[Intraneural ganglia of the common peroneal nerve].

Intraneural ganglia (pseudocysts) of the peronaeus communis nerve are rare diseases. A palpable tumour in the popliteal fossa, paraesthesia, and myasthenia, followed by sensorial and locomotor failures, are the clinical symptoms. Symptoms are mild at the beginning, which makes early detection difficult. Microsurgical extirpation of the ganglia, without touching the nerve fibres, is the therapeutic approach. Three of the authors' own cases are described in some detail.