Items tagged “stub”

1,307 results found
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5th metacarpal pit

The 5th metacarpal pit refers to the normal exaggeration of the pit-like depression in the head of fifth metacarpal.  Differential diagnosis It should not be mistaken for a boxer fracture (old or new) or an erosion.
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Accessory right inferior hepatic vein

An accessory right inferior hepatic vein is the most common variation of the hepatic veins. It is present in up to 48% of the population and drains the posterior part of the right lobe (mainly segments 6 and 7) directly into the inferior vena cava (IVC). Variations in hepatic vascular anatomy a...
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Acromioclavicular joint configuration

There is much variation in acromioclavicular joint configuration, which may be confused with pathology. The relationship of the acromion to the distal clavicle at the AC joint can be described in the coronal plane as 1-3: horizontal: normal low-lying: associated with shoulder impingement (unfo...
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Ameloblastic fibroma

Ameloblastic fibromas appear as unilocular lucent mandibular lesions, most frequently in the posterior mandible, and are usually associated with impacted teeth, centered on the unerupted crown. They, therefore, appear very similar to unilocular ameloblastomas. They are composed of enamel and emb...
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Anterior shoulder capsular insertion

The anterior capsular insertion, unlike the posterior aspect of the shoulder joint capsule which has a constant scapular attachment along the margins of the glenoid labrum, inserts a variable distance from the labrum. The capsular insertions are classified as follows: type I: at or very near t...
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Apple-peel intestinal atresia

Apple-peel intestinal atresia, also known as type IIIb or Christmas tree intestinal atresia, is a rare form of small bowel atresia in which the duodenum or proximal jejunum ends in a blind pouch and the distal small bowel wraps around its vascular supply in a spiral resembling an apple peel. Oft...
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Banana sign (cerebellum)

The banana sign is one of the many notable fruit inspired signs. This sign is seen on axial imaging through the posterior fossa of fetuses with associated conditions such as  Chiari II malformation and/or spina bifida. In Chiari II malformation, the banana sign describes the way the cerebellum...
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Bright rim sign (DNET)

The bright rim sign, also known as the hyperintense ring sign, has been described in dysembryoplastic neuroepithelial tumors (DNET). It is described as a well-defined rim of high signal around the DNET on FLAIR sequences. This T2/FLAIR hyperintense ring, whether complete or incomplete, is fairl...
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Central bronchiectasis

Distribution of bronchiectasis can help in narrowing the differential diagnosis. Central bronchiectasis is typically seen in: allergic bronchopulmonary aspergillosis (ABPA) congenital tracheobronchomegaly (a.k.a. Mounier Kuhn syndrome) cystic fibrosis Williams Campbell syndrome (rare) See a...
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Cerebral edema

Cerebral edema refers to a number of interconnected processes which result in abnormal shifts of water in various compartments of the brain parenchyma. It is observed in the majority of injuries involving the central nervous system 5. It has traditionally been broadly divided into vasogenic cer...
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Chemotherapy induced cholangitis

Chemotherapy induced cholangitis is caused when intra-arterial chemotherapy is introduced to treat liver metastases. This causes strictures of the common hepatic duct and main ducts, but spares distal and proximal (i.e. common bile duct and intrahepatic ducts).  Radiographic features similar t...
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Coalescent mastoiditis

Coalescent mastoiditis is simply the term given to acute otomastoiditis when mucoperiosteal disease extends to involve the bone. The septae which normally separate one mastoid air cell from another are resorbed. This change is only easily appreciated on thin section bone-algorithm through the te...
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Colonic stricture

Colonic strictures can be long (>10 cm) or short. Short scirrhous colorectal carcinoma (apple core sign) post surgical (anastamotic stricture) Long malignancy scirrhous colorectal carcinoma gastrointestinal lymphoma inflammatory bowel disease ulcerative colitis Crohn disease post radi...
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Congenital vascular anomalies

Congenital vascular anomalies form a subgroup of vascular anomalies present at birth. They comprise both vascular tumors and vascular malformations. Based on the ISSVA classification of vascular anomalies 1 here is a non-comprehensive list with examples of vascular anomalies that are usually co...
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Cowdry bodies

Cowdry bodies are eosinophilic or basophilic neuronal intranuclear inclusions composed of nucleic acid and protein, this cytopathic changes are considered a hallmark of viral infection.1. Pathology Cowdry bodies are in fact fixation artifacts and not directly the result of the intracellular vi...
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Cystic mediastinal masses

The differential diagnosis for cystic masses of the mediastinum include: foregut duplication cysts bronchogenic cyst esophageal duplication cyst neuroenteric cyst pericardial cyst meningocele lymphangioma thymic cyst cystic teratoma of mediastinum cystic degeneration of an intrathoraci...
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Dagger sign (spine)

The dagger sign is a radiographic feature seen in ankylosing spondylitis as a single central radiodense line on frontal radiographs related to ossification of the supraspinous and interspinous ligaments secondary to enthesitis 2. It is possible for the radiodense line to extent into the sacrum 3. 
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Denervation changes in muscles

Denervation changes in muscles or denervation myopathy can be observed in a number of settings and results from partial or complete loss of innervation. There is a wide spectrum of clinical manifestations: temporary or permanent symptomatic or asymptomatic. Pathology Causes include 2: neur...
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Double line sign

The double line sign is a pathognomonic MRI finding seen at the periphery of a region of osteonecrosis (avascular necrosis, bone infarct), representing the border between the viable and non-viable bone 4. It is best seen on T2 and T2 FS sequences and consists of two serpentine lines: an inner br...
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Empty gestational sac

Empty gestational sacs can be due to a number of causes: anembryonic pregnancy (also known as "blighted ovum") early pregnancy (intrauterine): by 5.5 weeks gestational age, a yolk sac should be identifiable by transvaginal ultrasound pseudogestational sac with an ectopic pregnancy gestationa...

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