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Fig. 3. —Lymphocytic interstitial pneumonia in 49-year-old woman. High-resolution (1-mm-collimation) CT scan obtained at level of tracheal carina shows several thin-walled cystic air spaces (large arrows) and thickened bronchovascular bundles (small arrows). Note poorly defined centrilobular nodules, areas of ground-glass attenuation, and thickening of interlobular septa (arrowheads).