This document discusses intussusception, which is the telescoping of one segment of bowel into an adjacent segment. It provides definitions, etiology, types and pathology, signs and symptoms, differential diagnosis, workup, and treatment options for intussusception. The main points are that intussusception is usually idiopathic or caused by respiratory viruses in infants and young children, presenting with abdominal pain, vomiting, and bloody stools. Diagnosis involves imaging like ultrasound or barium enema. Treatment options include non-surgical reduction techniques like hydrostatic or pneumatic reduction or surgical reduction through manual manipulation or resection.