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. 2011;1(3):237–245.

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