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Renal venous thrombosis occurs, for the most part, as secondary to nephrotic syndrome. In relation to infection, cases complicatedwith acute pyelonephritis and renal abscess have been reported. A 71-year-old woman was admitted due to vomiting, abdominalpain, watery diarrhea, and fever. Abdominal computed tomography (CT) revealed diffuse thickening of the small intestinal walland left renal venous thrombosis. The enteritis rapidly resolved with conservative treatment including fasting and antibiotic therapy;anticoagulation therapy was started. After 3 months, the renal vein thrombosis had much improved, but a tiny remnant thrombuswas seen on follow-up abdominal CT. After 4 months of additional anticoagulation therapy, the remnant thrombus remained unchanged,at which point warfarin was switched to clopidogrel, an antiplatelet agent, and after 8 months the remnant thrombus wasno longer visible on abdominal CT.