Skin - Melanocytic tumor
Melanoma
Primary dermal melanoma

Author: Christopher Hale, M.D. (see Authors page)

Revised: 20 February 2017, last major update May 2013

Copyright: (c) 2002-2017, PathologyOutlines.com, Inc.

PubMed Search: Primary dermal melanoma

Cite this page: Primary dermal melanoma. PathologyOutlines.com website. http://pathologyoutlines.com/topic/skintumormelanocyticprimarydermalmelanoma.html. Accessed February 22nd, 2017.
Definition / General
  • Extremely rare
  • Melanoma subtype confined to dermis or subcutis
Epidemiology
Sites
  • No apparent site predilection
Clinical Features
  • Solitary and well circumscribed but unencapsulated, deep dermal or subcutaneous melanoma
Case Reports
Treatment
  • Prolonged survival (Arch Dermatol 2004;140:99) compared to melanoma of similar thickness but may recur or develop metastases
Dermoscopy
  • Lack of atypical pigmented network and radial streaks; papillomatous projections with light brown and dark brown blotchy areas (Am J Dermatopathol 2009;31:574)
Clinical Images

Images hosted on other servers:

Blue nodule on arm

Slightly bluish scalp nodule

Micro Description
  • Melanoma confined to dermis or subcutis; mean Breslow depth is 1 cm
  • No in situ component, regression or ulceration
  • No associated nevus
Micro Images

Images hosted on other servers:

Various images

Metastatic melanoma vs. primary dermal melanoma

Positive Stains
Molecular / Cytogenetics Description
  • Strong expression of KIT (CD117) by immunohistochemistry but no EWS / ATF1 fusion transcript (J Dermatol 2009;36:346)
Differential Diagnosis