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Examples of invasive mucinous cystadenocarcinoma (A) and in situ cystadenocarcinoma (B). (A) Mucinous cystadenocarcinoma, resected specimen showing the thin fibrous pseudocapsule; in (B) a precursor lesion, mucinous cystadenoma, borderline variant is shown. This in essence is an in situ mucinous cystadenocarcinoma. H&E ×25.
