X-ray feature of pyloric stenosis is –
**Core Concept**
Pyloric stenosis is a condition characterized by the narrowing of the pyloric canal, which is the passage between the stomach and the small intestine. This narrowing is usually due to hypertrophy of the pyloric muscle, leading to gastric outlet obstruction. The diagnosis of pyloric stenosis often involves imaging studies, including X-ray.
**Why the Correct Answer is Right**
The classic radiographic feature of pyloric stenosis is the "double-bubble" sign. This is due to the accumulation of gas in the stomach and the duodenum, which appears as two distinct air-filled structures on the X-ray. The double-bubble sign is a result of the gastric outlet obstruction caused by the narrowed pyloric canal, which prevents normal gastric emptying and leads to the accumulation of gas in the stomach.
**Why Each Wrong Option is Incorrect**
**Option A:** The "ground-glass" appearance is typically associated with pulmonary edema, not pyloric stenosis.
**Option B:** The "halo sign" is seen in cases of pneumoperitoneum, which is not related to pyloric stenosis.
**Option C:** The "egg on a string" sign is a feature of intestinal obstruction, but it is not specific to pyloric stenosis.
**Clinical Pearl / High-Yield Fact**
The double-bubble sign is a classic radiographic feature of pyloric stenosis, but it can also be seen in other conditions, such as duodenal atresia. A high index of suspicion and careful clinical evaluation are necessary to make an accurate diagnosis.
**Correct Answer: C. The "egg on a string" sign is not the correct answer; however, the actual correct answer is not provided. A common correct answer for this question is: C. "Double bubble sign"