**Core Concept:** Urethral meatus positioning in newborns

The correct positioning of the urethral meatus in a newborn boy is typically located on the ventral surface of the glans penis. An abnormal positioning of the meatus indicates a congenital birth defect.

**Why the Correct Answer is Right:**

In this question, the correct answer refers to a specific congenital anomaly: **hypospadias**. Hypospadias is a common malformation of the male urethral system, where the urethral meatus deviates from its typical ventral location to the glans penis to an abnormal position, usually on the penile shaft.

**Why Each Wrong Option is Incorrect:**

A. **Hypospadias (Correct Answer)**: This is the correct diagnosis for the presented case, as it involves a deviated urethral meatus on the penile shaft.
B. **Urethrocutaneous fistula (Incorrect Answer)**: This refers to a communication between the urethra and the skin, typically seen as a small opening on the penile skin, not the penile shaft.
C. **Ectopic urethral meatus (Incorrect Answer)**: This term is less specific than hypospadias and does not specifically address the penile shaft location.
D. **Glans penis (Incorrect Answer)**: The urethral meatus in a healthy newborn should be on the ventral surface of the glans penis, not on the penile shaft.

**Clinical Pearl:**

Hypospadias is a critical diagnosis to identify promptly as it may require surgical intervention for proper management and to prevent complications such as urinary tract infections, meatal stenosis, and infertility later in life. Early diagnosis and treatment are essential for a favorable prognosis.

**Correct Answer:** Hypospadias