Figure 5 | Modern Pathology

Figure 5

From: Smoking-related interstitial fibrosis (SRIF), pathogenesis and treatment of usual interstitial pneumonia (UIP), and transbronchial biopsy in UIP

Figure 5

SRIF and respiratory bronchiolitis (RB). (a) Low magnification showing RB with clusters of intra-alveolar pigmented macrophages in background of SRIF. (b) Higher magnification of the same area showing mucin and pigmented macrophages within an alveolar duct and surrounding airspaces that are characteristic of RB. Note the associated uniform and bland appearing interstitial fibrosis typical of SRIF. (c) Another case illustrating accumulation of pigmented macrophages within airspaces associated with the typical hyalinized alveolar septal fibrosis (d).

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