Cellular infiltration

In biology, cellular infiltration is the migration of cells from their sources of origin, or the direct extension of cells as a result of unusual growth and multiplication. Infiltration results in fairly well-defined foci, irregular accumulations, or diffusely distributed individual cells in the connective tissue and interstices of various organs and tissues. The term is used especially with reference to such changes associated with inflammations and certain types of malignant neoplasms.