A fairly large cystic lesion is related to the anterior aspect of left kidney. In delayed images, it appears connected to the renal calyces and filled with contrast. The ureter could be identified arising from the inferior aspect of this cyst. Also there is moderate left hydronephrosis with parenchymal thinning and no contrast seen at left ureter suggesting PUJ obstruction.
Diagnosis: Extrarenal pelvis with PUJ obstruction and moderate hydronephrosis.