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Pigmented spindle cell naevus.

L Requena1, E Sanchez Yus

  • 1Department of Dermatology, University Hospital of San Carlos, Madrid, Spain.

The British Journal of Dermatology
|December 1, 1990
PubMed
Summary
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Pigmented spindle cell nevus (PSCN) presents as a heavily pigmented papule, often on young patients' legs. This distinctive benign nevus is frequently misdiagnosed as atypical Spitz nevi or melanoma.

Area of Science:

  • Dermatopathology
  • Melanocytic Neoplasms

Background:

  • Pigmented spindle cell nevus (PSCN) is a type of melanocytic nevus.
  • These nevi are often found on the legs of young individuals and present as heavily pigmented papules.

Purpose of the Study:

  • To describe the clinical and histological features of 22 cases of PSCN.
  • To differentiate PSCN from potentially misdiagnosed conditions like atypical Spitz nevi and malignant melanoma.

Main Methods:

  • Histological examination of 22 cases of PSCN.
  • Analysis of clinical presentation, including patient demographics and lesion location.

Main Results:

  • PSCN characterized by symmetrical proliferation of spindle-shaped pigmented melanocytes in large junctional nests.

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  • Pagetoid spread of single cells in the overlying epidermis was a frequent finding.
  • Lesions were typically heavily pigmented papules predominantly on the legs of young patients.

    • Conclusions:

    • PSCN is a distinct, benign acquired melanocytic nevus.
    • Accurate histological diagnosis is crucial to avoid misclassification as atypical Spitz nevi or melanoma.