White Sponge Nevus

White sponge nevus (WSN) is a rare autosomal dominant disorder of the non-cornifying squamous epithelia. The clinical hallmarks are white, soft, spongy, thickened plaques on both sides of the oral mucosa and tongue. The mucous membranes of the nose, esophagus, genitalia and rectum may also be involved. Light microscopic examination usually reveals epithelial thickening, parakeratosis, extensive vacuolization of the suprabasal keratinocytes and compact aggregates of keratin intermediate filaments in the upper spinous layers. The disorder usually manifests with whitish mucosal plaques during infancy or early childhood and may be difficult to differentiate from mucosal yeast infections.

Tests Available

Forms and Documents

Test Details

  • 1. Confirmation of a clinical diagnosis
  • 2. Identification of other affected family members


6 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs

*Reporting times are typical, but could be extended in situations outside GeneDx's reasonable control.


  • 530.83 Esophageal leukoplakia
  • 528.6 Leukoplakia of oral mucosa, including tongue Leukokeratosis of oral mucosa Leukoplakia of: gingiva lips tongue
  • 623.1 Leukoplakia of vagina
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**The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.


  1. Witkop, CJ Jr. & Gorlin, R.J. Arch. Derm. 84: 762-771, 1961
  2. Terrinoni, A et al. J. Invest. Derm. 114: 388-391, 2000
  3. Rugg, EL et al. Nature Genet. 11: 450-452, 1995
  4. Richard, G et al. Nature Genet. 11: 453-455, 1995