[Carcinoid tumor of the mediastinum].

A carcinoid tumor of the mediastinum in a man of 58, incidentally detected at a roentgenological examination is described. Its histological structure was identical with that of carcinoids of other localization. The tumor cells contained argyrophilic granules. The patient died 41/2 years after the operation in the presence of extensive lymphogenic and hematogenic metastases. The authors believe that signs such as cellular and nuclear polymorphism, outgrowth of the tumor cells into the capsule, lymph vessels detectable even in limited area should be considered as criteria of malignancy of the neoplasma and the basis for prescription of radiation and chemotherapy.