All correlates with USG findings of pyloric stenosis except –
**Core Concept**
Pyloric stenosis is a condition characterized by the narrowing of the pyloric channel, leading to gastric outlet obstruction. It is often associated with hypertrophy of the pyloric muscle and elongation of the pyloric canal.
**Why the Correct Answer is Right**
In pyloric stenosis, ultrasound (USG) findings typically include a thickened pyloric muscle (greater than 4 mm), a narrowed pyloric channel, and an elongated pyloric canal. These findings are due to the hypertrophy of the pyloric muscle, which causes the channel to narrow and elongate. The clinical presentation of pyloric stenosis often includes projectile vomiting, weight loss, and dehydration.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not directly related to the USG findings of pyloric stenosis. However, an annular pancreas can cause gastric outlet obstruction, but it is not typically associated with the specific USG findings of pyloric stenosis.
* **Option B:** Alkalosis is a metabolic complication of pyloric stenosis due to prolonged vomiting, but it is not a USG finding.
* **Option C:** Hypokalemia is another metabolic complication of pyloric stenosis due to prolonged vomiting, but it is not a USG finding.
* **Option D:** This option is incomplete. If you provide the rest of the options, I can give a proper explanation.
**Clinical Pearl / High-Yield Fact**
The "rule of threes" is a useful mnemonic for remembering the USG findings of pyloric stenosis: thickened pyloric muscle (greater than 4 mm), narrowed pyloric channel, and elongated pyloric canal.
**Correct Answer:**