The accessory soleus and recurrent tarsal tunnel syndrome: case report of a new surgical approach.

The accessory soleus muscle is a rare anatomic variant, which presents as a mass in the posteromedial aspect of the ankle. This anomaly has been linked with compression neuropathy of the posterior tibial nerve. The authors present a case of tarsal tunnel syndrome in which the presence of an accessory soleus was unrecognized at the time of the original procedure, but was utilized during the revisional operation to provide safe coverage of the posterior tibial nerve.