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Abstract
A 70-year-old male with urinary bladder carcinoma was admitted for follow-up. Retrograde pyelography demonstrated transfer of contrast medium into the left renal vein in two independent sessions. The absence of hematuria and a negative CT scan ruled out a classical veno-caliceal fistula. The presence of a veno-caliceal valve fistula into the left renal vein was hypothesized.