[A case of stomach metastasis of pleomorphic carcinoma of the lung with hypercalcemia].

A 69-year-old man was admitted with fatigue, anorexia, and slight fever. Gastroscopy showed a tumor in the stomach, and biopsy revealed a poorly differentiated adenocarcinoma. CT scan revealed a tumor of the stomach, a tumor in the lower lobe of the right lung, and multiple tumors in the liver. Moreover, he was drowsy, probably caused by severe hypocalcemia thought to be caused by parathyroid hormone related protein. We treated him with S-1, but the gastric tumors progressed rapidly and massive pleural effusion developed. He died on the 16th day after admission. At autopsy, the histology of the lung tumor was found to be pleomorphic carcinoma, and that had metastasized to the stomach, the liver, and other abdominal organs. We treated a rare case of pleomorphic carcinoma with hypercalcemia that was discovered due to gastric metastasis.