The ulnar bursa.
D001344:Autopsy; D001466:Barium Sulfate; D002061:Bursa, Synovial / Q000000981:diagnostic imaging*; D005385:Fingers / Q000000981:diagnostic imaging*; D006801:Humans; D011859:Radiography; D014953:Wrist / Q000000981:diagnostic imaging*
D001466:Barium Sulfate