microsatellite tumor

Pronunciation: (MY-kroh-SA-teh-lite TOO-mer)

A small group of tumor cells in an area beside or below, but separate from, the primary (original) melanoma. Microsatellite tumors can only be seen with a microscope. Having a microsatellite tumor is a sign that the melanoma has spread from where it first formed.

Source: NCI Dictionary of Cancer Terms