Fig. 4
From: Melanocytic tumors with MAP3K8 fusions: report of 33 cases with morphological-genetic correlations
Malignant Spitz tumors with MAP3K8 fusion. a Large exophytic, wedge-shaped proliferation infiltrating deeply into the dermis. b Close-up view of a. Large epithelioid, unpigmented melanocytes with scattered mitotic figures. c Exophytic, mainly dermal proliferation with broad superficial ulceration. Cellular sheets and fascicles of large spindled melanocytes. d–f High-power detail of multiple large multinucleated melanocytes reaching up to 200 microns in size in f
