Radiologic characterization of endolymphatic sac tumor. A. CT imaging demonstrated an expansile lytic lesion of the mastoid process of the left petrous bone extending to involve both the left medial mastoid as well as the middle ear. B. MR scan showed a 5.2 cm × 4.7 cm × 4.2 cm mass which was irregular, heterogeneous, and lobulated and showed hyperintensity on T1-weighted images. C. The periphery of the lesion appeared markedly hyperintense on the T2-weighted images. D. Axial postcontrast T1-weighted MR scan showed a heterogeneous enhancing mass.
Sun et al. Diagnostic Pathology 2012 7:36 doi:10.1186/1746-1596-7-36