title: Case 18-1987.
authors: J
authors: J
authors: Churg
mesh_terms: D003937:Diagnosis, Differential; D006099:Granuloma / Q000175:diagnosis*; D014890:Granulomatosis with Polyangiitis / Q000175:diagnosis*; D006801:Humans; D006967:Hypersensitivity / Q000175:diagnosis*; D018366:Vasculitis, Leukocytoclastic, Cutaneous / Q000175:diagnosis