Several conditions may necessitate a colectomy in children. These include: - Ulcerative Colitis: A chronic inflammatory condition of the colon and rectum. - Crohn's Disease: A type of inflammatory bowel disease that can affect any part of the gastrointestinal tract but may sometimes require removal of portions of the colon. - Familial Adenomatous Polyposis (FAP): A genetic condition causing numerous polyps in the colon that have a high risk of turning into cancer. - Hirschsprung's Disease: A congenital condition where nerve cells are missing in parts of the colon, affecting bowel movements. - Colonic Atresia: A birth defect where part of the colon is missing or closed.