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(a) Photomicrograph of the initial biopsy of a caecal polyp shows tubular adenoma with low-grade dysplasia (Haematoxylin & eosin, × 100). (b) Photomicrograph of the subsequent endoscopic mucosal resection specimen shows an increase in gland architecture complexity and nuclear cytological grade in the excised tubulovillous adenoma, consistent with high-grade dysplasia (Haematoxylin & eosin, × 100).
