[Case of overlapping cancers complicated with sarcoidosis].

A 74-year-old man presented with left chest pain. He had been given a diagnosis of sarcoidosis at age 65. Chest CT films on admission revealed a mass shadow in the left lower lung field and a small nodule in the left upper lung field. Because the specimens of transbronchial biopsy were not diagnostic, video-assisted thoracoscopic surgery was performed. The pathologic diagnosis of the resected lung was overlapping cancers (large cell neuroendocrine carcinoma and mucosa-associated lymphoid tissue lymphoma) complicated with sarcoidosis. Adjuvant chemotherapy was not performed. One year after surgery he continues to do well and has no evidence of recurrence.