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Granular cell dermatofibroma

B G Zelger1, H Steiner, H Kutzner

  • 1Department of Pathology, Univeristy of Innsbruck, Austria.

Histopathology
|November 14, 1997
PubMed
Summary
This summary is machine-generated.

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This study describes granular cell dermatofibromas, a rare fibrohistiocytic tumor. These distinct lesions require differentiation from other granular cell tumors.

Area of Science:

  • Dermatopathology
  • Oncology
  • Histopathology

Background:

  • Granular cell tumors are a diverse group of neoplasms.
  • Dermatofibromas represent a common fibrohistiocytic proliferation.
  • Distinguishing between these entities is crucial for accurate diagnosis.

Purpose of the Study:

  • To characterize a series of five granular cell dermatofibromas.
  • To highlight their unique clinicopathological features.
  • To differentiate them from other granular cell tumors.

Main Methods:

  • Retrospective analysis of five cases diagnosed as granular cell dermatofibromas.
  • Histopathological examination including immunohistochemistry (NK1C3, KiM1p, KP1, S100, factor XIIIa, smooth muscle actin, E9).
  • Electron microscopy was performed in one case.

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Main Results:

  • Five granular cell dermatofibromas were identified among 136 granular cell tumors.
  • Lesions occurred on the shoulder/back of middle-aged adults.
  • Histology showed PAS-positive granular cells with fibrohistiocytic features (acanthosis, storiform pattern, sclerotic collagen).
  • Immunohistochemistry revealed reactivity for CD57, CD68, factor XIIIa, smooth muscle actin, and E9, but negativity for S100 protein.
  • Electron microscopy showed prominent phago-lysosomes and glycogen granules.

Conclusions:

  • Granular cell dermatofibroma is a distinct clinicopathological variant of fibrohistiocytic proliferation.
  • It exhibits unique immunohistochemical and ultrastructural features.
  • Distinguishing it from other granular cell tumors is essential.