Skin melanocytic tumor
Melanoma
Lentiginous melanoma


Topic Completed: 1 May 2013

Revised: 5 April 2019

Copyright: 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Lentiginous melanoma

Christopher S. Hale, M.D.
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Cite this page: Hale CS Lentiginous melanoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/skintumormelanocyticlentiginousmelanoma.html. Accessed September 23rd, 2019.
Definition / general
  • Rare subset of slowly progressing, radial growth phase melanoma with lentiginous proliferation of moderately atypical epithelioid melanocytes, focal pagetoid spread and nesting; not associated with architectural changes at dermoepidermal junction (Arch Pathol Lab Med 2011;135:337)
  • First described in 2005 (Mod Pathol 2005;18:1397)
  • May remain in situ for prolonged periods before invasion
  • May be an analogue of lentigo maligna on mild / moderately sun damaged skin (J Cutan Pathol 2007;34:296)
  • May recur locally
  • Distinct from acral lentiginous melanoma, lentigo maligna and superficial spreading melanoma
Epidemiology
Sites
Microscopic (histologic) description
  • Broad lentiginous proliferation of melanocytes at dermoepidermal junction, both as single cells and as small nests with areas of confluent growth, extending to edges of biopsy
  • Prominent atypia of melanocytes and invasion may be evident only at excision
  • Preservation of retiform epidermis
  • Similar to other histologic subtypes with a lentiginous junctional proliferation (lentigo maligna, acral lentiginous and mucosal lentiginous)
  • Variable dermal fibrosis
  • No solar elastosis
Microscopic (histologic) images

Images hosted on other servers:

Various images

Melanocytic
proliferation and
pagetoid spread
(MART1 and MITF)

Virtual confluent proliferation of melanocytes

Corresponding to Clark level II invasive melanoma

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