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Systemic sclerosis illustrated; a UIP pattern was present with myofibroblastic foci (single arrows) and remodeling (A, B, C, D); in (B) the intimate association of lymphocytes with a myofibroblastic focus (single arrow) is a significant feature pointing to an immune disorder with UIP pattern. In (D), the myxoid changes of the intima (double arrow) are seen in a middle-sized pulmonary artery. H&E, bars 100, 50, 20 µm
