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Measurements of endolymphatic structures, by group
| Structure | Meniere’s disease group | Endolymphatic hydrops group | Nondiseased group | |
|---|---|---|---|---|
| Mean volume (mm3) | Vestibular aqueduct | 2.85 | 7.93 | 7.93 |
| Endolymphatic sinus | 0.29 | 0.26 | 0.34 | |
| Endolymphatic duct | 0.34 | 0.40 | 0.48 | |
| Intratemporal portion of endolymphatic sac | 1.95 | 6.21 | 5.97 | |
| Mean width of the opening (mm) | Internal aperture | 0.35 | 0.42 | 0.38 |
| External aperture | 3.95 | 8.18 | 7.28 | |
| Bast’s valve | 0.21 | - | - |
