microinvasion

[ mī′krō-ĭn-vāzhən ]

n.

Invasion of in situ carcinoma into tissue that is immediately adjacent, being the earliest stage of malignant neoplastic invasion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.