Right Hepatic Artery Forming Moynihan’s Hump in the Calot’s Triangle: An Unwanted Finding During Laparoscopic Cholecystectomy

The term Moynihan's hump or Caterpillar's hump is used to describe a "twisting" or "tortuous" right hepatic artery inside Calot's triangle. This abnormal artery passes in proximity to the gallbladder or cystic duct, posing a serious potential danger for surgeons operating on that area. In this case report, we present a patient who underwent a laparoscopic cholecystectomy due to gallstones within the gallbladder. During the surgical procedure, a tortuous right hepatic artery was identified within Calot's triangle, running adjacent to the gallbladder and cystic duct. Clipping and division of the short cystic artery allowed the artery to be mobilized safely, and the gallbladder was subsequently detached from the liver bed. The patient tolerated the whole procedure well, and his postoperative course was complication-free. Good anatomical knowledge is needed to identify the abnormality and prevent serious injury.