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Incidence of facial nerve canal fluid/meningocelea
None (No.)Unilateral (No.)Bilateral (No.)
Labyrinthine segment fluid168 (82.4%)22 (10.8%)14 (6.9%)
Geniculate ganglion fossa fluid164 (80.4%)21 (10.3%)19 (9.3%)
Geniculate ganglion fossa meningocele199 (97.5%)5 (2.5%)0 (0.0%)
  • ↵a Incidence of fluid signal in the facial nerve canal on 3D fast spin-echo T2 sequences in 204 patients. Meningoceles were defined on the basis of size criteria: ≥1.0-mm diameter of the labyrinthine segment of the facial nerve canal, and ≥2.0-mm diameter of the geniculate ganglion fossa. No meningoceles were observed within the labyrinthine segment.