Abstract
A case of primary lung cancer with stromal ossification is reported. A 61-year-old man had been known to have an abnormal shadow in the left lower field on chest roentgenogram for five years. Left lower lobectomy with tumor was performed, and adenocarcinoma was diagnosed based on the resected tumor. The stroma of the tumor showed islands of osseous tissue adjacent to carcinoma cells, which were thought to be induced by the adenocarcinoma tissue. As far as we know, previous reports of ossification associated with primary lung cancer other than carcinoid are extremely rare.
