P419: Benign tumour as a rare cause of tarsal tunnel syndrome – case report

Abstract

Question: Tarsal tunnel syndrome is the most frequent entrapment neuropathy of the posterior tibial nerve [1]. It may involve also its plantar and/or calcaneal branches [3]. It is a rare and frequently underdiagnosed condition leading to motor, sensory and autonomic complications affecting the sole. Early decompression in the symptomatic cases promotes good recovery [2]. Methods:We present the case of a 59-year-old female who was admitted to our Clinic with a 2-month-history of progressive weakness and burning of the right foot. The diagnosis of the symptomatic tarsal tunnel syndrome was made based on electrodiagnostic testing and magnetic resonance imaging of the right foot. Results: Electroneurography revealed a severe right tibial nerve injury in the tarsal tunnel. MRI showed a polycyclic cystic mass medially to the lower ankle joint distorting the swollen tibial nerve. The postoperative outcome was good. Conclusions: Tarsal tunnel syndrome can be easily overlooked due to the rarity and nonspecific symptoms of this pathology and a tumour in the tarsal tunnel is an exeptional cause [2]. Insightful electrodiagnostic testing can help identify the site of injury. When combined with imaging, it constitutes a proper therapeutic regimen.