Atypical Spitz tumor on pre-existing congenital melanocytic nevus.

Abstract

The difference between benign and malignant melanocytic proliferations is not always clear-cut: Spitz nevus is the most evident expression of this problem. In the past considered a melanoma, it can still lead to clinical suspicion of this diagnosis especially due to the rapid initial growth. Also from a histological point of view there are diagnostic difficulties, of which the numerous terms used to describe lesions of uncertain classification are an expression. The present work describes the case of an atypical Spitz tumor arising at 18 months of age on a congenital melanocytic nevus.