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Definition of Micrometastasis
1. Noun. The microscopic level action of metastasis, the spread of disease from the primary site to other areas. ¹
¹ Source: wiktionary.com
Medical Definition of Micrometastasis
1. Undetectable spread of cancer outside of the breast that is not seen on routine screening tests. Metastasis is too limited to have created enough mass to be observed. (09 Oct 1997)