Myeloperoxidase-antineutrophil cytoplasmic antibody-associated vasculitis with headache and kidney involvement at presentation and with arthralgia at relapse: A case report

Figure 1 Kidney pathology showing crescentic glomerulonephritis and focal fibrinoid necrosis under a light microscope. A: Hematoxylin and eosin staining, 400 × magnification; B: Periodic acid-Schiff staining, 400 × magnification; C: Periodic Schiff-methenamine silver staining, 400 × magnification; D: Masson trichrome staining, 400 × magnification.

Figure 2 Clinical course, proteinuria, serum creatinine, and anti-myeloperoxidase antibody level in our patient. A: Clinical course and laboratory test findings in our patient; B: Trends of 24-h urinary protein, serum creatinine, and anti-myeloperoxidase antibody titer. GC: Glucocorticoids; PE: Plasma exchange; CTX: Cyclophosphamide; MMF: Mycophenolate mofetil; RTX: Rituximab; Scr: Serum creatinine; UP: 24-h urinary protein or urinary protein; Ab: Antibody; MPO: Myeloperoxidase.