[Total ulnar nerve paralysis due to acute traumatic aneurysm at the forearm].

We are reporting a case of complete ulnar nerve paralysis due to compression from a false aneurysm located in the distal forearm. The aneurysm developed after the patient stabbed himself with a meat hook. The ulnar paralysis developed after a 14-day period of latency. The diagnosis was made using detailed patient history, clinical examination, and a sonogram. Early surgical decompression of the nerve led to complete restitution of all functions.