[Extralobar Sequestration Difficult to Establish Preoperative Diagnosis;Report of a Case].

Pulmonary sequestration is a rare congenital pulmonary anomaly. Here we report a case of extralobar sequestration with calcification. A 34-year-old man was admitted to our department because of a tumor shadow on the chest radiological examination. Computed tomography examination revealed a mass measuring 5 cm above the left diaphragm. The mass contained cysts and calcification. Aberrant vessels were not detected. Teratoma, hamartoma or solitary fibrous tumor were suspected and the surgical treatment was performed. The postoperative pathological diagnosis was extralobar pulmonary sequestration.