**Core Concept**
Testicular torsion is a urological emergency that requires prompt diagnosis and treatment to preserve testicular function. It occurs when the spermatic cord becomes twisted, cutting off blood supply to the testicle.

**Why the Correct Answer is Right**
In a child with acute scrotal pain and swelling, the clinical suspicion of testicular torsion is high. The gold standard for diagnosing testicular torsion is clinical examination, and imaging studies are not recommended initially due to the risk of delaying treatment. The correct answer is to perform an urgent surgical exploration, specifically an orchiopexy, to untwist the spermatic cord and restore blood flow to the testicle. This procedure involves fixing the testicle in place to prevent future torsion.

**Why Each Wrong Option is Incorrect**
**Option A:** Imaging studies such as ultrasound or MRI are not recommended in the initial evaluation of testicular torsion, as they may delay treatment.
**Option B:** Administering pain medication may provide temporary relief but does not address the underlying issue of testicular torsion.
**Option C:** Waiting for an outpatient appointment or further evaluation is not appropriate for a suspected case of testicular torsion, as time is of the essence in preserving testicular function.

**Clinical Pearl / High-Yield Fact**
The "Lightening" sign, where the affected testicle appears higher than the normal testicle, is a classic clinical finding in testicular torsion.

**Correct Answer:** D. Perform an urgent surgical exploration, specifically an orchiopexy, to untwist the spermatic cord and restore blood flow to the testicle.