Nonenhanced CT scan in a 12-year-old boy demonstrates marked hydronephrosis and cortical thinning in a patient with grade V vesicoureteral reflux and a history of a posterior urethral valve. Note the free fluid in the pararenal space consistent with forniceal rupture after minor trauma to the abdomen (from football practice).


http:// emedicine.medscape.com/article/414836-overview