title: Letter: Wegener's granulomatosis.
mesh_terms: D003937:Diagnosis, Differential; D006103:Granuloma, Lethal Midline / Q000175:diagnosis* / Q000473:pathology; D014890:Granulomatosis with Polyangiitis / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008223:Lymphoma / Q000175:diagnosis* / Q000473:pathology