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Two axial images from the same case of a facial nerve schwannoma involving the right mastoid segment of the facial nerve canal. The axial T1-weighted postcontrast MR image (left) shows homogeneous enhancement of the mass (between arrows). The bone algorithm CT (right) at the same level shows focal enlargement of the descending segment with extension toward the external auditory canal (between arrows). From Wiggins and Harnsberger (2001). Used with permission.
