Objective: To identify the frequency of different arterial variants of common hepatic artery (CHA) overview identified at abdominal CT angiography (CTA) performed in a large series of patients undergoing CT scans for various reasons.
Study design: Observational study.
Place and duration of study: Department of Surgical Oncology and Radiology, Shaukat Khanum Memorial Cancer Hospital & Research Centre, Lahore, Pakistan, from October 2016 to September 2018.
Methodology: Findings in randomly selected 1000 patients who underwent CTA were retrospectively evaluated. The pattern of aortic origin of branches of the celiac trunk and superior mesenteric arteries was analysed. The CHA anatomy was then investigated. Hepatic artery anomalies were classified by the Hiatt's method.
Results: There were 629 males and 371 females with a median age of 54 years. Type 1 variation (normal anatomy) was seen in 644 patients. Type 2 variation (left hepatic artery, LHA, aberrations), was seen in 135 patients. LHA was seen arising from left gastric artery or common hepatic artery (CHA) in most of the cases. One patient had a replaced LHA from superior mesenteric artery (SMA). Sixteen patients had an accessory LHA and 119 had a replaced LHA. Type 3 variation (unusual anatomy of right hepatic artery, RHA) was seen in 121 patients, 7 patients had an accessory and 114 had a replaced RHA . The replaced or accessory right hepatic artery originated anywhere from SMA, celiac trunk, aorta, CHA or gastroduodenal artery (GDA). Type 4 variation (unsual origin of both RHA and LHA) was seen in 73 patients. Type 5 variation (CHA arising from SMA) was seen in 23 patients. Type 6 variation (CHA arising directly from aorta) was seen in four patients.
Conclusion: Arterial variations are common in our population of patients. A detailed understanding and knowledge of these variations is necessary for surgeons and radiologists to avoid any inadvertent injuries during various procedures.