The Unusual Suspect—Tarsal Tunnel Syndrome Due to Flexor Digitorum Brevis Hypertrophy

A rare case of tarsal tunnel syndrome caused by flexor digitorum brevis hypertrophy. The patient presented with medial plantar pain and paresthesia but denies any injury. Magnetic resonance imaging revealed a marked hypertrophy of the flexor digitorum brevis in close proximity to the medial and lateral plantar nerves, with herniation into the porta pedis. Surgical excision of the herniated muscle was performed, along with a tarsal tunnel release. The combined treatment resulted in symptomatic relief.