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"Proximal-type" and classic epithelioid sarcomas represent a clinicopathologic continuum: case report
Dinesh Rakheja1, Kathleen S Wilson, John Meehan
1Department of Pathology, Children's Medical Center of Dallas, 1935 Motor Street, Dallas, TX 75235, USA.
Summary
This study suggests proximal-type and classic epithelioid sarcomas are a continuum, not distinct entities. Findings in a 14-year-old boy with hand epithelioid sarcoma support this, showing similar morphology after lung metastasis.
Area of Science:
- Oncology
- Pathology
- Cytogenetics
Background:
- Epithelioid sarcoma is a rare soft tissue sarcoma.
- Distinguishing between proximal-type and classic epithelioid sarcoma can be challenging.
- Understanding the relationship between different morphological subtypes is crucial for accurate diagnosis and treatment.
Observation:
- A 14-year-old boy presented with an epithelioid sarcoma in his right hand exhibiting proximal-type morphology.
- The tumor showed a complex, near-tetraploid karyotype.
- The same tumor later metastasized to the lungs.
Findings:
- Metastatic lesions in the lungs displayed morphology typical of classic epithelioid sarcoma.
- Morphological and cytogenetic analyses suggest a link between proximal-type and classic epithelioid sarcoma.
- The findings indicate a potential continuum between these two previously considered distinct entities.
Implications:
- This case challenges the classification of epithelioid sarcoma subtypes.
- It suggests that proximal-type and classic epithelioid sarcoma may represent variations of the same disease spectrum.
- Further research is warranted to elucidate the pathobiology and confirm this continuum in a larger cohort.