[Angiitis of the CNS (and the problem of its classification)].

The author deals with the different and partially divergent aspects of the classification of inflammatory vascular processes with particular reference to cerebrospinal involvement and forms. The limited pathomorphic tissue reaction of vessel wall elements and blood cells to different etiopathogenetic factors and the different cellular tissue structures observed for similar noxae are especially worth mentioning in this context. Also pointed out by the author in his present paper are the limitations of diagnosis. Central-nervous-system involvement usually brings with it special topographic difficulties and problems.