The coffee bean sign.
Feldman
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Department of Radiology, North Shore University Hospital, Manhasset, NY, USA. debfeldman@hotmail.com
D012809:Colon, Sigmoid / Q000000981:diagnostic imaging; D006801:Humans; D007415:Intestinal Obstruction / Q000000981:diagnostic imaging*; D011860:Radiography, Abdominal; D012810:Sigmoid Diseases / Q000000981:diagnostic imaging*