This article presents a complex case of supraceliac aorta-to-SMA bypass performed for acute-on-chronic mesenteric ischemia complicated by bowel necrosis and perforation in a patient with a history of prior abdominal surgeries. Key steps include supraceliac aortic exposure, retropancreatic tunneling, and distal anastomosis using a cryopreserved SFA graft. Intraoperative findings of ischemic terminal ileum and an ileocolic fistula necessitated ileocecectomy and left the patient in discontinuity. Critical decision-making in the setting of contamination, with emphasis on graft selection, anatomical exposure, and staged reconstruction planning are highlighted. The patient’s prior abdominal surgery added further technical difficulty to the operative approach and dissection.