"Granulomatosis with polyangiitis (previously known as Wegener granulomatosis), is a multi-system systemic necrotising non-caseating granulomatous vasculitis affecting medium to small-sized arteries, capillaries, and veins."
"There are no pathognomonic radiographic features of CNS granulomatosis with polyangiitis. Manifestations such as hypertrophic pachymeningitis, CNS vasculitis, and intracranial haemorrhage have imaging characteristics that are shared by other aetiologies of those entities 5, thus, see those individual articles for detailed discussion."