An infant is noted to have a left flank mass shortly after birth and an ultrasound examination demonstrates left hydronephrosis. The most common cause of this finding is which of the following?
A. Neonatal Wilm’s tumor
B. Congenital ureteropelvic junction obstruction
C. Multicystic dysplastic kidney
D. Vesicoureteral reflux
Answer:B
An infant is noted to have a left flank mass shortly after birth and an ultrasound examination demonstrates left hydronephrosis. The most common cause of this finding is which of the following?
A. Neonatal Wilm’s tumor B. Congenital ureteropelvic junction obstruction C. Multicystic dysplastic kidney D. Vesicoureteral reflux