A rare case of peroneal spastic flat foot (P. S. F. F) associated with accessory scaphoid is reported. The patient is an 11 years old boy. His chief complaint was left foot pain and restriction of varus motion. On examination, his left foot had valgus deformity. No valus motion existed due to apparent spasm of the peroneal tendon. Roentgenographic revealed no significant findings except for accessory scaphoid. The symptoms were completely relieved by resection of the accessory scaphoid.
