Mucinous adenocarcinoma

(A) Gastrointestinal-type mucinous adenocarcinoma. Note the destructive stromal invasion and irregular, angulated glands.
(B) Gastrointestinal-type mucinous adenocarcinoma with prominent goblet cells.
(C) High-grade intraepithelial neoplasia in gastrointestinal-type mucinous adenocarcinoma. The high cytologic grade and mitotic activity are characteristic of high-grade intraepithelial neoplasia, but no invasive carcinoma is seen in this field.