FIG 1. Patient 1.

A, T1-weighted axial image (400/15/2 [TR/TE/NEX]), obtained through the left internal auditory canal, shows a hyperintense mass in the cerebellopontine angle (thick black arrow) and vestibule (white arrow). The seventh (open arrow) and eighth (small black arrow) cranial nerves can be seen coursing through the cerebellopontine angle component.

B, T2-weighted fast spin-echo axial image (4000/90/4), obtained through the left internal auditory canal, clearly shows the intravestibular location of the mass (arrow). C, Axial CT scan, obtained through the left internal auditory canal, shows the hypoattenuated cerebellopontine angle and vestibular masses. Hounsfield attenuation units are -112 for the vestibular component (1) and -142 for the cerebellopontine angle component (2), consistent with fat attenuation (lipoma).