Expression of bone morphogenetic protein 2 in lung adenocarcinoma with ossification

: We report a case of primary lung cancer with ossification. A 69-year-old woman was referred to our hospital due to an abnormal shadow on a chest roentgenogram. Chest computed tomography demonstrated an irregular mass with scattered high-density areas in the left lower lung. Excisional biopsy of the mass revealed lung adenocarcinoma, and we performed left lower lobectomy. Histologic examination revealed the tumor to be a papillary adenocarcinoma with ossification. We confirmed that bone morphogenetic protein(BMP)-2 developed from the tumor by a western blot analysis.