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Normal Cranial Nerves in the Cavernous Sinuses: Contrast-Enhanced Three-Dimensional Constructive Interference in the Steady State MR Imaging

Akiko Yagia, Noriko Satoa, Ayako Taketomia, Takahito Nakajimaa, Hideo Moritaa, Yoshinori Koyamaa, Jun Aokia and Keigo Endoa

a Department of Diagnostic Radiology and Nuclear Medicine, Gunma University School of Medicine, Gunma, Japan



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  		FIG 1. Contrast-enhanced CISS MR images (TR/TE = 11.8/5.9) in a 44-year-old woman whose acoustic schwannoma had been resected without recurrence.

A, Coronal view clearly shows bilateral CNs III (long black arrow), IV (black arrowhead), V1 (long white arrow), V2 (white arrowhead), and VI (short black arrow) are clearly demonstrated in the normal cavernous sinuses. Additional dark spot is shown inferior to left CNs V1 and VI (short white arrow).

B, Oblique sagittal view also depicts the left CNs III (long black arrow) and VI (short black arrow) well. Additional dark region shown in A is also identified as a serpiginous, dark line without continuity (short white arrow). It is considered to be fibrous tissue.



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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.





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X