malignant melanoma in situ

[ ĭn sītōō, sē- ]

n.

A melanoma limited to the epidermis and composed of atypical melanocytes that may be round with abundant cytoplasm.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.