**Core Concept**
Posterior urethral valves (PUV) are congenital obstructions of the urethra, primarily affecting male infants and children. They are a result of abnormal development of the urethral folds during fetal development, leading to obstruction of the urethral lumen. PUVs are a common cause of lower urinary tract obstruction (LUTO) in male infants.

**Why the Correct Answer is Right**
The correct answer will be the option that is not a characteristic or feature of posterior urethral valves. PUVs are typically associated with symptoms such as urinary retention, incontinence, and recurrent urinary tract infections (UTIs). They can also lead to complications such as hydronephrosis, renal failure, and bladder dysfunction. In addition, PUVs are often associated with a characteristic "keyhole" appearance on voiding cystourethrogram (VCUG) imaging.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because posterior urethral valves are indeed a cause of urinary retention in male infants.
**Option B:** This option is incorrect because PUVs are often associated with a characteristic "keyhole" appearance on VCUG imaging.
**Option C:** This option is incorrect because posterior urethral valves can lead to complications such as hydronephrosis and renal failure.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of PUVs is the presence of a "keyhole" appearance on VCUG imaging, which is a result of the obstructed urethral lumen. This imaging finding is often used to diagnose PUVs in affected infants.

**Correct Answer:** Not Given