Left kidney shows small size (7.5 cm in bipolar dimension), decreased parenchymal thickness and markedly dilated, ballooned renal pelvis and calyces with abrupt termination at the pelviureteric junction. No intraluminal or mural cause for obstruction detected. The left ureter is of normal calibre. Delayed contrast excretion at the left pelvicalyceal system and no contrast reaches left ureter at the excretory phase.