PRTN3 and eosinophilic granulomatosis with polyangiitis: Eosinophilic granulomatosis with polyangiitis (EGPA, also known as Churg–Strauss Syndrome) is a rare type of vasculitis with eosinophilic granulomatous inflammation and necrosis of small-medium blood vessels, associated with c-ANCA positivity in 40–60% of cases [27,28].