**Core Concept**
A varicocele is an abnormal enlargement of the pampiniform plexus of veins in the scrotum, similar to varicose veins in the legs. The condition is often associated with infertility, low sperm count, and sperm dysfunction. Varicoceles are a common cause of male infertility, affecting approximately 15% of men.

**Why the Correct Answer is Right**
Varicoceles occur when the valves within the pampiniform plexus fail to function properly, causing blood to pool and resulting in vein enlargement. This condition can lead to increased scrotal temperature, which may damage sperm and contribute to infertility. Varicoceles are often diagnosed using physical examination, ultrasound, or Doppler studies. The primary treatment for varicocele is surgical repair, known as varicocelectomy.

**Why Each Wrong Option is Incorrect**
**Option A:** Varicoceles are a common cause of male infertility, affecting approximately 15% of men. This statement is true.
**Option B:** Varicoceles occur when the valves within the pampiniform plexus fail to function properly. This statement is true.
**Option C:** Varicoceles can be treated with medications, such as vasodilators or anti-inflammatory agents. This statement is false, as the primary treatment for varicocele is surgical repair.
**Option D:** Varicoceles are a rare condition, affecting less than 1% of men. This statement is false, as varicoceles are a relatively common cause of male infertility.

**Clinical Pearl / High-Yield Fact**
Varicocele is a common cause of male infertility, and surgical repair is the most effective treatment. Patients with varicocele should be evaluated for underlying causes, such as testicular torsion or hydrocele.

**Correct Answer:** C. Varicoceles can be treated with medications, such as vasodilators or anti-inflammatory agents.