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Comparison of annual decline rate of lung volume from baseline calculated from three-dimensional computed tomography data between patients with MPO-ANCA nephritis with a UIP pattern and IPF. (a) Net lung volume decline and (b) percent lung volume decline. MPO-ANCA, myeloperoxidase anti-neutrophil cytoplasmic antibody-related nephritis; UIP, usual interstitial pneumonia; IPF, idiopathic pulmonary fibrosis
