Table 4

Melanocytic lesions that characteristically or occasionally show a spindle cell cytomorphology

Lesions that characteristically or commonly show spindle cellsLesions that occasionally show spindle cells
Naevoidal pattern

  • Neuroidal naevus

  • Naevus with desmoplasia

  • Spindle cell melanoma

  • Congenital naevus

  • Naevi of special sites

  • Naevoidal melanoma

  • Nodular melanoma

Spitzoid lesions

  • Spitz naevus

  • Atypical Spitz tumour

  • Spitzoid melanoma

  • Pigmented spindle cell naevus (of Reed)

  • Atypical pigmented spindle cell naevus

Intradermal proliferations

  • Dermal melanocytoses

  • Common blue naevus (and variants)

  • Cellular blue naevus

  • Cellular blue naevus with Satellitic nodules

  • Atypical blue naevus

  • Malignant blue naevus

  • Deep penetrating naevus

  • Spindle cell plexiform naevus

  • Cutaneous neurocristic hamartoma

  • Desmoplastic naevus/desmoplastic Spitz naevus

  • Desmoplastic/neurotropic melanoma

  • Melanocytoma

  • Paraganglioma-like dermal melanocytic tumour

  • Primary dermal melanoma

  • Metastatic melanoma

Horizontally oriented lesions

  • Clark's naevus with Spitzoid morphology (‘SPARK’ naevus)

  • Melanoma in situ of the solar type (‘lentigo maligna’)

  • Melanoma of the solar type (‘lentigo maligna melanoma’)

  • Clark's naevus (‘dysplastic’ naevus)

  • Recurrent naevus phenomenon

  • Sclerosing naevus with pseudomelanomatous features

  • Traumatised or treated naevi

  • Naevi associated with inflammatory dermatoses

  • Melanoma in situ

  • Superficial spreading melanoma

  • Acral lentiginous melanoma

  • Vulvar melanoma

Mixed pattern lesionsCombined naevus
Undefined pattern lesionsMelanocytic lesion of undetermined malignant potential (‘MELTUMP’)