[Primary carcinomas and carcinomatous disease].

The occurence rate of multiple primary tumours is assessed differently by different authors (from 0.3 to 8%). Simultaneous plurality is seen essentially in a system of the same structure. It is nevertheless often difficult to distinguish a new and second or third tumour from metastases of the first. The articel analyses the statistics obtained in a series of 288 cases of malignant "primo plural" neoplasms appearing successively.