Acute scrotal pain from idiopathic ilioinguinal neuropathy: diagnosis and treatment with EMG-guided nerve block.

Ilioinguinal nerve entrapment presents with a clinical triad of pain in the iliac fossa and inguinal region, sensory abnormalities in the cutaneous distribution of the nerve and tenderness on palpation 2-3 cm medial and below the anterior superior iliac spine. The syndrome poses diagnostic difficulties, as genitofemoral nerve entrapment and non-neurological conditions of the lower abdomen may cause similar pain. We report on a patient with acute groin pain radiating towards the scrotum, caused by ilioinguinal nerve entrapment. The clinical diagnosis was strongly suggested by electromyographic examination, using the monopolar needle as a deep stimulating electrode. Subsequent nerve blockade caused complete relief of symptoms. The technique is described. Future applications for treatment of post-surgical pain are discussed.