Spontaneous regression of intralobar pulmonary sequestration during the pregnancy: report of two cases through relationships between mass and fetal biometry and review of the literature.

Intralobar pulmonary sequestration is a rare bronchopulmonary malformation consisting of a non-functioning lung mass that receives its arterial blood supply from systemic circulation and that does not adequately communicate with the tracheobronchial tree through a normal bronchus. These sequestrations account for 1.1-1.