Arthroscopic excision of synovial hemangioma of the knee.

A synovial hemangioma in the knee joint of a 33-year old woman was diagnosed and removed arthroscopically. Preoperatively, this rare benign soft tissue lesion had caused recurrent swelling of the knee along with persistent pain and occasional buckling. Two years after surgery, the patient has a painless range of motion with no evidence of recurrence.