Accessory muscles of the ankle
Citation, DOI & article data
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
- lateral/peroneal compartment
peroneus quartus muscles
- peroneocalcaneus externus muscle
- peroneus digiti minimi muscle
- peroneus accessorius muscle
- peroneus quartus muscles
- anterior/extensor compartment
Accessory muscles look like normal muscles in an abnormal location on imaging studies.
The radiological report should include a description of the following features:
Accessory muscles might mimic pathological conditions such as tumors or mass lesions.
Accessory muscles of the ankle have been implicated in the following clinical conditions 3,4:
- 1. Aparisi Gómez M, Aparisi F, Bartoloni A et al. Anatomical Variation in the Ankle and Foot: From Incidental Finding to Inductor of Pathology. Part I: Ankle and Hindfoot. Insights Imaging. 2019;10(1):74. doi:10.1186/s13244-019-0746-2 - Pubmed
- 2. Sookur P, Naraghi A, Bleakney R, Jalan R, Chan O, White L. Accessory Muscles: Anatomy, Symptoms, and Radiologic Evaluation. Radiographics. 2008;28(2):481-99. doi:10.1148/rg.282075064 - Pubmed
- 3. Cheung Y. Normal Variants. Magn Reson Imaging Clin N Am. 2017;25(1):11-26. doi:10.1016/j.mric.2016.08.002 - Pubmed
- 4. Carroll JF. Accessory Muscles of the Ankle. Radsource – November 2008. MRI Web Clinic