What is the common urinary obstruction in male neonates caused by obstruction of the prostatic urethra?

The obstruction of the prostatic urethra in male neonates that leads to urinary obstruction is most commonly caused by posterior urethral valves. These valves are abnormal folds of tissue in the urethra that can obstruct the flow of urine, leading to a variety of complications, including bladder and kidney damage due to increased pressure. This condition is often diagnosed via fetal ultrasound when the bladder appears overly distended, and it can be critical for clinicians to identify it early to manage impaired renal function.

In male neonates, posterior urethral valves are notable because they are one of the most frequently encountered congenital obstructive uropathy. This condition can potentially lead to hydronephrosis and subsequent renal impairment if not diagnosed and managed appropriately.

The other options listed do not specifically relate to the obstruction of the prostatic urethra in the same context as posterior urethral valves. Multicystic dysplastic kidney is a developmental condition that affects kidney structure, while junctional parenchymal defects involve abnormalities in kidney tissue, and tuberous sclerosis is a genetic disorder known to cause various tumors but not specifically linked to urinary obstruction in this scenario. These distinctions help clarify why posterior urethral valves stand out as the primary condition associated with