RESUMO
Renal venous thrombosis occurs, for the most part, as secondary to nephrotic syndrome. In relation to infection, cases complicated with acute pyelonephritis and renal abscess have been reported. A 71-year-old woman was admitted due to vomiting, abdominal pain, watery diarrhea, and fever. Abdominal computed tomography (CT) revealed diffuse thickening of the small intestinal wall and 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 thrombus was 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 was no longer visible on abdominal CT.