invasion[in-vā′zhŭn]

Type:Term

Definitions
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, invasion signifies infiltration beneath the epithelial basement membrane.
3. Entrance of foreign cells into a tissue, such as polymorphonuclear leukocytes in inflammation.

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