Bronchial atresia

• Apicoposterior segment left upper lobe (50%), right upper lobe (20%), lower lobes (15% each) and right middle lobe (< 5%)
• Central nodule or mass representing mucoid impaction distal to the atretic bronchus (bronchocele)
• Hyperlucency
• Hypoperfusion with paucity of vessels

Differential includes intralobar sequestration, which has an an arterial supply from the aorta