Ewing sarcoma - fibula

Discussion:

Ewing sarcoma has a predilection for the diaphysis of the long bones, as well as the ribs and flat bones such as the scapula and pelvis. MRI may effectively reveal extension through the epiphyseal plate. T1-weighted images show intermediate to low signal intensity, which becomes bright on T2 weighting. Hypocellular regions and areas of necrosis are of lesser intensity. Imaging after contrast reveals signal enhancement of the tumor on T1-weighted sequences. Enhancement occurs only in the cellular areas, allowing differentiation of the tumor from the peritumoral edema. Skip lesions in Ewing's sarcoma of the bone seem to be rare. The skip lesion are located in most cases in the same bone as the primary tumor.

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