Intralobar pulmonary sequestration.

The sequestration within the lung of a mass of abnormal pulmonary tissue, the blood supply to which is systemic and not pulmonary, is an uncommon but clinically recognizable entity. The clinical and pathological features are reproduced from case to case with remarkable consistency, and it is important to recognize the condition because it produces symptoms, is amenable to surgical correction, and does not respond to management other than surgical. There are reasonable grounds for regarding the lesion as a congenital abnormality of vascular supply to the lung; the sexes are equally affected, and the left lower lobe is the most frequent site in which the abnormality occurs. Eight previously unreported examples of intralobar pulmonary sequestration are recorded, and the clinical and radiographic features and the pathogenesis are briefly discussed.