Ewing sarcoma - humerus

Discussion:

This is an aggressive bone lesion and in a young teen, a mid-diaphyseal lesion is likely to be Ewing sarcoma (which biopsy confirmed). The extent of disease is identified by the low signal on T1, not the high signal on T2 (since this includes edema). It is important to report the size of the lesion, distance from physes, involvement of metaphysis, physis or epiphysis and comment on skip lesions. The whole bone must be imaged.

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