[So-called reticulohistiocytic granulomatous encephalitis].

On the basis of clinicomorphological study of 4 observations the authors outline a specific form of granulomatous encephalitis known from the literature as "reticulohistiocytic granulomatous encephalitis". The disease occurs at any age. Its course may be chronic or subacute, less frequently--acute. The process may localize anywhere, with predominant occurrence of the lesion in the periventricular region of the third ventricle. The morphological feature of this encephalitic form is a formation of large foci and microgranulomas from lymphocytes, histiocytes, macrophages, epithelioid cells and microgliacytes. The variants of granulomatous encephalitis distinguished by the ratio of the above-mentioned cellular elements should be considered as an etiologically heterogenic group of inflammatory brain diseases, that are likely to develop due to delayed hypersensitivity.