[A case of carcinomatous lymphangitis of the lungs due to stomach cancer responding to TS-1].

We report a case of carcinomatous lymphangitis of the lungs due to and stomach cancer showing remarkable response to TS-1. The patient was a 51-year-old man whose chest x-ray and computed tomography (CT) revealed lymphangitis, and endoscopic examination showed stomach cancer on posterior wall of stomach body. Bone marrow metastasis was suspected because platelet count was 50/microliter, and myelocytes and metamyelocytes emerged in peripheral blood. TS-1 80 mg/day was administered orally for 28 days as 1 course. After 4 courses of TS-1, chest x-ray showed remarkable improvement, and platelet count was normalized. The patient survived for 10 months after the first visit. We suggest that TS-1 is an effective therapy for carcinomatous lymphangitis of the lungs due to stomach cancer.