Compression of the common peroneal nerve by a cyst of the lateral meniscus. A case report.

Ganglion cysts that compress the common peroneal nerve frequently arise from the proximal tibiofibular joint. In a 60-year-old man, the nerve was compressed by a cyst that arose from the lateral meniscus and extended around the posterolateral aspect of the fibular neck. The origin and extent of the lesion, which could not be determined by clinical examination, was seen through magnetic resonance imaging. Cysts arising from the lateral meniscus should be considered in the differential diagnosis of compression of the common peroneal nerve.