Items tagged “variant”
426 results found
Article
Duplication of inferior vena cava
Duplication of the inferior vena cava is a relatively rare but well described vascular anomaly. This caval abnormality had an increased association with renal anomalies like crossed fused ectopia or circumaortic renal collar 1,2.
Epidemiology
The incidence of inferior vena cava duplication is ...
Case
Azygos lobe
Published
05 Sep 2012
82% complete
X-ray
Article
Accessory ossicle of the anterior arch of the atlas
The accessory ossicle of the anterior arch of the atlas is a normal variant and is best appreciated on a lateral cervical/sagittal study. It is observed as a circular and corticated osseous density that articulates with the inferior aspect of the anterior arch of the atlas.
It is not associate...
Article
Metopic suture
The metopic suture (also known as the frontal, interfrontal, or median frontal suture) is a vertical fibrous joint that divides the two halves of the frontal bone and is present in a newborn.
Persistent metopic sutures can be misdiagnosed as vertical skull fractures, therefore it is important t...
Case
Duplex collecting system
Published
02 Nov 2012
63% complete
Ultrasound
Case
Arcuate foramen
Published
13 Nov 2012
82% complete
X-ray
Article
Partial anomalous pulmonary venous return
Partial anomalous pulmonary venous return (PAPVR), also known as partial anomalous pulmonary venous connection (PAPVC), is a rare congenital cardiovascular condition in which some of the pulmonary veins, but not all, drain into the systemic circulation rather than in the left atrium.
Epidemiolo...
Article
Sprengel deformity
Sprengel deformity, or congenital elevation of the scapula, is a complex deformity of the shoulder and is the most common congenital shoulder abnormality. An initial diagnosis can often be made on radiographs, but CT or MRI is often necessary to evaluate the details of the abnormality.
Epidemio...
Article
Foramen tympanicum
The foramen tympanicum (plural: foramina tympanica), also known as foramen of Huschke, is an anatomical variation in the external acoustic canal (EAC), where a bony defect connects the EAC to the temporomandibular joint (TMJ).
Epidemiology
Various studies have reported on the occurrence of a f...
Case
Double inferior vena cava
Published
08 Jan 2013
92% complete
CT
Case
Supracondylar spur
Published
15 Jan 2013
66% complete
X-ray
Case
Unfused anterior and posterior arches of C1
Published
23 Jan 2013
92% complete
CT
Article
Loop-to-loop colon
The loop-to-loop colon describes an abnormal colonic course associated with the absence of the left kidney from the renal fossa.
The transverse colon extends to the lateral margin of the abdominal wall and the descending colon courses medially to fill the renal fossa, resulting in a "looped" c...
Article
Polysplenia syndrome
Polysplenia syndrome, also known as left isomerism, is a type of heterotaxy syndrome where there are multiple spleens congenitally as part of left-sided isomerism.
Epidemiology
Polysplenia is seen predominantly in female patients. It is usually diagnosed in childhood or adulthood, later than a...
Article
Giacomini vein
The Giacomini vein or thigh extension of the small saphenous vein refers to a variation in lower limb venous anatomy whereby the small saphenous vein (SSV) continues through to the thigh as a distinct branch.
The persistence of this vein may play a contributory role in the development of chroni...
Article
Capitohamate coalition
Capitohamate coalition represents the congenital fusion of the capitate and the hamate. It is the second most common type of carpal coalition after lunotriquetral coalition. It represents ~5% of all carpal fusions 1 and is associated with Apert syndrome 2.
Article
Os subfibulare
Os subfibulare is an accessory ossicle that lies at the tip of the lateral malleolus of the ankle and is rarely reported 1.
Clinical presentation
Os subfibulare are usually asymptomatic although they may eventually cause painful syndromes or degenerative change in response to overuse and traum...
Case
Cavum septum pellucidum and cavum vergae
Published
06 Mar 2013
50% complete
CT
Article
Omovertebral bone
The omovertebral bone (os omovertebrale) is present in ~35% (range 19-47%) of cases of Sprengel deformity.
Gross anatomy
It runs from the superomedial border of the scapula to the spinous processes, transverse processes or laminae of C4 to C7 1,2. Occasionally it can be bilateral 2. The connec...
Article
Sesamoid
Sesamoids, also known as sesamoid bones, are focal areas of ossification within tendons as they pass over joints 1. They can also occur in ligaments and usually measure a few millimeters in diameter. Their function is purported to be to alter the direction of the tendon and modify pressure, ther...
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