Fig. 5.

Organizing pneumonia in a 56-year-old woman with dermatomyositis. (a, b) Lung window images of CT scans obtained at levels of liver dome (a) and 3 cm inferior to a (b), respectively, show patchy distribution of consolidation along bronchovascular bundles (arrows) and subpleural lungs (open arrows) in both lungs. (c) Coronal reformatted image demonstrates consolidation along bronchovascular bundles (arrows) and subpleural (open arrows) lungs. (d) Low power magnification of lung demonstrating organizing pneumonia (arrows) transitioning to fibrosing NSIP (arrowheads). CTD is in the etiologic differential of fibrosing NSIP, but there are no histologic findings in this images that suggest CTD as the underlying cause in contrast to the lymphoid follicles with reactive germinal centers in Fig. 1, Fig. 2, Fig. 3.