|Poll|October 12, 2011

A 7-Year-Old Girl With Hereditary Multiple Exostosis Presents With a Painful Mass on Her Right Femur

A 7-year-old girl with hereditary multiple exostosis presents with a growing painful mass on her right femur. The following is an H&E stained slide of the mass.

Click here for the comparative pathology.

The diagnosis is most likely:

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