Figure 2

Scanning view and low-power image of the polyp. (H & E) The scanning view and low-power image of Hematoxylin-eosin (H & E) staining demonstrate that the lesion is covered by hyperplastic foveolar-type epithelium with focally distorted or cystically dilated change, supported by abundant edematous fibrovascular stroma without apparent invasive components (left upper), and small irregular and fused tubular areas are found in the hyperplastic polyp (left lower). (CA19-9) The scanning view and lower-power image of immunohistochemical staining of CA19-9 on its sequential section show a focal, not diffuse, positive-expression in the hyperplastic epithelium and, especially, in the irregular and fused tubular glands (right lower) and the secreted mucinous material into the dilated glands (right upper).