Cancer of unknown primary

DDx

Poorly differentiated: lymphoma, germ cell tumor, melanoma, neuroendocrine, prostate
Adenocarcinoma: breast, prostate, pancreatic, hepatobiliary, lung, colon, ovarian
Squamous cell (depending on location of adenopathy): head and neck, genital, anorectal, cervical, lung
Others: melanoma, sarcoma, thyroid

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