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Reticulin immunostaining revisited.

Kara Melissa T Torres1, Viktoryia Kazlouskaya2, Kruti Parikh1

  • 1Ackerman Academy of Dermatopathology, Section of Dermatopathology, New York, USA.

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|March 9, 2016
PubMed
Summary

Reticulin staining shows distinct dermal patterns differentiating melanomas from benign nevi. However, inconsistent basement membrane pattern evaluation limits its diagnostic utility for melanocytic lesions.

Keywords:
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Area of Science:

  • Dermatopathology
  • Oncology
  • Histopathology

Background:

  • Reticulin staining is a potential inexpensive diagnostic aid for melanoma versus benign nevi.
  • This study investigated reticulin immunostaining patterns in melanomas, benign nevi, and blue nevi.
  • Observer concordance in pattern evaluation was also assessed.

Purpose of the Study:

  • To evaluate reticulin immunostaining patterns in melanomas, benign intradermal nevi, and blue nevi.
  • To assess inter-observer agreement in the evaluation of these patterns.
  • To determine the utility of reticulin staining in the differential diagnosis of melanocytic lesions.

Main Methods:

  • Retrospective analysis of 56 melanomas, 54 benign compound nevi, and 27 blue nevi.
  • Evaluation of reticulin staining patterns in the dermis and basement membrane.
  • Statistical analysis using Cohen's kappa coefficient for concordance assessment.

Main Results:

  • Melanomas exhibited variable basement membrane patterns, including flat, thin, and smooth types, unlike benign nevi.
  • Dermal reticulin fibers surrounded groups of cells in melanomas versus individual cells in nevi.
  • Higher agreement was observed for dermal patterns compared to basement membrane patterns.

Conclusions:

  • Dermal reticulin staining patterns may aid in diagnosing melanocytic lesions.
  • Poor concordance in basement membrane pattern evaluation restricts the overall diagnostic usefulness.
  • Further refinement is needed to enhance the reliability of reticulin staining in dermatopathology.