Objective    To retrospectively review the diagnosis and treatment of intraarticular synovial hemangioma of the knee under arthroscope.     Methods    Six cases of intraarticular synovial hemangioma of the knee were included. The examination of X ray and MRI before surgery indicated intraarticular synovial hemangioma in 5 cases and pigmented villonodular synovitis in 1 case

then arthroscopic diagnosis and excision of the lesions were followed.     Results    The six cases were definitely diagnosed as intraarticular synovial hemangioma. Under arthroscope

the lesions exhibited as irregular dark blue or purple capillary clumps of different sizes. The postoperative follow-up of 10.7 months in average (range 4-23 months) shows good joint function for all the patients and no signs of recurrence at the last follow-up.     Conclusion    Intraarticular synovial hemangioma is rare with a high rate of misdiagnosis. Careful physical examination and MRI can help to make the diagnosis. Arthroscopic surgery is a choice of diagnosis and treatment for intraarticular synovial hemangioma of knee.