Items tagged “anatomical variant”

66 results
Article

5th metacarpal pit

The 5th metacarpal pit refers to the normal exaggeration of the pit-like depression in the head of fifth metacarpal 1.  Differential diagnosis It should not be mistaken for a boxer fracture (old or new) or an erosion.
Article

Azygos lobe

An azygos lobe is a normal variant that develops when a laterally displaced azygos vein creates a deep pleural fissure into the apical segment of the right upper lobe during embryological development. It is not a true accessory lobe as it does not have its own bronchus or corresponding specific ...
Article

Concha bullosa

Concha bullosa (plural: conchae bullosae) (also known as middle turbinate pneumatization) is a common finding and although associated with deviation of the nasal septum, it is usually of little clinical importance. Epidemiology Concha bullosa is a normal variant and is one of the most common v...
Article

Os acromiale

Os acromiale is an anatomical variant and represents an unfused accessory center of ossification of the acromion of the scapula. Epidemiology Os acromiale is relatively common, seen in ~8% (range 1-15%) of the population 1,2 and can be bilateral in 60% of individuals 5. Clinical presentation ...
Case

Retroaortic left renal vein (MRI)

  Diagnosis certain
Frank Gaillard
Published 15 May 2008
83% complete
MRI
Article

Bifid median nerve

A bifid median nerve is an uncommon anatomical variation in the forearm and has an increased association with a persistent median artery 4. Epidemiology It has an incidence of 9-19% 4. A persistent median artery is present in approximately half of those with a bifid median nerve 4. Gross anat...
Case

Accessory fissure - right lower lobe

  Diagnosis certain
Frank Gaillard
Published 24 Dec 2009
65% complete
CT
Case

Os acromiale with impingement

  Diagnosis certain
Andrew Dixon
Published 12 Apr 2010
87% complete
MRI X-ray
Article

Popliteal artery entrapment syndrome

Popliteal artery entrapment syndrome refers to symptomatic compression or occlusion of the popliteal artery due to a developmentally abnormal positioning of the popliteal artery in relation to its surrounding structures such as with the medial head of gastrocnemius or less commonly with popliteu...
Case

Popliteal artery entrapment syndrome

  Diagnosis certain
Andrew Dixon
Published 15 Apr 2010
92% complete
MRI
Article

Extensor digitorum brevis manus muscle

The extensor digitorum brevis manus (EDBM) muscle is an accessory muscle in the hand and is a normal anatomical variant.  Summary origin: distal radius and posterior radiocarpal ligament insertion: extensor hood of 2nd or 3rd digits (variable) innervation: posterior interosseous nerve actio...
Case

Branchial cleft cyst

  Diagnosis probable
Paul Smith
Published 07 Oct 2010
47% complete
Ultrasound
Case

Anomalous right coronary artery (ARCA) with interarterial course

  Diagnosis certain
Erik Ranschaert
Published 23 Nov 2010
92% complete
CT
Article

Anomalous pancreaticobiliary junction

Anomalous pancreaticobiliary junction, also known as pancreaticobiliary maljunction, describes the abnormal junction of the pancreatic duct and common bile duct that occurs outside the duodenal wall to form a long common channel. Epidemiology The incidence varies from 1.5% to 3.2% 11. The esti...
Case

Retroaortic left renal vein

  Diagnosis certain
Roberto Schubert
Published 03 Jul 2011
77% complete
CT
Case

Cervical rib

  Diagnosis probable
Roberto Schubert
Published 04 Jul 2011
45% complete
CT
Case

Aberrant right subclavian artery (CTA)

  Diagnosis certain
Frank Gaillard
Published 20 Jul 2011
74% complete
CT
Case

Supernumerary toe

  Diagnosis certain
Alexandra Stanislavsky
Published 08 Mar 2012
57% complete
X-ray
Article

Ostiomeatal complex narrowing due to anatomical variations

Some ostiomeatal complex anatomical variations, which do not cause disease by themselves, can promote narrowing and even obstruction 1: concha bullosa ~10% (range 4-15%) - aerated middle turbinate intralamellar cell: air cell within vertical portion of the middle turbinate  oversized ethmoid ...
Case

Fabella

  Diagnosis certain
Henry Knipe
Published 13 Mar 2013
82% complete
X-ray

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