Sigmoid volvulus

Intestinal volvulus is defined as a complete twisting of a loop of intestine around its mesenteric attachment site. It is related to but not precisely synonymous with malrotation, a more general term used when the normal process of rotation and fixation of the midgut goes awry. Malrotation may lead to 2 critical complications: mechanical obstruction of the proximal intestine and twisting of the intestines with subsequent ischemia (with or without necrosis) of part or all of the midgut. (from emedicine)

Image from (link)  Contributed by Dr. Mustafa Alsultan

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