micrometastasis

noun
mi·cro·me·tas·ta·sis | \ ˌmī-krō-mə-ˈtas-tə-səs \
plural micrometastases\-ˌsēz \

Medical Definition of micrometastasis 

: the spread of cancer cells from a primary site and the formation of microscopic tumors at secondary sites also : one of those microscopic tumors resulting from micrometastasis

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