Presentation
The patient presented with left ankle pain which increases during physical activity.
Patient Data
Accessory soleus muscle lies between the flexor hallucis longus and Achilles tendon. It is seen superficial to flexor retinaculum and obliterating the Kager’s fat pad. There is shrinkage of the muscle towards its tendinous insertion into the posteromedial aspect of the calcaneus.
Type II accessory navicular bone with mild bone marrow edema involving both the accessory ossicle and navicular bone.
Mild talofibular and talocalcaneal joint effusion.
Prominent Stieda process of the talus.
Minimal fluid at the retrocalcaneal bursa.
Case Discussion
The accessory soleus muscle is a rare congenital supernumerary anatomical variation of the lower leg, where an additional muscle is present adjacent to the normal soleus muscle. The disease can be asymptomatic but commonly presents as a posteromedial ankle swelling, which may become painful during physical activity.
As it presents with swelling or mimic a soft tissue tumor, it is essential to differentiate this condition from other lesions such as ganglion, lipoma, hemangioma, and sarcoma.
The radiological features are typical of accessory soleus muscle.
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