The imaging studies show an aggressive lesion. Complete work up showed multiple nodules in the lungs.   Aggressive lesions include malignant bone tumors and some benign lesions.   The differential should include osteosarcoma, Ewing's sarcoma, primary lymphoma, osteoblastoma, infection, and eosinophilic granuloma.   Click here if you want to review the criteria that are used to determine if a lesion is aggressive or not. 

The low and high power views of the biopsy material are shown.  Click on them for a better look.

Given the biopsy shows sheets of markedly similar cells of a certain type, what is the most likely (and also the correct) diagnosis?

Click here for the answer.

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