Hello my friend Thanks for your question on HCM Hemangiomas of muscle and bone are abnormal proliferations of blood vessels that may be asymptomatic or may cause symptoms such as pain and swelling. There are different type of Hemangiomas like: 1.Intramuscular hemangiomas 2.Synovial hemangiomas 3.Osseous hemangiomas(of bone) 4.Hemangiomatosis 5.Gorham disease 6.Gorham disease 1.Intramuscular hemangiomas: Observation is appropriate for asymptomatic or mildly symptomatic hemangiomas of skeletal muscle and bone. If symptoms cannot be managed adequately by activity modification and nonnarcotic analgesics, further treatment may be considered. 2.Synovial hemangiomas: Local pedunculated synovial hemangiomas are removed surgically, often through an arthroscope 3.Osseous hemangiomas: Hemangiomas of bone rarely require treatment So my advice is to go to an specialist and let him see your knee.Then he will say what to do Hope this information is helpful Best regards