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(a) Gd-enhanced MRI showing a tumor located at the left cerebellopontine angle cistern that was protruding into the left internal auditory canal (IAC) (Case 5). (b) CT with the condition of bone density showing an enlargement of the left IAC and the degree of development of mastoid air cells. (c) ZTE-based MRI revealing the expansion of the left IAC, but no clear depiction of mastoid air cells (white arrow: left IAC).
