- Diagnosed with ANCA-associated vasculitis (AAV: such as Granulomatosis with Polyangiitis (GPA), Eosinophilic Granulomatosis with Polyangiitis (EGPA) and Microscopic Polyangiitis (MPA)), Primary Angiitis of the Central Nervous System (PACNS), Unclassified vasculitis, Takayasu's Arteritis (TA) or Polyarteritis Nodosa (PAN) before age 18