Figure 2. Histopathological findings and CT image: (A) Histological sections showing lung tissue with light-colored interstitial nodules of fibroblast proliferation immersed in an extracellular edematous matrix, some of them occupying the alveolar lumen (arrows); (B) Injury to the epithelium of the terminal bronchiole with interstitial fibroblastic proliferation nodule partially occluding its lumen (plugs) (arrow); (C) Multiple light-colored fibroblastic nodules distending the septal interstitium and occupying the air spaces with atelectasis of adjacent pulmonary tissue; (D) Tomographic image obtained 2 weeks before the biopsy showing multiple centrilobular pulmonary nodules and a dense triangular elongated band based on parietal pleura assigned to atelectasis (arrow). The histological findings characterize an organizing pneumonia pattern; no infectious organisms or viral cytopathic changes were identified. CT – computed tomography.