Peroneal nerve palsy caused by intraneural ganglion

A case of peroneal nerve palsy caused by an intraneural ganglion is present ed. The cystic mass was located posterolateral to the lateral femoral condy le and extended along the common peroneal nerve distal to the origin of the peroneus longus muscle. The nerve was compressed in the narrow fibro-osseo us tunnel against the fibula neck and the tight origin of the peroneus long us muscle. The nerve was decompressed by complete tumor excision and transe ction of the origin of the peroneus longus muscle. Full recovery of nerve f unction was obtained in 6 months.