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Pathological features of MSI-H colorectal cancer A: Tumor-infiltrating lymphocytes Numerous intra-epithelial lymphocytes showing clear halos. B: Medullary carcinoma Tumor showing a solid growth pattern without glandular structure. C: Mucinous adenocarcinoma showing prominent extracellular mucin. D: Crohn’s-like lymphoid reaction characterized by peritumoral lymphocytic aggregates.
