(A) An IVP shows focal hydronephrosis of a left upper pole infundibulum (asterisk) caused by a stone in the renal pelvis (arrow). (B) A longitudinal scan of the kidney and shows clot within the collecting system (arrow) causing intrarenal hydronephrosis (asterisk). (C) An axial CT scan through the upper abdomen and shows lymphomatous infiltration of the left collecting system and focal hydronephrosis (asterisk).
