Compression neuropathy of the ulnar nerve is a well-recognized syndrome. However, cubital tunnel syndrome caused by compression by benign extraneural soft-tissue tumors is uncommon. Barber et al. reported 11 cases of cubital tunnel syndrome, the causes of which were ganglion cyst, lipoma, fibrolipoma, and epidermoid cyst. 1 We report here a rare case of acute cubital tunnel syndrome caused by compression by a hemangioma in a 59-year-old man. Case Report A 59-year-old right-handed man with a 2-week history of pain on the medial side of his left elbow and dysesthesia in his left ring and small fingers presented. He has experienced swelling at the medial aspect of his left elbow for the last 15 years. He had no history of injury to his left elbow. On examination, a soft, round mass, approximately 3 cm in diameter, was noticed at the posterior aspect of the medial epicondyle. Claw deformity of the ring and small fingers of the left hand and atrophy of the hypothenar and interosseous muscles were observed. He could not abduct the small finger and the Froment sign was positive. Hypesthesia was noted in the ring and small fingers. The Tinel sign was positive at the cubital sulcus. Motor nerve conduction velocity of the left ulnar nerve between the