Which of the following sign is not seen in hypertrophic pyloric stenosis
**Core Concept**
Hypertrophic pyloric stenosis is a condition characterized by the thickening of the pylorus muscle, leading to gastric outlet obstruction. This condition is often diagnosed in infants and is associated with specific clinical signs. The **pathophysiology** involves hypertrophy of the pyloric muscle, causing narrowing of the pyloric channel.
**Why the Correct Answer is Right**
The correct answer is related to the typical presentation of hypertrophic pyloric stenosis, which includes symptoms such as projectile vomiting, palpable mass in the epigastric region (olive-sized mass), and metabolic disturbances like hypochloremic alkalosis.
**Why Each Wrong Option is Incorrect**
**Option A:**
**Option B:**
**Option C:**
**Clinical Pearl / High-Yield Fact**
A key point to remember is that hypertrophic pyloric stenosis typically presents with non-bilious vomiting, which differentiates it from other causes of vomiting in infants.
**Correct Answer: D.**