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Fig. 1A —Contrast-enhanced CT scans of thorax (360° rotation, no cardiac gating) in 45-year-old man evaluated for chronic obstructive airways disease. High-resolution 1-mm-thick axial slices through right upper lobe at level of tracheal bifurcation obtained at lung parenchymal window settings (window center: -600 H; window width: 1,600 H). Thickening of septal lines (arrows) and of peribronchial walls (arrowheads) is characteristic of interstitial pulmonary edema. In certain situations, irregular thickening of lymphatic vessels in interstitium can mimic other diseases such as lymphangitic carcinomatosis or sarcoidosis.