Non-specific interstitial pneumonia showing a "crazy paving" pattern on high resolution CT

Non-specific interstitial pneumonia is characterized pathologically by unif orm interstitial inflammation and fibrosis. This disease is most commonly d emonstrated on high resolution CT as subpleural ground-glass opacity mixed with irregular linear opacities. The authors report a case of non-specific interstitial pneumonia with high resolution findings consistent with a "cra zy paving pattern". This appearance, represented by smoothly thickened inte rlobular septa with a background of geographic areas of ground-glass opacit y, is unusual for non-specific interstitial pneumonia and was indistinguish able from other interstitial or alveolar lung diseases.