RT Journal Article SR Electronic T1 Sigmoid volvulus: Coffee bean sign, whirl sign JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 81 OP 82 DO 10.3949/ccjm.87a.19064 VO 87 IS 2 A1 Kajihara, Yusaku YR 2020 UL http://www.ccjm.org/content/87/2/81.abstract AB