Abstract
Dense fine nodular opacities were seen on chest X-rays of a hard metal worker aged 40. He had been highly exposed to hard metals including tungsten as a shaper for 24 years. The diffuse shadows in the lung appeared to be due to much hard metal accumulated in the lung. The case was diagnosed as pneumoconiosis due to inhalation of hard metal. He also suffered from chronic bronchitis. He died of giant cell carcinoma of the lung.
