[Primary malignant lymphoma of the central nervous system].

Clinical and morphological observation of 56-year-old man with a primary isolated malignant non-Hodgkin's lymphoma of the central nervous system in the hypothalamus, with the formation of metastases in the space of the cerebrospinal fluid and a solitary extraneural metastasis in the epicardium. No generalised lymphoma. The histological classification is discussed. The importance of the cytology of the cerebrospinal fluid to a climical diagnosis is pointed out.