An infant with fever, oliguria, and abdominal distension

A 2-month-old had fever, decreasing urine output and progressing abdominal distension. His renal function showed mild deterioration from the normal limits and ultrasound abdomen showed right perinephric collection measuring 1.7x 0.8 cm (Panel A) with grade 1 hydronephrosis. Micturating cystourethrogram revealed extravasation of dye from right lower pelvicalyceal system and grade 5 vesicoureteral reflux (Panel B).