Intraneural cavernous hemangioma: a rare case of extrafascicular left ulnar nerve tumor.

Hemangiomas are benign soft tissue tumors that may be found everywhere in the human body. As one of the hemangioma types, cavernous hemangioma consists of a flat endothelium along with blood-filled spaces and may be found in the central nervous system, but rarely occurs in peripheral nerves. This article pertains to the introduction of an old female patient complaining of pain and paresthesia of the ulnar side of the left forearm and hypothenar with numbness and tingling of the fourth and fifth digits and clawing. The patient was medically treated for a month but became a surgical candidate due to the poor response to medical treatment. A 1-cm lesion was observed in the surgery with compression on the ulnar nerve in the ulnar groove. Neurologic symptoms of the patient were improved after excision of the lesion, but clawing persisted.