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FIG 2. Normal cavernous sinuses in a 46-year-old woman after surgical resection of left acoustic schwannoma without recurrence.
A, Enhanced coronal CISS MR image (TR/TE = 11.8/5.9) shows bilateral CNs III (long black arrows), IV (black arrowheads), V1 (long white arrows), left V2 (white arrowhead), and bilateral VI (short black arrows). Only the right CN V2 is not identified. Additional faint, low-intensity spots are inferior to CNs VI (short white arrows), which are not considered to be nerves because they are in an anatomically different location and because they do not have continuity on reconstructed CISS MR imaging.
B, Enhanced coronal T1-weighted MR image (TR/TE = 450/15) shows only bilateral CNs III (long black arrow), left CN V2 (white arrowhead), and bilateral CNs VI (short black arrow).Other small contrast defects are just inferior to the bilateral CN VI (short white arrows), as shown in A.
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