**Question:** Which is not a feature of posterior urethral valve -

A. Obstruction to urine flow
B. Congenital anomaly
C. Urethral dilatation
D. Urethral diverticulum

**Correct Answer:** D. Urethral diverticulum

**Core Concept:** Posterior Urethral Valve (PUV) is a congenital anomaly characterized by the presence of an abnormal valve-like structure in the posterior urethra, leading to obstruction of urine flow. This can result in severe lower urinary tract dysfunction in neonates and infants.

**Why the Correct Answer is Right:** Urethral diverticulum is not a feature of PUV, as it refers to a pouch-like structure that develops from the membranous urethra, whereas PUV involves the development of an abnormal valve in the posterior urethra. Urethral diverticulum is a separate entity unrelated to PUV.

**Why Each Wrong Option is Incorrect:**

A. Obstruction to urine flow is indeed a feature of PUV, as the valve-like structure causes a blockage in the urethra, leading to impaired urine flow and retention.

B. While congenital anomaly is a correct description of PUV, option D (urethral diverticulum) is more specific to an unrelated condition, not related to the core concept.

C. Urethral dilatation is a possible consequence of PUV but is not the core feature distinguishing PUV from the correct answer (D).

**Clinical Pearl:** Understanding the distinction between PUV and urethral diverticulum is crucial for accurate diagnosis and management of neonates and infants presenting with obstructive uropathy. Early diagnosis and intervention are essential to prevent long-term complications such as renal scarring, hypertension, and end-stage renal disease.