Case 9 Female, 47 years. Skin of jawShow diagnosis & comments
Nodular melanoma, with small naevus remnant.
Nodular melanoma differs from superficial spreading melanoma in that its intraepidermal component does no spead for 3 or more rete ridges lateral to the lateral border of the deral component. Otherwise, there are no obvious differences. Nodular melanoma is less easily recognized than superficial spreading melanoma, since there is no irregular flat periphery; the lesion presents as a pigmented or skin-coloured papule that may have a quite regular appearance.
In this instance, this very small nodular melanoma (which subsquently metastasized to a lymph node in the parotid region) shows a very few intradermal and junctional naevus nests, so that this melanoma, too, probably originated from a melanocytic naevus.