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Arterial anomalies of the viscera are not unusual. Of the arterial anomalies, the celiac and the superior mesenteric anomalies are well studied and reviewed in the literature. These variations are due to changes occurring during the development of vessels. Also, the variations in the colonic blood supply have been detailed in the context of conduit surgery in esophageal replacement and oncological resections. Of these, the rarer anomaly is the aberrant left colic artery (ab LCA). Previously described in various anatomic descriptions; it has never been reported in a clinical situation. A middle-aged female presented with abdominal pain and lower gastrointestinal (GI) bleed. On further evaluation, she was diagnosed to have transverse colon malignancy. She underwent extended right hemicolectomy with complete mesocolic excision and D3 lymphadenectomy as classically described. During the dissection, she was found to have an LCA arising from the superior mesenteric artery (SMA) just below the inferior border of the pancreas two centimeters higher to the origin of the middle colic artery. This artery was carefully dissected and preserved. Injury of the ab LCA is possible given the unusual course of the artery. Implications of iatrogenic injury in colonic and pancreatic surgeries may result in additional morbidity which is discussed in detail.

Aberrant Left Colic Artery and Its Surgical Implications