[Biphasic Pulmonary Blastoma without Recurrence for Six Years After Surgery:Report of a Case]

A 62-year-old man was referred to our hospital for a lung tumor. Computed tomography (CT) of the chest showed a 62×55×68 mm well-circumscribed tumor in the upper lobe of the right lung. A transbronchial lung biopsy was performed, but a diagnosis was not achieved. Positron emission tomography-CT demonstrated intense F-fluorodeoxyglucose uptake in the mediastinal side of the tumor. Surgery was performed under the suspicion of primary lung cancer. The intraoperative pathological examination indicated a non-small-cell carcinoma. Thus, right upper lobectomy and wedge resection of the right lower lobe were performed. Microscopically, the tumor was composed of epithelial components, mimicking fetal lung tissue and embryogenic stroma. Therefore, the tumor was diagnosed as a biphasic pulmonary blastoma (p-StageⅡA). After the post-operative adjuvant chemotherapy, he has remained healthy without recurrence six years after the surgery.