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This report details the CT and MR imaging findings of a primary orbital Ewing's sarcoma case involving the middle cranial fossa in a 13-year old boy. CT showed an ill-circumscribed homogeneous soft-tissue density mass with needle-like bone reaction. On MRI, the mass showed homogeneous iso-intensity on T1WI, heterogeneous hyperintensity on T2WI, and marked homogeneous enhancement. Meanwhile, the mass was hyper-intense on DWI, and ADC value was 575×10-6 mm2/s. The mass showed as high rCBV and rCBF, prolonged MTT based on DCSPWI, and wash-out pattern of TIC derived from the DCE-MRI. Our case suggests that functional MRI modalities, including DWI, DSC-PWI or DCE-MR, could provide additional information for differential diagnoses. Both CT and MRI should be performed and comprehensively analyzed for limiting differential diagnoses, determining lesion extension and facilitating operative approach. [ABSTRACT FROM AUTHOR]

Alveolar soft part sarcoma (ASPS) of the orbit is exceedingly rare and little is known regarding its radiologic features. Here, we reviewed the CT and MRI findings of one case of ASPS of the orbit with emphasis on its salient imaging features. [ABSTRACT FROM AUTHOR]