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Uncommon pattern in soft tissues epithelioid sarcoma.

Carmen Ardeleanu1, Maria Comănescu, Violeta Comănescu

  • 1Immunohistochemistry Department, "Victor Babeş" National Institute of Pathology, Bucharest. carmena@vbabes.ro

Romanian Journal of Morphology and Embryology = Revue Roumaine De Morphologie Et Embryologie
|January 31, 2006
PubMed
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Epithelioid sarcoma (ES) is a rare tumor that can mimic other conditions. This study highlights unusual histological and immunophenotypic features of ES, emphasizing diagnostic variability.

Area of Science:

  • Oncology
  • Pathology
  • Immunohistochemistry

Background:

  • Epithelioid sarcoma (ES) is a rare soft tissue tumor known for its diagnostic versatility, often mimicking benign lesions or other malignancies.
  • Its histological appearance can suggest epithelial origin, complicating diagnosis.
  • Atypical biological behavior includes propensity for lymph node metastasis, large tumor size, and unusual locations.

Observation:

  • This study retrospectively analyzed three cases of epithelioid sarcoma with unusual clinico-morphological and histopathological patterns.
  • Key features included unusually large tumor dimensions and absence of necrosis.
  • Immunohistochemical (IHC) analysis utilized a panel of antibodies including vimentin, EMA, cytokeratins, S-100 protein, CD68, p53, and vascular markers.

Findings:

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  • The tumors exhibited large dimensions and a vaguely alveolar pattern without necrosis.
  • IHC revealed strong S-100 protein positivity, variable cytokeratin (KL1, CK19) expression, scarce EMA positivity, zonal CD34 positivity, and diffuse vimentin positivity.
  • These findings underscore the heterogeneity of ES immunophenotypes.

Implications:

  • The immunophenotype of epithelioid sarcoma demonstrates significant variability.
  • Accurate diagnosis requires correlating clinico-morphological findings with comprehensive IHC analysis.
  • Recognizing these diverse presentations is crucial for appropriate patient management and treatment strategies.