The blood supply of the abdominally-placed vertical sigmoid colon.

We have recorded the blood supply to a high or subsplenic sigmoid loop from branches of the left colic and first sigmoid arteries. An accessory middle colic present in this case crossed the region immediately superior to the apex of the sigmoid loop. In this instance it arose from the dorsal pancreatic which also gave origin to inferior pancreaticoduodenal branches. Since the high sigmoid may be retroperitoneal, as in the case described, it would not be readily apparent; it would require lateral views to separate it from the descending colon radiographically.