What condition is suggested by a baby boy who cannot urinate on the first day of life?

• A. Hypospadias
• B. Posterior urethral valve obstruction
• C. Ureteral atresia
• D. Prenatal hydronephrosis

Answer: (B)

The situation described, where a baby boy cannot urinate within the first day of life, is highly suggestive of posterior urethral valve obstruction. This condition arises from the presence of abnormal flaps of tissue (valves) in the posterior urethra, leading to obstruction of urine flow. In male infants, this is the most common cause of urinary obstruction, and it can result in significant urinary retention.

A key aspect of this diagnosis is the timing; inability to urinate shortly after birth indicates a considerable obstruction, as urine production begins shortly after delivery. If the obstruction is severe, it may result in a distended bladder and renal problems due to backpressure.

Other conditions, such as hypospadias or ureteral atresia, while potentially causing urinary issues, would not typically present with an acute inability to urinate immediately after birth in the same way, placing posterior urethral valve obstruction at the forefront for consideration in this scenario.