ABSTRACT Ewing sarcoma is an aggressive malignancy that most often presents as an undifferentiated primary bone tumor; less commonly, it arises in extraosseous soft tissues of mesenchymal cell origin. Primary… Click to show full abstract
ABSTRACT Ewing sarcoma is an aggressive malignancy that most often presents as an undifferentiated primary bone tumor; less commonly, it arises in extraosseous soft tissues of mesenchymal cell origin. Primary extraosseous involvement of seminal vesicle is rarely reported. Herein, we describe FDG PET/CT and MRI findings of a 55-year-old man who presented with a pelvic mass, which was confirmed to be primary Ewing sarcoma/primitive neuroectodermal tumor arising from seminal vesicle by histopathologic findings.
               
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