NCIt definition : A term that refers to a group of cutaneous 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.;