Well-defined cystic mass in the midpole left kidney (rim of reduced T2 signal) with surrounding parenchymal swelling/oedema and extensive oedema in the perinephric fat. Rim enhancement pointing laterally towards the loin. No solid component. Nonenhancing filling defect in the left renal vein and an inferomedial branch (communicating with left paraspinal veins) consistent with thrombosis.