RT Book, Section A1 Stone, John H. A2 Stone, John H. SR Print(0) ID 1180197326 T1 Granulomatosis with Polyangiitis T2 Current Diagnosis & Treatment: Rheumatology, 4e YR 2021 FD 2021 PB McGraw Hill PP New York, NY SN 9781259644641 LK accessmedicine.mhmedical.com/content.aspx?aid=1180197326 RD 2024/04/23 AB Three pathologic hallmarks: granulomatous inflammation, vasculitis, and necrosis.Classic clinical features are found in multiple organ systems:Nonspecific constitutional symptoms, such as fatigue, myalgias, weight loss, and fevers.Migratory pauciarticular or polyarticular arthritis.Persistent upper respiratory tract and ear “infections” that do not respond to antibiotic therapy.Orbital pseudotumor, nearly always associated with chronic nasosinus conditions.Nodular or cavitary lung lesions that are misdiagnosed initially as malignancies or infections.Rapidly progressive glomerulonephritis.Antineutrophil cytoplasmic antibody (ANCA) assays are extremely helpful in diagnosis but have significant shortcomings as indicators of disease activity or guides to when to treat. A significant minority of patients with granulomatosis with polyangiitis are ANCA negative, particularly those with “limited” disease.