[Perineal neuralgia].

Ninety cases of chronic perineal pain of neurological origin are reported. Alcock's canal syndrome, consecutive to damage of the pudendal nerve in the ischiorectal fossa, is the most frequent of these neuralgias. It is characterized by burning pain or paraesthesia increased in sitting position and relieved by standing up. The specific treatment is CT-guided infiltrations of the pudendal nerve. Other neurological causes are spinal cord lesions (notably tumours of the conus medullaris), sacral meningoradiculitis (perineal herpes zoster), plexitis and pudendal nerve neuritis. In some cases the responsibility of perineal stretching neuropathy may be considered. In all patients, electrophysiological exploration of the perineum (detection of perineal floor muscles, sacral latency, somatosensory and motor evoked potentials of the pudendal nerve) are necessary to confirm the aetiological diagnosis and guide neurological investigations.