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Fig. 3A. —68-year-old man with hepatic metastasis from rectal cancer. CT during arterial portography image shows several portal perfusion defects that mimic metastatic tumor deposits (arrowheads) and were confirmed at surgery with intraoperative sonography and follow-up imaging to be nontumorous portal perfusion abnormality. Note that subcapsular portal perfusion defect adjacent to right rib was presumably caused by impression of right rib and that portal perfusion defect in posterior aspect of segment IV was presumably caused by aberrant right gastric venous drainage. Also note hepatic metastasis (arrow).