Photomicrograph (original magnification, x100; hematoxylin-eosin stain) showing the characteristic histologic features of RB-ILD. Pigmented macrophages in a terminal bronchiole and the adjacent alveoli (arrows), and moderate peribronchiolar inflammation and fibrosis (arrowhead) are present. *Mueller-Mang C, Grosse C, Schmid K, et al.: What every radiologist should know about idiopathic interstitial pneumonias. Radiographics 2007, 27:595–615. With permission from The Radiological Society of North America.