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The various imaging features of MPO-AAV patients with lung involvement in MSCT. Alveolar hemorrhage was the appearance of diffuse pulmonary infiltrates with bilateral opacities, ground-glass, and crazy-paving pattern (A); interstitial lung disease including the five imaging features (B–F); pulmonary granuloma surrounded with halo sign, manifested as a nodule, mass, or cavity and ranged from a few millimeters to more than 10 cm in diameter (G); bilateral pleural effusion (H).
