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Epithelial sheath neuroma: a new entity.

L Requena1, E Grosshans, H Kutzner

  • 1Department of Dermatology, Fundación Jiménez Díaz, Universidad Autónoma, Madrid, Spain.

The American Journal of Surgical Pathology
|February 19, 2000
PubMed
Summary

Researchers identified a novel skin lesion, the epithelial sheath neuroma, featuring enlarged nerve fibers within squamous epithelial sheaths. This benign neoplasm presents unique histopathological and immunohistochemical characteristics.

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Area of Science:

  • Dermatopathology
  • Surgical Pathology
  • Oncology

Background:

  • Cutaneous lesions require precise histopathological classification for accurate diagnosis and management.
  • Understanding the cellular origins and differentiation of skin neoplasms is crucial for distinguishing benign from malignant conditions.

Observation:

  • Four cases of a peculiar cutaneous lesion were observed, involving the superficial dermis.
  • Histopathology revealed enlarged nerve fibers ensheathed by uniform squamous epithelium, showing signs of cornification (dyskeratosis or orthokeratosis).

Findings:

  • Immunohistochemistry confirmed the dual epithelial and neural nature of the lesion.
  • Nerve fibers expressed S-100 protein, neurofilaments, CD57, and nerve growth factor receptor.
  • Squamous epithelial sheaths showed cytokeratin immunoreactivity.

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Implications:

  • The authors propose "epithelial sheath neuroma" as a distinct, previously undescribed benign neoplasm.
  • This finding expands the spectrum of cutaneous nerve sheath tumors.
  • Recognition of this entity aids in accurate dermatopathological diagnosis and patient management.