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Histopathological examination revealed that an ulcer scar at the distal side had mainly fibrosis ((a) and (c)), while lymphoid follicles, infiltration of monocytes, and neutrophils were more noticeable in the wide ulcer on the proximal side ((b) and (d)). Hematoxylin-eosin staining. Original magnification 40x: (a) and (b); 400x: (c) and (d).
