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Related Experiment Videos

Spreading pigmented actinic keratosis. An electron microscopic study.

S M Dinehart1, R L Sanchez

  • 1Department of Dermatology, University of Texas Medical Branch, Galveston.

Archives of Dermatology
|May 1, 1988
PubMed
Summary

Spreading pigmented actinic keratosis, a rare premalignant skin tumor, presents diagnostic challenges. Hyperpigmentation in these lesions results from increased melanosome production and spread, not a transfer issue.

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Area of Science:

  • Dermatopathology
  • Oncology
  • Epidermal Tumors

Background:

  • Spreading pigmented actinic keratosis (SPAK) is a rare premalignant epidermal tumor.
  • Clinical differentiation of SPAK from other pigmented lesions can be challenging.
  • Understanding the cause of hyperpigmentation in SPAK is crucial for diagnosis.

Observation:

  • Seven SPAK lesions from five patients were analyzed.
  • Light microscopy was used to examine all lesions.
  • Electron microscopy was employed for detailed ultrastructural analysis of three lesions.

Findings:

  • Hyperpigmentation in SPAK is characterized by enhanced melanosome formation.
  • Increased melanosome distribution within keratinocytes contributes to hyperpigmentation.

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  • The findings exclude a melanocyte-keratinocyte melanosome transfer block as the cause.

    • Implications:

    • Clarifies the pathophysiology of hyperpigmentation in SPAK.
    • Aids in the clinical and histological differentiation of SPAK.
    • Provides insights into pigmented epidermal tumor development.