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Subcategories of ILA seen on axial CT images. (A) Nonsubpleural ILA: faint ground-glass abnormality (arrows) in the central and subpleural areas of the lungs but not predominant in the subpleural area. (B) Subpleural nonfibrotic ILA: ground-glass abnormality (arrows) without fibrosis such as bronchiectasis and architectural distortion. (C) Subpleural fibrotic ILA: ground-glass abnormality and linear opacities (arrows), with traction bronchiectasis (arrowheads).
