Ruptured Peroneal Ganglion Cyst: MRI with Surgical Correlation

Abstract

We describe a case of a proximal anterior leg mass causing weak great toe dorsiflexion. The lesion was demonstrated on MR imaging as a multilocular cystic lesion within the extensor digitorum longus muscle that was connected to the proximal tibio-fibular joint by a pedicle. Fluid extravasation was present that extended inferiorly from the lesion along the fascial planes into the distal anterior lower leg. At surgery, the lesion was found to be compressing the deep peroneal nerve. The final pathologic diagnosis was peroneal ganglion cyst.

Giant Peroneal Ganglion Cyst: Imaging and Clinical Findings

“…3,7 Our patient had just sensation loss on left lower leg lateral portion without loss of strength. These cysts lead peroneal nerve compression may be peroneal nerve originated ganglion cysts and entitled peroneal intraneural ganglion cyst.…”

“…2 A study on knee magnetic resonance imaging (MRI) revealed 0.76% of the incidence of the peroneal ganglion cysts. 3 Ganglion cysts are the typical lesions although peripheral nerve compression is rare. Peroneal ganglion cysts may lead neuropathy with pain, loss of sensation, weakness on six of the foot ankle and peroneal nerve palsy due to compression of the adjacent peroneal nerve.…”