Fig. 13
From: Fibrosing pneumonia – how to diagnose, and how to recognize the etiology?
Case of an autoimmune disease, probably SLE; a and b shows two different areas, one with LIP, the other with alveolar hemorrhage; in c-e) there is a pattern which looks like LIP, but it could also be called NSIP; but as there is also BALT hyperplasia, which is uncommon in NSIP; in e and f) there is fresh hemorrhage but also are siderin-laden macrophages; g and h) shows deposition of immune complexes (g) and activation of the full complement cascade (h; C5–9 complex). H&E and immunohistochemistry for IGG and C5–9, bars 200, 100, 50, 20 μm, respectively