Okay, let's tackle this question about the treatment of choice for duodenal atresia. First, I need to recall what duodenal atresia is. It's a congenital condition where the duodenum is completely blocked, usually in the first part (D1 or D2). The main presentation is in newborns with bilious vomiting and a "double bubble" sign on X-ray. So the treatment would be surgical, probably some kind of procedure to correct the obstruction.

Now, the options aren't given, but common surgical procedures for this condition include duodeno-duodenostomy, pyloric atresia repair, or maybe a gastrostomy. Wait, duodeno-duodenostomy is a common term here. Let me think. Duodenal atresia is typically managed with a side-to-side duodeno-duodenostomy, which connects the proximal and distal parts of the duodenum. That makes sense because it bypasses the atretic segment. Alternatively, there's also a possibility of a duodenocolic anastomosis, but that's less common.

Wait, but in some cases, if there's a malrotation or other associated issues, the approach might differ. But the standard treatment is definitely the side-to-side anastomosis. So the correct answer should be duodeno-duodenostomy. Let me check the options. If the options are A to D, and one of them is duodeno-duodenostomy, that's the right answer. The other options might include things like gastrostomy (which is not the treatment), pyloroplasty (for pyloric stenosis), or maybe a colostomy.

So the core concept here is that duodenal atresia is a surgical emergency in newborns, requiring surgical correction. The correct procedure is a duodeno-duodenostomy. The incorrect options would be other procedures not indicated for this condition. The clinical pearl is to remember that the "double bubble" sign on X-ray is classic for this condition, and surgery is the mainstay of treatment.

**Core Concept**
Duodenal atresia is a congenital obstruction of the proximal duodenum, typically managed surgically. The treatment of choice is **side-to-side duodeno-duodenostomy**, which bypasses the atretic segment while preserving the pylorus and proximal duodenum.

**Why the Correct Answer is Right**
Duodenal atresia presents with bilious vomiting and a "double bubble" sign on imaging. Surgical correction via **duodeno-duodenostomy** directly addresses the obstruction by anastomosing the proximal and distal duodenum. This preserves normal anatomy, prevents complications like malrotation, and avoids unnecessary resection. The procedure is preferred over end-to-end anastomosis to reduce tension and risk of leakage.

**Why Each Wrong Option is Incorrect**
**Option A:** *Gastrostomy* is incorrect because it does not resolve the mechanical obstruction. **Option B:** *Pyloroplasty* treats pyloric stenosis, not duodenal atresia. **Option C:** *Duodenocolic anastomosis* is reserved for extensive duodenal injuries, not isolated atresia.

**Clinical Pearl / High-Yield

✓ Correct Answer: A. Duodenoduodenostomy