Table 1.
Classification of ILS
| Class | Abbreviation | Classification | Area involved |
|---|---|---|---|
| I a | IVE | Intravestibular | vestibule (+/- semicircular canals) |
| I b | ICO | Intracochlear | cochlea |
| I c | IVC | Intravestibulocochlear | vestibule + cochlea |
| II a | TMA | Transmacular | IAC + vestibule |
| II b | TMO | Transmodiolar | IAC + cochlea |
| II c | CVC | Canalovestibulocochlear | IAC + vestibule + cochlea |
| III a | TVE | Tympanovestibular | Middle ear + vestibule |
| III b | TCO | Tympanocochlear | Middle ear + cochlea |
| III c | TVC | Tympanovestibulocochlear | Middle ear + vestibule + cochlea |
| IV | TO | Transotic | Middle ear + vestibule/cochlea + IAC |
IAC = internal auditory canal