Items tagged “variant”
426 results found
Article
Hippocampal sulcus remnant cyst
Hippocampal sulcus remnant cysts, also known as hippocampal cavities, are remnants of incomplete involution of the embryonic hippocampal fissure and are an incidental finding.
Epidemiology
They are seen in ~25% (range 10-40%) of the adult population 1,3.
Clinical presentation
These are asy...
Article
Aberrant arachnoid granulations
Aberrant arachnoid granulations, also known as arachnoid pits, are arachnoid granulations that penetrated the dura but failed to migrate normally in the venous sinus. They are most often located in the greater wing of the sphenoid bone and may be seen in idiopathic intracranial hypertension. Occ...
Case
Absent ligamentum teres of the hip
Published
30 Sep 2013
74% complete
MRI
Case
Os triangulare
Published
01 Oct 2013
86% complete
Annotated image
X-ray
Article
Os triangulare
The os triangulare (also known as the os intermedium antebrachii or os triquetrum secundarium) is an accessory ossicle located between the ulnar styloid, lunate and triquetrum 1,2.
They may be unilateral or bilateral and the main differential diagnosis is non-union of an ulnar styloid process f...
Article
Os paratrapezium
Os paratrapezium is an accessory ossicle located between distal radial aspect of the trapezium and the base of the 1st metacarpal 1.
Differential diagnoses include loose bodies secondary to trapreziometacarpal joint osteoarthritis or secondary to trauma (e.g. Bennett's fracture) 2.
Article
Os supratrochleare dorsale
Os supratrochleare dorsale, also called os supratrochleare posterius is an accessory ossicle of the elbow located in the olecranon fossa of the humerus 1. It may become symptomatic due to trauma during elbow extension and as such may require surgical removal 2.
Differential diagnosis
osteochon...
Case
Os radiostyloideum and triquetral fracture
Published
02 Oct 2013
86% complete
X-ray
Annotated image
Article
Os radiostyloideum
Os radiostyloideum (or persistent radial styloid) is an accessory ossicle of the wrist located adjacent to the radial styloid process and lateral to the mid-portion of the scaphoid.
This should not be confused with another bony ossicle in the wrist, os styloideum (part of a carpal boss), which...
Article
Cyamella
A cyamella is a rare sesamoid bone that exists as a normal variant within the popliteus tendon, characteristically located at the lateral aspect of the distal femur in the popliteal groove.
Cyamella is best seen on the AP view of plain radiograph as opposed to fabella, which is best appreciated...
Article
Canalis basilaris medianus
The canalis basilaris medianus (median basal canal), also known as clival canal, median clival canal, or inferior median clival canal, refers to a number of anatomic variant midline canals in the clivus, typically involving the basioccipital portion.
Gross anatomy
These canals are generally we...
Article
Stylohyoid ligament
The stylohyoid ligament forms part of the styloid apparatus. The origin is at the styloid process of the temporal bone and it inserts into lesser horn of the hyoid bone.
The stylohyoid ligament provides part of the origin for the middle pharyngeal constrictor muscle and styloglossus muscle. It ...
Case
Aberrant right subclavian artery
Published
10 Oct 2013
74% complete
CT
Case
Multipartite patella
Published
13 Oct 2013
79% complete
X-ray
Case
Bovine arch with thyroidea ima artery
Published
13 Oct 2013
98% complete
CT
Article
Supernumerary kidney
Supernumerary kidneys, also known as accessory kidneys, are a rare congenital anomaly of the urogenital system, where there are one or two additional kidneys.
Epidemiology
Less than 100 cases have been documented in the medical literature.
Associations
Many conditions have been found to be a...
Case
Sprengel deformity
Published
18 Oct 2013
75% complete
X-ray
Article
Bifid ureter
A bifid ureter, or ureter fissus, is an example of incomplete duplication of a duplex collecting system and is an anatomical variant.
Terminology
Multiple seemingly unrelated terms for blind-ending bifid ureters are currently in use and there is no consensus on terminology in the literature. T...
Article
Transposition of inferior vena cava
Transposition of inferior vena cava (also known as left-sided IVC) refers to a variant course of the inferior vena cava. It is the most common anomaly of IVC and occurs due to persistence of left supracardinal vein.
Diagnosis of left sided inferior vena cava is important for:
planning of vascu...
Article
Ansa pancreatica
Ansa pancreatica is a rare type of anatomical variation of the pancreatic duct. It is a communication between the main pancreatic duct (of Wirsung) and the accessory pancreatic duct (of Santorini). Ansa pancreatica has been considered as a predisposing factor in patients with idiopathic acute pa...
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