[A case report of intralobar sequestration with a Mycobacterium tuberculosis infection limited to the sequestrated lung].

A 22-year-old woman was referred to our hospital suffering from repeated exacerbation of infiltrates confined to the medial portion of the right lower lung lobe, suggestive of pulmonary sequestration. Angiography revealed an anomalous vessel originating from the left side of the descending aorta, flowing behind it into the right lower lobe, the blood being returned to the pulmonary veins. A resection of the right lower lobe was conducted via thoracotomy. However, since there was no clear normal lung-pleura interface, this was classified as Pryce II type intralobar sequestration. Epithelioid granulomas with associated caseation necrosis confined to the sequestrated lung were confirmed by a polymerase chain reaction as Mycobacterium tuberculosis. Following oral antituberculosis drug administration, the patient recovered uneventfully. Superimposition of tuberculosis confined to a sequestrated lung portion is extremely rare. The presence of the aberrant artery led us to conclude that the intralobar sequestration must have been congenital.