Synchronous Appearance of a High-Grade Neuroendocrine Carcinoma of the Ampulla Vater and Sigmoid Colon Adenocarcinoma
Neuroendocrine carcinoma of ampulla of Vater. (a)-(b) Neuroendocrine tumor invading muscularis propria in the ampulla, (c) focal necrosis centres and moderate atypia in the tumor, (d) Ki-67 proliferation index above 20%, (e) focal positivity with synaptophysin.
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