invasion

invasion (in-va´zhun)

1. The beginning or incursion of a disease. 2. Local spread of a malignant neoplasm by infiltration or destruction of adjacent tissue; for epithelial neoplasms, i. signifies infiltration beneath the epithelial basement membrane. 3. Entrance of foreign cells into a tissue, such as polymorphonuclear leukocytes in inflammation. [L. invasio, fr. in-vado, pp. -vasus, to go into, attack]

 

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