Dural Metastasis of Ewing’s Sarcoma imaging and no enhancement (Fig. 1A, B). The ipsilateral internal auditory canal and petrous bone were free of tumor on both CT and MRI (Fig. 1A C). Catheter angiog- raphy showed no blood supply from the meningeal arteries. Surgical resection was performed via a suboccipi- tal approach with partial removal of the ipsilateral mastoid. No petrous bone or adjacent brain parenchyma involve- ment was found. The surgeon observed focal hemorrhage within the mass. Complete resection of the mass was done and this was followed by radiation treatment. The pathologic diagnosis was a metastatic Ewing’s sarcoma with a MIC-2 antigen expression (Fig. 1D). The curvilinear area of high attenuation on CT was determined to be fibrosis on the pathologic examination. The patient again presented with headache in January 2006. MRI revealed a new enhancing lesion abutting the anterior falx cerebri, Korean J Radiol 9(1), February 2008 77 A C B Fig. 1. The T2-weighted (A) and postcontrast T1-weighted images (B) show a mass in the right cerebellopontine angle cistern with extension into the ipsilateral Meckel’s cave. The mass shows a slightly heterogeneous lobulated contour with similar or slightly higher signal intensity than the cortex on the T2-weighted images, with heterogeneous enhancement. Edema is noted in the pons and cerebellum adjacent to the mass. Noncontrast CT shows spots of subtle high-attenuation within the mass (arrows), suggesting the possibility of calcification or hemorrhage. Also seen is a high- attenuation curvilinear area between the mass and the cerebellum (curved arrow), which was determined to be fibrosis on the pathologic examination (C). The ipsilateral internal auditory canal and petrous bone are free of tumor on both the CT and MRI (A-C).