What is the standard diagnostic approach to confirm Ewing sarcoma?

What is the standard diagnostic approach to confirm Ewing sarcoma?

• A. Fine-Needle Aspiration
• B. Open Biopsy
• C. Fine‑Needle Aspiration or Open Biopsy
• D. Imaging Studies Only

Answer: (C)

Confirming Ewing sarcoma requires a tissue diagnosis with molecular confirmation, not imaging alone. Imaging helps stage and plan, but it can’t prove the diagnosis by itself. The tissue is analyzed for characteristic histology and then subjected to immunohistochemistry and molecular testing to detect EWSR1 gene rearrangements, which confirms Ewing sarcoma. To obtain that tissue, a biopsy is performed. A Fine-Needle Aspiration can yield diagnostic material in some cases, but often a larger sample is needed to evaluate architecture and to perform all the necessary ancillary tests. An Open Biopsy provides that more substantial tissue. Therefore, either Fine-Needle Aspiration or Open Biopsy can be used to secure the diagnostic specimen, with the key goal being enough tissue for histology, immunohistochemistry, and molecular testing.

Confirming Ewing sarcoma requires a tissue diagnosis with molecular confirmation, not imaging alone. Imaging helps stage and plan, but it can’t prove the diagnosis by itself. The tissue is analyzed for characteristic histology and then subjected to immunohistochemistry and molecular testing to detect EWSR1 gene rearrangements, which confirms Ewing sarcoma.

To obtain that tissue, a biopsy is performed. A Fine-Needle Aspiration can yield diagnostic material in some cases, but often a larger sample is needed to evaluate architecture and to perform all the necessary ancillary tests. An Open Biopsy provides that more substantial tissue. Therefore, either Fine-Needle Aspiration or Open Biopsy can be used to secure the diagnostic specimen, with the key goal being enough tissue for histology, immunohistochemistry, and molecular testing.