Routine antenatal scan at 21 weeks of gestation demonstrated a triangular echogenic mass in the left lower lobe of the fetal lung displacing the heart to the contralateral side and deriving its blood supply from the descending aorta. The neonate at birth was not in any significant respiratory distress. 

Bronchopulmonary sequestration is usually classified as extralobar or intralobar type depending on the presence of independent visceral pleura of the extra lung tissue though in this case, it is difficult to make that distinction.