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Metastatic Malignant Neoplasm of Unknown Primary Origin
Definition 1
The spread of a malignant neoplasm from an unknown primary to another region remote from the primary site. (NCI Thesaurus)
Definition 2
Cancer in which the site of the primary (original) tumor cannot be found. Most metastases from occult primary tumors are found in the head and neck. (NCI Dictionary)
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