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Figure 1: Axial CT scans (a) show bilateral smoothly marginated, lobulary cystic lesions of petrous apex. Axial T1 (b) and T2 (c) weighted images demonstrate bilateral cystic lesions that have similar signal intensity with CSF (hypointense on T1, hyperintense on T2). Also, the communications with Meckel's cave are identified (arrows)

Figure 1: Axial CT scans (a) show bilateral smoothly marginated, lobulary cystic lesions of petrous apex. Axial T1 (b) and T2 (c) weighted images demonstrate bilateral cystic lesions that have similar signal intensity with CSF (hypointense on T1, hyperintense on T2). Also, the communications with Meckel's cave are identified (arrows)