Treatment of choice of this 3-year-old child with an irreducible lump in right scrotum with trans- illuminance positive.
**Core Concept**
The child in question is likely suffering from a testicular torsion or, more likely given the irreducible lump and transillumination, a testicular tumor, but the most common cause of an irreducible lump in a child is a testicular torsion. The key concept here is the need for prompt diagnosis and treatment of this condition to prevent ischemia and potential loss of the testicle.
**Why the Correct Answer is Right**
The correct treatment for an irreducible lump in the scrotum with transillumination positive in a child is orchiectomy. This is because the underlying cause is likely a testicular tumor, such as a teratoma, which requires surgical removal. Orchiectomy involves surgical removal of the affected testicle, which is the definitive treatment for testicular tumors. The other options, such as ultrasound or antibiotics, would not address the underlying cause of the irreducible lump.
**Why Each Wrong Option is Incorrect**
**Option A:** Ultrasound is a diagnostic tool that can help identify the cause of the irreducible lump, but it is not a treatment option.
**Option B:** Antibiotics are used to treat bacterial infections, but an irreducible lump in the scrotum with transillumination positive is unlikely to be caused by a bacterial infection.
**Option C:** Testicular torsion is a potential diagnosis, but it is typically characterized by a sudden onset of pain, and the lump would be reducible.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that an irreducible lump in the scrotum with transillumination positive in a child requires prompt surgical evaluation to rule out a testicular tumor. The "5Ds" of testicular torsion (sudden onset of pain, swelling, discoloration, detorsion, and Doppler ultrasound) can be remembered to help diagnose this condition.
**Correct Answer:** D. Orchiectomy.