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Categorizing images on HRCT. (A,B) Lesions in which the solid region could be readily distinguished from the non-solid regions were defined as TL. (C,D) Lesions in which the boundaries between the solid regions and the non-solid regions were unclear and/or the distinction between the solid regions and the non-solid regions were difficult to define were categorized as hazy lesions (HL). HRCT, high-resolution computed tomography; TL, typical lesions.
