Intraneural mucous cysts of peripheral nerves

We present three cases of a rare mucous cyst inside the peripheral nerves of the upper extremity; a lateral cutaneous nerve of the forearm, a dorsal sensory branch of the ulnar nerve, and a median nerve at the wrist. All our cases were intraneural, and we excised longitudinal strips of the cyst wall between nerve fascicles in all, preserving nerve function in each case.