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Histological sections of the right atrial appendage. A: Hematoxylin-eosin (HE) stain at low magnification. B: Masson’s trichrome (MT) stain at low magnification showing diffuse and extensive myocardial fibrosis. C: HE stain at higher magnification showing capillaries with extravasation of erythrocytes (arrows), active inflammatory infiltrates with some leukocytoclastic changes, and increased deposition of interstitial collagen fiber (arrowheads).
