title: 55-year-old man with purpura and foot pain.
authors.affiliation: Mayo School of Graduate Medical Education, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA.
authors.forename: Michael W
authors.initials: MW
authors.lastname: Cullen
authors.forename: Cassie C
authors.initials: CC
authors.lastname: Kennedy
authors.forename: Ulrich
authors.initials: U
authors.lastname: Specks
mesh_terms: D000842:Ankle; D018771:Arthralgia / Q000209:etiology*; D014890:Granulomatosis with Polyangiitis / Q000150:complications / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011693:Purpura / Q000209:etiology*