A giant retrofemoral Baker's cyst.
D000328:Adult; D002062:Bursitis / Q000000981:diagnostic imaging; D005269:Femur / Q000000981:diagnostic imaging; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging*; D008297:Male; D011859:Radiography; D013581:Synovial Cyst / Q000000981:diagnostic imaging*