Isolated dissection of the celiac trunk is a rare vascular condition that is often discovered incidentally on contrast-enhanced computed tomography (CT). We report the case of a 72-year-old male who presented to the emergency department with acute biliary pancreatitis. Contrast-enhanced abdominal CT revealed biliary obstruction and an incidental aneurysmal dilatation of the celiac trunk associated with two distinct dissection planes extending toward the splenic artery without vascular occlusion or organ ischemia. As the vascular lesion was asymptomatic, conservative management with clinical and imaging follow-up was recommended. This case highlights the importance of systematic evaluation of vascular structures during emergency CT examinations, even when imaging is performed for non-vascular indications.