WSI21-141-Case-42

From MGH Learn Pathology
WSI21-141-Case-42
23 yo M w/ right temporomandibular joint bone lesion, increasing in size
A. FINE NEEDLE ASPIRATION BIOPSY, RIGHT TEMPOROMANDIBULAR JOINT: POSITIVE FOR MALIGNANT CELLS- Ewing sarcoma.

B. CELLBLOCK, RIGHT TEMPORAMANDIBULAR JOINT: Ewing sarcoma. Note: The final diagnosis is amended from nonspecific neoplasm to Ewing sarcoma as a result of molecular testing showing the EWSR1::FLI1 gene fusion. See separate molecular pathology report.

An immunostain for desmin is also negative, which rules out the unlikely possibility of a rhabdomyosarcoma that has been reported to harbor the same fusion.
December 31, 1969 7:00:00 PM





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