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Related Experiment Videos

Epidermal nevi and localized cranial defects.

N Ho1, C Roig, P Diadori

  • 1Medical Genetics Branch, NHGRI, National Institutes of Health, Bethesda, Maryland 20892, USA. nicola@nhgri.nih.gov

American Journal of Medical Genetics
|March 30, 1999
PubMed
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This study describes a rare case of a giant congenital hairy nevus on a baby's scalp, associated with skull bone defects. This unique presentation may stem from developmental anomalies or simultaneous skin and bone dysplasia.

Area of Science:

  • Dermatology
  • Pediatric Neurology
  • Medical Genetics

Background:

  • Congenital pigmented hairy nevi are rare skin malformations.
  • Epidermal nevi are benign epithelial tumors.
  • Cranial defects can occur in isolation or as part of syndromes.

Observation:

  • A girl presented with a giant congenital pigmented hairy nevus of the scalp.
  • She also had epidermal nevi on her right temple and localized cranial defects.
  • No familial history of epidermal nevi or seizures was reported.

Findings:

  • This is the first reported case of a giant pigmented hairy nevus of the scalp with underlying cranial bone absence.
  • The cranial defects are hypothesized to be undergrowth anomalies possibly due to paracrine factors from the nevus or simultaneous bone/skin dysplasia.

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  • The patient's presentation suggests a sporadic case, potentially a somatic mutation.

    • Implications:

    • This case expands the understanding of congenital nevus spectrum disorders.
    • It highlights the potential association between large congenital nevi and underlying skeletal anomalies.
    • Further research is needed to elucidate the exact pathogenesis and genetic underpinnings of such rare conditions.