A Mixed tumor is a tumor that derives from multiple tissue types.[1]
For example, a "Chondroid syringoma" is a cutaneous condition characterized histologically by nests of cuboidal or polygonal epithelial cells in the dermis.[2]:667
and it's of two types : 1-derived from a single germ cell layer that differentiates into more than one cell type 2-derived from more than one germ cell layer(totipotent cells)