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Adenocarcinomas metastatic to the liver

Metastatic adenocarcinoma in the liver with an unidentified primary tumor site is a common clinical problem. Pathologists often are asked to identify the primary tumor site. The histologic picture itself usually is not helpful, because the histology may be similar in the metastases of tumors with different primary localizations. Immunohistochemistry can be helpful, but the previously recommended antibody panels are too complicated for everyday use.