blood 
 
 interface 
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FCD (disambiguation)

FCD may refer to: focal cortical dysplasia (of the brain) fibrous cortical defect (of the bone)
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Features of a Charcot joint (mnemonic)

The radiographic features of a Charcot joint can be remembered by using the following mnemonic: 6 Ds of Charcot joint Mnemonic increased density (subchondral sclerosis) destruction debris (intra-articular loose bodies) dislocation distention disorganisation The causes of Charcot arthrop...
Article

Febrile infection-related epilepsy syndrome

Febrile infection-related epilepsy syndrome (FIRES) is a severe post infectious neurological disorder that presents with status epilepticus in a previously normal child (or less commonly adult) after a febrile illness. Terminology FIRES has received several names in the literature: acute ence...
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Feeding vessel sign

Feeding vessel sign consists of a distinct vessel leading directly to a nodule or a mass. This sign indicates either that the lesion has a hematogenous origin or that the disease process occurs near small pulmonary vessels.  A number of vessel-related non-neoplastic disorders of the lung produc...
Article

Feingold syndrome

Feingold syndrome is characterised by the combination of: microcephaly
 
 digital abnormalities 
 alimentary tract atresias especially oesophageal atresia
 
Article

Feline oesophagus

Feline oesophagus also known as oesophageal shiver, refers to the transient transverse bands seen in the mid and lower oesophagus on a double contrast barium swallow. The appearance is almost always associated with active gastro-oesophageal reflux 2,3 and is thought to be due to contraction of ...
Article

Felty syndrome

Felty syndrome comprises of the combination of: rheumatoid arthritis (RA) splenomegaly and neutropaenia It is thought to occur in ~ 1% of patients with rheumatoid arthritis 2. History and etymology Named after Augustus Roi Felty: American (US) physician (1895 -1964) 1
Article

Female infertility

Female infertility is common, and can be due to a number of factors. Radiology often plays a key part of the work-up.  Pathology Aetiology Often more than one factor (including male infertility) is the cause of infertility, some of the common causes are listed below 1-3: age > 35 years i...
Article

Female prostate sign

Female prostate sign is a characteristic imaging sign seen in patients with a large urethral diverticulum.  A large urethral diverticulum in females surrounds the urethra, and elevates the base of the bladder, mimicking the typical appearance of enlarged prostate in males. 
Article

Female pseudohermaphroditism

Female pseudohermaphroditism (FPH) is a form of disorder of gender development.  Pathology Patients with female pseudohermaphroditism have female internal genitalia and female karyotype (XX) with various degree of external genitalia virilization. Causes  congenital adrenal hyperplasia (CAH) ...
Article

Female reproductive system

The female reproductive system (or tract) comprises of the vagina, uterus, uterine tubes and ovaries. It can be imaged using almost the entire range of modalities but ultrasound and MRI are most useful. 
Article

Female urethra

The female urethra is a simple tube that extends from the internal urethral orifice of the bladder to the external urethral orifice in the vestibule of the vagina.  Gross anatomy The female urethra measures approximately 4 cm in length. It is embedded in the anterior vaginal wall and runs with...
Article

Femoral anteversion

Femoral anteversion refers to the orientation of the femoral neck in relation to the femoral condyles at the level of the knee. In most cases, the femoral neck is oriented anteriorly as compared to the femoral condyles. In the case of posterior orientation, the term femoral retroversion is also ...
Article

Femoral artery pseudoaneurysm

Femoral artery pseudoaneurysms are usually iatrogenic as the femoral artery is the vessel of choice for most endovascular arterial interventions. Pathology Aetiology iatrogenic anticoagulation therapy inadequate compression following endovascular intervention improper arterial puncture tec...
Article

Femoral canal

The femoral canal, or the medial compartment of the femoral sheath, is the inverted cone-shaped fascial space medial to the femoral vein within the upper femoral triangle. It is only 1-2 cm long and opens superiorly as the femoral ring. It serves two purposes: allows the femoral vein to expand ...
Article

Femoral hernia

A femoral hernia is a type of groin herniation and comprises of a protrusion of a peritoneal sac through the femoral ring into the femoral canal, posterior and inferior to the inguinal ligament. The sac may contain preperitoneal fat, omentum, small bowel, or other structures. Epidemiology Ther...
Article

Femoral neck fracture

Neck of femur fractures (NOF) are common injuries sustained by older patients who are both more likely to have unsteadiness of gait and reduced bone mineral density, predisposing to fracture. Elderly osteoporotic women are at greatest risk. Epidemiology It is anticipated that the total number ...
Article

Femoral nerve

The femoral nerve is a large nerve arising from the lumbar plexus and one of two major nerves supplying the lower limb. Gross anatomy Origin It arises from posterior divisions of L2-L4 roots of the lumbar plexus. Course emerges from the lateral border of the psoas muscle to descend between ...
Article

Femoral nerve neuropathy

Femoral nerve neuropathy occurs when the femoral nerve is compressed as it passes under the inguinal ligament, anterior to iliopsoas. Causes include surgery (hysterectomy, pelvic, hip, femoral artery catheterization, arterial bypass). Mass effect from iliacus or iliopsoas may be visualised and...
Article

Femoral ring

The femoral ring is the superior opening of the femoral canal. It boundaries are: medial: lacunar ligament anterior: medial part of the inguinal ligament lateral: femoral vein within the intermediate compartment of the femoral sheath posterior: pectineal ligament overlying the pectineus and ...
Article

Femoral sheath

The femoral sheath is the funnel-shaped fascial space that extends from the abdomen, inferior to the inguinal ligament, into the femoral triangle. It has variable length and terminates by blending in with the adventitia of the femoral vessels. It is formed from the transversalis and psoas fascia...
Article

Femoral torsion analysis

Femoral torsion analysis is used to assess the alignment of a femur post surgery. If one side has been operated on it can be compared to the non-operated side. Method žSuperimpose axial images of: —femoral heads —beck of femurs —femoral condyles žDraw a line from the centre of the femoral ...

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