Congenital pyloric stenosis causes: 1. Bilious vomiting 2. Non- bilious vomiting 3. Projectile vomiting 4. Non projectile vomiting 5. Forceful
**Core Concept**
Congenital pyloric stenosis is a condition characterized by the thickening of the pylorus muscle, leading to gastric outlet obstruction. This condition typically presents in infants and is associated with **hypertrophic pyloric stenosis**. The underlying pathophysiology involves the inability of the stomach to empty into the small intestine due to the obstruction.
**Why the Correct Answer is Right**
The correct answer is related to the nature of vomiting in congenital pyloric stenosis. Since the obstruction is at the level of the pylorus, before the ampulla of Vater (where bile enters the intestine), the vomiting is typically non-bilious. The vomiting can be **projectile** due to the forceful contraction of the stomach muscles against the obstructed pylorus.
**Why Each Wrong Option is Incorrect**
**Option A:** and **Option D:** are incorrect because while non-bilious vomiting is correct, the question seems to be looking for a more specific descriptor of the vomiting. **Option B:** is partially correct in stating non-bilious vomiting but does not fully describe the nature of the vomiting.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that congenital pyloric stenosis classically presents with non-bilious, **projectile vomiting**. This symptom, along with a palpable "olive" mass in the right upper quadrant (representing the hypertrophied pylorus), is diagnostic.
**Correct Answer:** C. 3. Projectile vomiting