A stage of metastasis when the secondary tumors are too small to be clinically detected, as in micrometastatic disease.
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mi·cro·me·tas·ta·sis .mī-krō-mə-'tas-tə-səs n, pl -ta·ses -.sēz the spread of cancer cells from a primary site and the formation of microscopic tumors at secondary sites also one of those microscopic tumors
mi·cro·met·a·stat·ic -.met-ə-'stat-ik adj
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n.
a secondary tumour that is undetectable by clinical examination or diagnostic tests but is visible under the microscope.
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mi·cro·me·tas·ta·sis (mi″kro-mə-tasґtə-sis) the spread of cancer cells from the primary tumor to distant sites, where they form microscopic secondary tumors.Medical dictionary. 2011.