<unk>  is an uncommon necrotizing vasculitis of unknown cause that is restricted to vessels of the central nervous system.
Granulomatous angiitis
Bacillary angiomatosis
Episcleritis
Multifocal fibrosclerosis
Lymphangitis carcinomatosa
Benign vascular tumor
Charcot-Bouchard aneurysm
Mycotic aneurysm