X-ray feature of pyloric stenosis is: March 2013
**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 can lead to obstruction of food passage, causing symptoms such as vomiting. The diagnosis of pyloric stenosis can be aided by imaging studies, including X-rays.
**Why the Correct Answer is Right**
The correct answer is related to the characteristic X-ray finding in pyloric stenosis, which is the presence of a distended stomach with a narrow pyloric canal. This appearance is often described as an "olive" due to the shape of the narrowed pylorus. The X-ray feature is a result of the mechanical obstruction caused by the thickened pyloric muscle.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not accurately describe the typical X-ray findings in pyloric stenosis.
**Option B:** This option is also incorrect as it does not relate to the characteristic X-ray feature of pyloric stenosis.
**Option C:** This choice is incorrect because it is not a recognized X-ray feature of pyloric stenosis.
**Option D:** This option is incorrect as it is not relevant to the X-ray diagnosis of pyloric stenosis.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that pyloric stenosis typically presents with projectile vomiting in infants, and the diagnosis can be confirmed by ultrasound or X-ray findings of a narrowed pyloric canal.
**Correct Answer:** Correct Answer: D. String sign or olive sign.