TARSAL TUNNEL-SYNDROME CAUSED BY STRAIN OF AN ANOMALOUS MUSCLE - AN MRI-SPECIFIC DIAGNOSIS

Tarsal tunnel syndrome (TTS) is a compression neuropathy of the poster ior tibial nerve in the ankle, commonly caused by a mass lesion such a s ganglion, tumor, fracture, or post-traumatic fibrosis. Although anom alous muscle is relatively common in the ankle, there has been only on e report to date implicating it in TTS. This case demonstrates MR find ings of a strained flexor digitorum accessorius longus muscle as an un usual cause of TTS.