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Related Experiment Videos

Benign epithelioid schwannoma

L G Kindblom1, J M Meis-Kindblom, G Havel

  • 1Department of Pathology, Gothenburg Musculoskeletal Tumor Center, Sahlgrenska University Hospital, University of Gothenburg, Sweden.

The American Journal of Surgical Pathology
|June 18, 1998
PubMed
Summary

Benign epithelioid schwannoma is a newly defined tumor variant. This study describes its key features, aiding in distinguishing it from malignant tumors.

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Area of Science:

  • Pathology
  • Oncology
  • Dermatology

Background:

  • Schwannomas (neurilemomas) exhibit diverse morphologies, complicating diagnosis.
  • Malignant schwannoma's epithelioid variant is recognized, but a benign counterpart was undefined.

Purpose of the Study:

  • To define and describe the clinicopathologic features of benign epithelioid schwannoma.
  • To differentiate benign epithelioid schwannoma from malignant mimics.

Main Methods:

  • Histopathological examination of five cases.
  • Immunohistochemical and ultrastructural analysis for Schwann cell differentiation.
  • Clinical follow-up to assess behavior.

Main Results:

  • Five cases of benign epithelioid schwannoma identified in subcutis and urinary bladder.

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  • Tumors showed circumscription, cellularity, epithelioid cells in cords/nests.
  • Low proliferative index (Ki67 ≤1% in 4/5 cases) and benign clinical course observed.

    • Conclusions:

    • Benign epithelioid schwannoma is a distinct entity with characteristic features.
    • Recognition is crucial to prevent misdiagnosis as various malignant tumors.
    • Low Ki67 and benign course support its non-malignant nature.