Skin melanocytic tumor
Nevi
Junctional nevus


Topic Completed: 1 February 2017

Revised: 4 April 2019

Copyright: 2003-2019, PathologyOutlines.com, Inc.

PubMed Search: Junctional nevus [title]

Christopher S. Hale, M.D.
Page views in 2018: 7,301
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Cite this page: Hale C Junctional nevus. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/skintumormelanocyticJunctnevus.html. Accessed September 23rd, 2019.
Definition / general
  • Melanocytic proliferation restricted to basal epidermis (junctional area)
  • Earliest stage of intraepidermal melanocytic proliferation
Terminology
  • Lentigo simplex:
    • Also called lentigo, lentigines
    • Often in acral sites
    • Precursor lesion to nevi, with proliferation of melanocytes (but no nests) in epidermal basal layer along rete ridges (DermNet NZ)
  • Multiple lentigines:
    • Associated with Peutz-Jeghers syndrome, centrofacial lentiginosis, Moynahan’s syndrome, LEOPARD syndrome, Carney’s syndrome and xeroderma pigmentosum
Epidemiology
  • Traditionally considered more common in children (possible sampling bias), may actually occur in all ages (J Am Acad Dermatol 2007;56:825)
  • Melanomas may arise from junctional nevi
Sites
Clinical features
  • Small, flat or slightly elevated; non-hairy, deeply pigmented
Case reports
Treatment
Dermoscopy
  • Regular pigmented network of brown and uniform color, more prominent in center with gradual fading to borders (reticular pattern)
  • May have black or brown globules and dots regularly distributed inside lesion (usually in central region)
Microscopic (histologic) description
  • Rounded nests of melanocytes / nevus cells on epidermal side of dermoepidermal junction, originating from tips of rete ridges
  • Variable lentiginous melanocytic hyperplasia
Microscopic (histologic) images

Contributed by Dr. Mark R. Wick
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Breast skin


Images hosted on other servers:
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Junctional nests

Differential diagnosis
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