Renal vein thrombosis is caused by all except -

RENAL VEIN THROMBOSIS Most commonly occurs in left renal vein and it is bilateral in 2/3rd cases. Etiology-divided into 3 categories vascular endothelial damage -produced by homocystinuria, endovascular intervention and surgery . venous stasis - dehydration ,compression and kinking of renal veins due to retroperitoneal fibrosis and abdominal neoplasm. Hypercoagulability-secondary to nephrotic syndrome ,protein c, s ,antithrombin defeciency, factor v leiden, disseminated malignancy, antiphospholipid syndrome and oral contraceptives. Doppler ultrasonography is the first best investigation for screening . Ref:Harrison 20th edition pg. No. 2167