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). His blood and urinary culture were sterile, however, he needed prophylactic broad-spectrum antibiotics, continuous urinary catheterization and percutaneous drainage of the ascites. His urinary electrolytes consistent with urinary ascites and cystoscopy revealed posterior urethral valve and irregular bladder which eventually required ablation of the valve. Urinoma secondary to the posterior urethral valve occur because of rupture of calyceal fornixes. Pelvicalyceal rupture secondary to posterior urethral valve resulting in urinary ascites was likely condition in this patient. His pelvicalyceal rupture improved without any intervention, renal function back to normal and percutaneous drainage catheter was removed.