Pseudomesotheliomatous carcinoma of the lung with asbestos exposure

A case of peripheral lung carcinoma clinically and anatomically simulating a malignant mesothelioma in a man who had been exposed to silicium as well as asbestos during more than 20 years of employment in industry is presented. Results of the microscopic examination of routine, stained sections were inconclusive and the importance of demonstrating mucin in the neoplastic cells by use of special staining is emphasized.