[A resected case of intralobar pulmonary sequestration with increased serum tumor markers, CA19-9, CA125 and NCC-ST-439].

A 39-year old female was found to have intralobar pulmonary sequestration with a high serum level of the tumor markers, CA19-9, CA125 and NCC-ST-439. The lesion was located in the left S10 and an aberrant artery from the aorta was noted. After partial resection of the left lower lobe, serum levels of the tumor markers (CA19-9 2418U/ml, CA125 50.3U/ml, NCC-ST-439 13.0U/ml) gradually returned to normal. The half-life of serum CA19-9 was about 7 days. Immunohistochemical analysis revealed that CA19-9 was being produced in the bronchial epithelium of the sequestered lung. Increased serum levels of CA19-9 may be helpful in diagnosing pulmonary sequestration.