Figure 6a. Histologic features of NSIP. (a) Photomicrograph (original magnification, x100; hematoxylin-eosin stain) of cellular NSIP shows a uniform appearance of interstitial inflammation (arrow), which consists of lymphocytes and plasma cells. (b) Photomicrograph (original magnification, x100; hematoxylin-eosin stain) of fibrosing NSIP shows areas of fibrosis (arrow) in addition to uniform inflammation.