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Related Experiment Videos

Cellular nodules in congenital pattern nevi.

Xiaowei Xu1, Kirsten S W Bellucci, Rosalie Elenitsas

  • 1Departments of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, USA. xug@mail.med.upenn.edu

Journal of Cutaneous Pathology
|December 24, 2003
PubMed
Summary

Cellular dermal nodules in melanocytic nevi are challenging to diagnose and can mimic melanoma. This study confirms their benign clinical course with long-term follow-up, aiding accurate diagnosis.

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Area of Science:

  • Dermatopathology
  • Oncology
  • Melanoma Research

Background:

  • Cellular dermal nodules in melanocytic nevi present diagnostic challenges, often mimicking melanoma.
  • Distinguishing these benign nodules from malignant melanoma is crucial due to melanoma's poor prognosis.
  • Long-term follow-up data confirming the benign nature of cellular nodules is lacking.

Purpose of the Study:

  • To investigate the clinical behavior and histological characteristics of cellular dermal nodules in melanocytic nevi.
  • To provide evidence supporting the benign nature of these lesions through clinical follow-up.
  • To identify key features differentiating cellular nodules from melanoma.

Main Methods:

  • A retrospective clinical pathological study of 26 cases with cellular dermal nodules in melanocytic nevi.

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  • Clinical follow-up was obtained via chart review and questionnaires.
  • Histological features were analyzed to identify differentiating characteristics.

    • Main Results:

    • Clinical follow-up was achieved for 16 out of 26 patients (61.5%), ranging from 12 to 132 months (average 62.3 months).
    • The cellular nodules in congenital pattern nevi demonstrated an invariably benign clinical course.
    • Key histological features aiding differentiation from melanoma were identified.

    Conclusions:

    • Cellular dermal nodules in melanocytic nevi exhibit a benign clinical course.
    • Histological indicators for differentiation include lack of atypia, necrosis, and pagetoid spread, alongside evidence of maturation and rare mitoses.
    • Individual case assessment is essential due to subtle differences between benign nodules and melanoma.