Items tagged “variants”

82 results found
Case

Beaver tail liver

  Diagnosis certain
Muhammad Shoyab
Published 01 Mar 2021
91% complete
X-ray
Case

Normal both knees x-ray

  Diagnosis certain
Naim Qaqish
Published 08 Mar 2021
85% complete
X-ray
Case

Peroneus quartus muscle

  Diagnosis almost certain
Ammar Haouimi
Published 24 Apr 2021
74% complete
MRI
Case

Sternal foramen

  Diagnosis certain
Ammar Haouimi
Published 23 May 2021
81% complete
CT
Case

Duplication of the internal jugular vein (IJV) - pediatric

  Diagnosis certain
Ammar Haouimi
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

  Diagnosis certain
Muhammad Shoyab
Published 30 Nov 2021
83% complete
MRI Annotated image
Case

Arc of Buhler artery

  Diagnosis certain
Cedric Bohyn
Published 22 Dec 2021
95% complete
CT
Case

Hypertrophic crista galli with bone marrow

  Diagnosis almost certain
Gennaro D'Anna
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...

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