Haemangioma of the knee-joint.
D000293:Adolescent; D006391:Hemangioma / Q000473:pathology*; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging*; D008297:Male; D008853:Microscopy; D011859:Radiography; D013583:Synovial Membrane / Q000473:pathology