[A case of malignant pleural mesothelioma with infectious bronchogenic cyst].

A 47-year-old man was admitted with a cough on January 4, 1986. A chest X-ray film showed a mass shadow in the left lower lung, which was revealed to be a bronchogenic cyst by CT scanning and ultrasonography. Thoracotomy was performed on March 3, 1986 because cytologic tests on the fluid in the cyst suggested malignancy. A cyst, two tumors on the diaphragm and pleural thickening were revealed. Microscopic examination showed a benign bronchogenic cyst and a mixed-type malignant mesothelioma. In spite of chemotherapy (ADR, Cis-DPP, 5-fluorouracil) and immunotherapy (OK-432, PSK), the pleural thickening progressed, as was demonstrated by CT scanning and ultrasonography. Although cardiac tamponade due to invasion by the malignant mesothelioma developed, this was improved by cardiocentesis. The patient died of pneumonia on March 28, 1987. We studied the concentration of mineral fibers in lung and tumor tissues of this case by Energy Dispersive X-ray Analyser because asbestos or non-asbestos inorganic fibers might cause malignant mesothelioma. This case of malignant pleural mesothelioma accompanied by a bronchogenic cyst is very rare.