[Neuroendocrine tumor of the extrahepatic bile ducts. Case report and literature review]
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Neuroendocrine neoplasms (NENs) are heterogeneous tumors with a common phenotype. There are two fundamentally different groups of NENs: well differentiated with a low proliferative index, called neuroendocrine tumors (NETs) and poorly differentiated with a hig... ...
