A 34-Year-Old Primigravida at 18 Weeks Gestation Comes to the Office

A 34-year-old primigravida at 18 weeks gestation comes to the office for a routine prenatal examination.  The patient's pregnancy has been uncomplicated.  She takes a daily prenatal vitamin, and her laboratory results have been normal to date.  The patient's personal and family medical histories are unremarkable.  During the visit, a detailed fetal ultrasound reveals unilateral hydronephrosis.  Male external genitalia are also visible.  If the fetal hydronephrosis is caused by obstruction, which of the following is the most likely site?

A) Spinal cord
B) Ureteropelvic junction
C) Urethra
D) Urinary meatus
E) Vesicoureteral junction

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