Malignant synovioma.
D000328:Adult; D001168:Arthritis / Q000175:diagnosis; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D013584:Sarcoma, Synovial / Q000175:diagnosis / Q000473:pathology / Q000601:surgery