Early treatment for IgG4-related disease may prevent cognitive impairment caused by cerebral vasculitis: A case report and review of the literature

IgG4-related disease (IgG4-RD) is a recently recognized disease entity. A 74-year-old male presented with transient headache. He was diagnosed IgG4-RD by pancreatic biopsy at the age of 72. Magnetic Resonance Imaging (MRI) showed disseminated cerebral microbleeds and microinfarctions in time and space. It suggested cerebral vasculitis, however any causative factor were not confirmed. IgG4-RD rarely causes cerebral vasculitis. This might be a...