Synovial haemangiomas are benign vascular lesions that originate from any synovial tissue, which may behave like locally aggressive. Haemangiomas developing in the hand in relation to tendon and the tenosynovium (tendon sheath) are very rare. Among the differential diagnosis for lesions of the hand, synovial hemangioma of the articular surface and tendon sheath is often overlooked due to its rare nature. A 49 year-old woman applied for a mass on her right dominant hand forth finger above the flexor tendon at the 4th metacarpophalangeal joint site is presented in this study. An ultrasonography was planned which confirmed a soft tissue lesion above the 4th flexor tendon at the 4th metacarpophalangeal joint site with appearance similar to giant cell tumour of the tendon sheath. After excision, the histopathologic analysis demonstrated tenosynovial haemangioma. The rare causes of finger masses should be considered also during the differential diagnosis. Local invasions and recurrence may be prevented with early surgical treatment and total excision of the lesion.