[Ganglions a rare cause of isolated peripheral nerve lesions].

Extra- and intraneural ganglionic cysts rarely involved peripheral nerves. They are found in the neighbourhood of large joints. The ulnar nerve is affected most often by extraneural cysts at the wrist. Intraneural cysts prefer the peroneal nerve at the tibiofibular joint. Ganglionic cysts as a cause of peripheral nerve damage are often overlooked, mainly because they are not considered as a cause of pain, paresis or sensory changes. Surgical treatment is recommended.