GASTRO INTESTINAL DISORDERS. Hypertrophic Pyloric Stenosis (HPS) Definition: Hypertrophic pyloric stenosis is a thickening of the pyloric muscle, leading to gastric outlet obstruction in infants. Causes & Risk Factors: Signs & Symptoms: Complications: Diagnosis: Management: Hirschsprung’s Disease Definition: A congenital disorder characterized by absence of ganglion cells in the distal colon, leading to intestinal obstruction due to lack of peristalsis. Causes: Signs & Symptoms: Complications: Diagnosis: Management: Intussusception Definition: A