Surgical Pathology Criteria

Peripheral Primitive Neuroectodermal Tumor

Supplemental Studies

Immunohistology

CD99 >90% membrane
Keratin 5-15% scattered cells
NSE 40-90%
Synaptophysin 40-50%
Chromogranin 0-25%
CD57 15-40%

Histochemical stains

Genetic study

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