Skin - Melanocytic tumor
Nevi
White sponge nevus

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

Revised: 24 February 2017, last major update March 2013

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PubMed Search: white sponge nevus

Cite this page: White sponge nevus. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/skintumormelanocyticwhitespongenevus.html. Accessed February 25th, 2017.
Definition / General
  • Not a melanocytic entity; benign keratinization defect leading to white plaques on mucosa
  • Primarily affects nonkeratinized stratified squamous epithelium
  • First described by Cannon in 1935 (Arch Dermatol Syphilol 1935;31:365)
Terminology
  • Synonyms: familial white folded mucosal dysplasia, leukoderma exfoliativum mucosae oris, hereditary leukokeratosis
Epidemiology
Sites
  • Buccal, gingival, esophageal, rectal or genital mucosal surfaces
Clinical Features
  • White to gray, diffuse, painless, spongy and folded plaques on buccal mucosa
Case Reports
Treatment
  • No standard treatment; although reports of tetracycline, chlorhexidine
  • Progression usually stops at puberty
  • No malignant transformation
Clinical Images

Images hosted on other servers:

White plaques on buccal mucosa

White plaques on tongue

Micro Description
  • Parakeratosis, acanthosis with formation of large blunt rete ridges and spongiosis
  • Extensive vacuolation of suprabasal keratinocytes
  • Dyskeratotic cells exhibit dense peri and paranuclear eosinophilic condensations, which correspond to tonofilament aggregates
  • Abundant Odland bodies (keratinosome, membrane bound granule in upper stratum spinosum) within keratinocytes but few are present in the intercellular spaces
Micro Images

Images hosted on other servers:

Parakeratosis

Differential Diagnosis