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Cutaneous Ewing Sarcoma Presenting as a Second Primary Malignancy in a Child.

Jessica Daley1, Nathan Williams2, Claudia M Salgado3

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Cutaneous Ewing sarcoma, a rare cancer variant, presents unique diagnostic challenges. Accurate diagnosis requires integrating histology and genetic sequencing for this EWS-ETS driven malignancy.

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Area of Science:

  • Oncology
  • Pathology
  • Genetics

Background:

  • Ewing sarcoma is an EWS-ETS family member-driven malignancy typically originating in bone.
  • Cutaneous Ewing sarcoma is a rare variant with distinct immunohistochemical features.
  • Diagnostic interpretation of EWSR1 fluorescence in situ hybridization can be difficult in cutaneous cases.

Purpose of the Study:

  • To highlight the diagnostic complexities of cutaneous Ewing sarcoma.
  • To emphasize the importance of an integrated diagnostic approach.
  • To report a case of cutaneous Ewing sarcoma as a second primary cancer in a pediatric patient.

Main Methods:

  • Histologic examination of cutaneous nodules.
  • Immunohistochemical staining.
  • EWSR1 fluorescence in situ hybridization (FISH) testing.
  • Next-generation sequencing (NGS) for EWS-ETS fusions.

Main Results:

  • The patient presented with a cutaneous nodule.
  • Histopathology and molecular testing confirmed cutaneous Ewing sarcoma.
  • The tumor harbored an EWS-ETS fusion but showed distinct immunohistochemical staining compared to classic Ewing tumors.
  • This represented a second primary cancer in a pediatric patient with a history of neuroblastoma.

Conclusions:

  • An integrated approach combining histology, immunohistochemistry, and molecular sequencing is crucial for diagnosing cutaneous Ewing sarcoma.
  • Cutaneous Ewing sarcoma requires careful evaluation due to its distinct features and potential challenges in FISH interpretation.
  • This case underscores the importance of considering secondary malignancies in pediatric patients with a history of cancer.