What is the aerial supply to the segment involved in intralobar sequestration of the lung?

The intralobar sequestration (ILS) accounts for 75 percent of all sequestrations. Usually presents in adolescence or adulthood as recurrent pneumonias. The lung tissue lies within the same visceral pleura as the lobe in which it occurs. Males and females are equally affected. In ILS, the aerial supply usually is derived from the lower thoracic or upper abdominal aoa. Venous drainage is usually to the left atrium pulmonary veins establishing a left to right shunt. Two thirds of the time, the sequestration is located in the paraveebral gutter in the posterior segment of the left lower lobe.