Combined transmodiolar/transmacular schwannoma.
A, Axial enhanced T1-weighted MR image (39/14/2) at the level of the IAC shows an enhancing mass in the fundus of the IAC (open arrow) with extension into the cochlea (large white arrow) and vestibule (small white arrow).
B, Axial high-resolution FSE T2-weighted MR image (4000/102/6) at the level of the IAC shows the hypointense mass in the cochlea (large white arrow) and vestibule (curved white arrow). A small nodule is also seen within the fundus of the IAC (small white arrow). The normal modiolus is well seen on the right (open right arrow). Used by permission (37).