title: Popliteal masses masquerading as popliteal cysts.
abstract: Two popliteal swellings, thought initially to be synovial cysts associated with arthritic knees, were found to be unrelated tumours of serious significance. In the presence of neurological signs or a large cyst in association with a noninflammed knee joint a disease other than a simple synovial cyst should be considered.
mesh_terms: D000368:Aged; D001172:Arthritis, Rheumatoid / Q000150:complications; D003937:Diagnosis, Differential; D005260:Female; D005354:Fibrosarcoma / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D007717:Knee; D008080:Liposarcoma / Q000150:complications / Q000175:diagnosis*; D008875:Middle Aged; D009135:Muscular Diseases / Q000150:complications / Q000175:diagnosis*; D009423:Nervous System Neoplasms / Q000150:complications / Q000175:diagnosis*; D013581:Synovial Cyst / Q000175:diagnosis*