NCIt definition : A term that refers to a group of melanocytic neoplasms that are composed of epithelioid
and/or spindle cells and extend from the epidermis into the reticular dermis, often
in a wedge-shaped configuration. They are usually associated with oncogenic mutations
that activate the MAP-kinase pathway. This category includes Spitz nevus, Spitz melanocytoma,
and Spitz melanoma.;