Pyloric Stenosis Feature Analysis

Congenital hypertrophic pyloric stenosis (CHPS) is a condition affecting infants where the pyloric muscle (connecting the stomach to the small intestine) becomes abnormally thick, obstructing food passage.

Identifying Non-Characteristic Symptoms

We need to find the option that is not a typical feature of CHPS. Let's examine the common signs:

• Prevalence in Males: CHPS is known to be significantly more common in male infants.
• Projectile Vomiting: This is a hallmark symptom. The obstruction causes forceful, often long-distance, vomiting shortly after feeding, without much nausea.
• Malnutrition: Persistent vomiting prevents adequate nutrient and fluid intake, leading to dehydration, weight loss, and malnutrition if untreated.
• Diarrhea: This is less common in CHPS. The primary issue is obstruction, leading to reduced passage of stool (constipation) due to decreased intake and absorption. Diarrhea might occur secondary to other complications or unrelated issues but isn't a direct feature of the stenosis itself.

Conclusion

Based on the typical presentation of CHPS, Diarrhea is the symptom that does not align with the condition's primary characteristics. The other options are well-established features.