Items tagged “variant”

The accessory anterior inferior tibiofibular ligament (accessory AITFL), also known as Bassett's ligament, is an anatomical variant present in many ankles. Pathological thickening of the accessory ligament is seen in the setting of inversion injury that causing the pain due to mild anterior inst...

The retro-aortic left brachiocephalic vein is a rare vascular variant where the left brachiocephalic vein passes more inferiorly through the superior mediastinum, coursing inferior to the aortic arch and posterior to the ascending aorta to join the right brachiocepahilc vein forming the superior...

The adductor minimus muscle is a small, variably present muscle in the medial compartment of the thigh.   Terminology Due to confusion about this muscle over the years it has ended up with a variety of names, which include pars lateralis, adductor quartus muscle, premier faisceau du grand addu...

The accessory flexor digitorum longus muscle is an accessory muscle in the deep posterior compartment of the leg with a reported prevalence of 6-8%. Unilateral muscles are more common although bilateral cases have been reported. Summary origin: variable; either the medial margin of the tibia a...

McDonald and McClellan classified crossed renal ectopia into four types 1: bilateral crossed renal ectopia without fusion unilateral crossed renal ectopia bilaterally crossed renal ectopia: represents 90% of all crossed ectopias and includes crossed fused renal ectopia   crossed unfused rena...

An accessory abductor digiti minimi (ADM) muscle is the most common accessory muscle of the hand and wrist, found in 24% of individuals on the hypothenar eminence. When present it is one of the intrinsic muscles of the hand. Summary origin: antebrachial fascia passing anteriorly to Guyon cana...

A Chiari network refers to a filamentous, weblike structure in the right atrium that results from incomplete resorption of the embryonic sinus venosus. It is an uncommon anatomical variant. Epidemiology Prevalence estimates for the general population vary widely, ranging from 2%-10% of randoml...