has part has part characteristic of inheres in has modifier Pyloric stenosis Infantile hypertrophic pyloric stenosis Fyler:4444 HP:0002021 Pyloric stenosis occurs in the first few months of life. Pyloric stenosis, also known as infantile hypertrophic pyloric stenosis, is an uncommon condition in infants characterized by abnormal thickening of the pylorus muscles in the stomach leading to gastric outlet obstruction. Clinically infants are well at birth. Then, at 3 to 6 weeks of age, the infants present with projectile vomiting, potentially leading to dehydration and weight loss. SNOMEDCT_US:367403001 Pylorus stenosis MEDDRA:10037621 UMLS:C0034194 Abnormality of the pylorus abnormal constricted pyloric antrum