- Bronchogenic cysts are abnormal pouches that develop from the tracheobronchial tree during fetal development. They typically occur in the mediastinum but can also be found in the lung parenchyma. - A bronchogenic cyst has infradiaphragmatic arterial blood supply rather than a systemic arterial supply like a pulmonary sequestration. - Intussusception is most commonly ileocolic, with the ileum telescoping into the cecum, rather than being colo-colic.