PMC5760708_01
Macroscopic appearance of the opened resection specimen showing the mucosal surface involved by a lesion protruding from the mucosa covered with mucin.
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The specimen is opened through the previously described patent opening to reveal a friable tan-pink papillary mass (Fig. 1) partially surfaced by clear mucoid material measuring 3.5 x 3.0 cm.
Fronds of villous adenoma, H&E 10X.
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The mass that protrudes from the surface of the mucosa is a villous adenoma, similar to that seen in the colon (Fig. 2).
Villous adenoma with high-grade dysplasia bordering on adenocarcinoma in situ.
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There are features of high-grade dysplasia, bordering on adenocarcinoma in situ (Fig. 3).