A redundant loop of descending colon and right sided sigmoid colon

During routine dissection for undergraduate students in the Department of Anatomy, NRS Medical College, Kolkata, India, few rare variations in the disposition of large intestine and inferior mesenteric artery were noted in a 70-year-old male cadaver. Variations were as: The caecum and appendix were present in right lumbar region and a short ascending colon (about 10 cm in length) extended from the caecum up to the first hepatic flexure. Usual transverse colon was present with mesocolon and splenic flexure with phrenico-colic ligament. A redundant loop of descending colon crossed the great vessels of abdomen to form a second hepatic flexure. The descending and sigmoid colon were present on the right side of abdomen. Inferior mesenteric artery arose from the right side of the ventral surface of the abdominal aorta to supply the left one-third of transverse colon, splenic flexure, descending colon, sigmoid colon, etc. This was a rare case.