PMC6000771_01
CT scan of the abdomen without evident anatomic variations.
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There was no evidence of any anatomic abnormalities of the large intestine (Fig. 1).
Exposure of the operative field. (1: mesentery of the small intestine/2: sigmoid colon and accompanying mesosigmoid/3: canal between abdominal aorta and mesentery).
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During this surgical step, surgeons incidentally detected abnormal length and position of both sigmoid colon and its mesocolon (Fig. 2).
Exposure of the operative field. (1: mesentery of the small intestine/2: sigmoid colon and accompanying mesosigmoid/3: canal between abdominal aorta and mesentery).
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More specifically, the sigmoid colon and the mesosigmoid, originating from the brim of the pelvis, had ascending course to the abdomen and passed through a canal between the mesentery of the small intestine and the abdominal aorta (Fig. 3).
Detailed exposure of the redundant loop of sigmoid colon (1: mesentery of the small intestine/2: canal between abdominal aorta and mesentery/AL: ascending loop of the sigmoid colon and accompanying mesosigmoid sigmoid colon and accompanying mesosigmoid/DL: descending loop).
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Meticulous surgical exposure revealed that the ascending loop of the sigmoid colon and its mesocolon were positioned posterior to the mesentery and then continued as a descending loop, passing between the posterior surface of the mesentery and the anterior surface of both abdominal aorta and inferior vena cava (Fig. 4).
Postoperative CT scan of the abdomen. Dolichocolon is not evident.
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At the follow-up, two months after the operation the patient disclosed none discomfort and the post-operative CT scan of the abdomen was unremarkable (Fig. 5).