[Multiple neoplasms].

This paper describes observation on multiple carcinomas, with emphasis on double carcinomas of the lungs and other organs. The paper presents four cases of multiple neoplasmas and goes on to discuss eventual etiopathogenesis of multiple malignancies. Of the four cases presented in this paper, three cover double carcinoma of the throat and lungs, and in the fourth, double carcinoma of the lung and bladder. Three of the cases covered relate to metachronous carcinoma and the fourth case to synchronous carcinoma.