title: [Series: Let's think-clinical quiz (question): A 45-year-old man who was admitted because of arthralgia, sinusitis, and fever].
authors.affiliation: Department of Bioregulatory Medicine, Ehime University Graduate School of Medicine, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Hasegawa
mesh_terms: D014890:Granulomatosis with Polyangiitis / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged