Coffee bean sign is a radiologic finding in which of the following abdominal condition?

Volvulus refers to torsion of the bowel. It most commonly occurs in the sigmoid colon or caecum of constipated elderly adults who have redundant loops of colon on a long mesentery and are therefore at risk of the colon twisting around its mesenteric axis. Coffee bean sign is a radiologic feature of sigmoid volvulus which occur when two grossly distended loops of bowel are closely apposed their compressed medial walls forms a central cleft resembling o coffee bean. Other abdominal X ray features of volvulus are: Grossly distended inveed U shaped loop of sigmoid colon extending from the pelvis to the diaphragm with a curved inner colonic wall. RUQ pointing loop suggests sigmoid volvulus and LUQ pointing loop suggests cecal volvulus. Loss of haustral folds due to distention. Ref: Radiology at a Glance By Rajat Chowdhury, page 43.