Items tagged “normal variant”
116 results found
Case
Chilaiditi sign
Published
14 Dec 2010
82% complete
X-ray
Case
Bipartite hallux sesamoid
Published
21 Feb 2011
85% complete
X-ray
Case
Low weight effect on mammogram
Published
27 Feb 2011
75% complete
Mammography
Case
Pes anserinus spur
Published
27 Apr 2011
54% complete
X-ray
Article
Anconeus epitrochlearis muscle
The anconeus epitrochlearis muscle is an accessory muscle of the upper limb at the medial aspect of the elbow. It is also known as the accessory anconeus muscle or epitrochleoanconeus muscle and should not be confused with the anconeus muscle which is present at the lateral aspect of the elbow. ...
Article
Junctional parenchymal defect of kidney
Junctional parenchymal defects in renal imaging are a normal variant, which results from the incomplete embryonic fusion of renunculi.
Radiographic features
Ultrasound
It can be seen as a triangular echogenic cortical defect, frequently seen in upper lobe parenchyma. The defect is the extensi...
Article
Arcuate foramen
The arcuate foramen (foramen arcuate atlantis, ponticulus posticus or posterior ponticle, or Kimerle anomaly) is a frequently encountered normal variant of the atlas and is easily appreciated on a lateral plain film of the craniocervical junction.
Epidemiology
Incidence is ~8% (range 1-15%) an...
Article
Accessory ossicles of the foot
Accessory ossicles of the feet are common developmental variants with almost 40 having been described. Some of the more common include 1-4:
os peroneum
os subfibulare
os subtibiale
os tibiale externum (accessory navicular)
os trigonum
os calcaneus secundaris
os calcanei accessorium 6
os ...
Case
Supracondylar spur
Published
29 Sep 2012
75% complete
X-ray
Case
Duplicated left renal vein
Published
20 Nov 2012
65% complete
CT
Case
Multipartite patella
Published
18 Dec 2012
85% complete
Annotated image
X-ray
Article
Multipartite patella
Multipartite patella is an uncommon congenital abnormality that represents normal variant pathology and is a result of a failure of ossification during development. It is most commonly diagnosed as an incidental finding.
Clinical presentation
The vast majority of multipartite patellae are asy...
Case
Coracoclavicular articulation
Published
03 Jan 2013
57% complete
X-ray
Case
Pseudoepiphysis of 2nd metacarpal base
Published
24 Jan 2013
82% complete
X-ray
Case
Cupped sternal articular surface of the clavicles
Published
13 Feb 2013
79% complete
X-ray
Case
Forked clavicle
Published
20 Feb 2013
85% complete
X-ray
Article
Os subtibiale
An os subtibiale is a rare, genuine accessory ossicle and normal variant related to the posterior colliculus of the medial malleolus 1. It is present in ~1% of the population 5.
Clinical presentation
They usually are asymptomatic although they may eventually cause painful syndromes or degener...
Article
Fabella
The fabella (plural fabellae 5) is an accessory ossicle that is almost always found in the lateral head of the gastrocnemius although rarely it can occur in the medial head of gastrocnemius 4. It occurs in ~20% (range 10-30%) of the population 1.
The fabella can also be fibrocartilaginous in n...
Case
Bipartite patella
Published
03 Jan 2016
75% complete
X-ray
Article
Accessory superior acetabular notch
An accessory superior acetabular notch is a normal variant of the acetabulum, which can be seen on radiographs. It may lead to diagnostic confusion, especially in younger patients.
Radiographic features
MRI
appear as bilateral symmetric fluid-filled pits in the roof of the acetabulum with sh...
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