Items tagged “variants”
82 results found
Case
Beaver tail liver
Published
01 Mar 2021
91% complete
X-ray
Case
Normal both knees x-ray
Published
08 Mar 2021
85% complete
X-ray
Case
Peroneus quartus muscle
Published
24 Apr 2021
74% complete
MRI
Case
Sternal foramen
Published
23 May 2021
81% complete
CT
Case
Duplication of the internal jugular vein (IJV) - pediatric
Published
31 May 2021
84% complete
CT
Article
Accessory muscles of the ankle
Accessory muscles of the ankle are muscular anatomical variants that are usually asymptomatic but rarely cause symptoms or might be encountered on imaging studies.
The following accessory muscles around the ankle have been described 1-4:
posteromedial/flexor compartment
accessory flexor digit...
Article
Tibioastragalus anticus of Gruber muscle
The tibioastragalus anticus of Gruber (TAAG) muscle or anterior tibiotalus muscle is a rare accessory muscle of the ankle and an anatomical variant.
Summary
origin: lateral tibial surface and the interosseous membrane of the distal third of the lower leg
insertion: anterior superolateral neck...
Article
Peroneocalcaneus internus muscle
The peroneocalcaneus internus muscle, also known as fibulocalcaneus internus muscle of MacAlister, is a rare accessory muscle of the ankle and an anatomical variant with an estimated prevalence of about 1%. It is often bilateral if present.
Summary
origin: the medial surface of the distal...
Article
Tibiocalcaneus internus muscle
The tibiocalcaneus internus muscle is a rare accessory muscle of the ankle and an anatomical variant with an unknown prevalence.
Summary
origin: medial crest of the lower third of the tibia
insertion: medial surface of the calcaneus approximately 1-2 cm anterior to the Achilles tendon
Gross ...
Article
Extensor hallucis capsularis tendon
The extensor hallucis capsularis tendon, also known as secondary extensor hallucis longus, accessory extensor tendon of the first metatarsophalangeal joint, extensor ossis metatarsi hallucis or extensor ossis primi internodii hallucis is an accessory tendon or muscle of the ankle and an anatomic...
Article
Anterior fibulocalcaneus muscle
The anterior fibulocalcaneus muscle is a rare accessory muscle of the ankle and an anatomical variant.
Summary
origin: the proximal third of the fibula, peroneus tertius muscle fascia, anterior crural intermuscular septum
insertion: lateral calcaneus anterosuperior to the peroneal tubercle ju...
Article
Accessory extensor digiti secundus muscle
The accessory extensor digiti secundus muscle is a rare accessory muscle or tendon of the ankle and an anatomical variant.
Summary
origin: extensor hallucis longus tendon or muscle
insertion: medial phalanx of the second toe adjacent to the second tendon of the extensor digitorum longus muscl...
Article
Os sustentaculi
The os sustentaculi or os sustentaculum is a rare accessory ossicle of the ankle and a normal anatomical variant.
Epidemiology
The estimated prevalence is approximately 0.3-0.4% 1.
Associations
It has been found in up 24% of talocalcaneal coalitions 2.
Gross anatomy
The os sustentaculi is ...
Article
Accessory muscles of the forearm, wrist and hand
Accessory muscles of the forearm, wrist and hand are muscular, usually asymptomatic, anatomical variants that might be encountered on imaging studies and confused with pathologic conditions.
The following accessory muscles around the forearm, wrist and hand have been described 1-6:
elbow
acc...
Article
Biceps tendon with accessory head
The accessory head of the biceps brachii muscle is a normal anatomical variant and incidentally seen in some individuals with shoulder problems who were referred for shoulder MRI.
Epidemiology
The prevalence of the condition has been reported in 9.1-22.9% of the population especially in the As...
Case
Trifurcated middle cerebral artery
Published
30 Nov 2021
83% complete
MRI
Annotated image
Case
Arc of Buhler artery
Published
22 Dec 2021
95% complete
CT
Case
Hypertrophic crista galli with bone marrow
Published
21 Apr 2023
77% complete
CT
MRI
Article
Persistent sciatic vein
Persistent sciatic vein is one of two known embryonic veins in the lower limb which may persist, the other being the lateral marginal vein. Although both are associated with Klippel-Trenaunay syndrome 1-3, only the lateral marginal vein is also referred to as the Klippel-Trenaunay vein.
The sci...
Article
Posterior communicating artery hypoplasia
Posterior communicating artery hypoplasia refers to the absence of the posterior communicating artery, a blood vessel that connects the posterior cerebral artery with the internal carotid artery, thus acting as a connection between the anterior and posterior portions of the circle of willis.
I...