Pyloric Stenosis, Infantile Hypertrophic, 1, also known as pyloric stenosis, infantile hypertrophic 1, is related to pyloric stenosis, infantile hypertrophic, 5 and pyloric stenosis, infantile hypertrophic, 4. An important gene associated with Pyloric Stenosis, Infantile Hypertrophic, 1 is NOS1 (Nitric Oxide Synthase 1). Affiliated tissues include smooth muscle and small intestine, and related phenotypes are failure to thrive and pyloric stenosis