Table 1.
Details of Cochlear Pathology in IAC Schwannomas
| Case | Age | Side | Nerve of Origin | IHC | OHC | Stria | Neurons | Hydrops | Precipitate
|
|
|---|---|---|---|---|---|---|---|---|---|---|
| EL | PL | |||||||||
| B1 | M / 81 | Tumor | SV | + | ++ | ++ | + | − | + | + |
| contralateral | − | − | + | − | − | − | − | |||
|
| ||||||||||
| B2 | M / 84 | Tumor | SV | + | + | ++ | + | − | − | − |
| contralateral | − | − | + | − | − | |||||
|
| ||||||||||
| B3 | M / 74 | Tumor | IV | + | ++ | + | +++ | − | − | + |
| contralateral | not available | |||||||||
|
| ||||||||||
| B4 | M / 75 | Tumor | VN | ++ | +++ | ++ | +++ | + | + | + |
| contralateral | + | + | ++ | − | − | − | ||||
|
| ||||||||||
| B5 | F / 100 | Tumor | VN | ++ | ++ | ++ | +++ | − | − | − |
| contralateral | − | − | + | ++ | − | − | − | |||
|
| ||||||||||
| B6 | F / 74 | Tumor | IV | + | + | − | − | − | − | − |
| contralateral | + | + | − | − | − | − | − | |||
|
| ||||||||||
| B7 | M / 79 | Tumor | SV | − | − | − | + | − | − | − |
| contralateral | not available | |||||||||
|
| ||||||||||
| B8 | M / 80 | Tumor | IV | − | − | + | − | − | − | − |
| contralateral | − | − | − | − | − | − | − | |||
|
| ||||||||||
| B9 | F / 75 | Tumor | IV | − | − | + | + | − | − | − |
| contralateral | − | − | + | + | − | − | − | |||
|
| ||||||||||
| B10 | M / 80 | Tumor | SV | − | + | ++ | + | − | − | + |
| contralateral | not available | |||||||||
|
| ||||||||||
| B11 | F / 81 | Tumor | SV | +++ | +++ | + | + | + | − | − |
| contralateral | not available | |||||||||
|
| ||||||||||
| B12 | F / 74 | Tumor | VN | +++ | +++ | − | + | + | + | + |
| contralateral | +++ | +++ | − | − | + | − | − | |||
|
| ||||||||||
| Z1 | M / 25 | Tumor | VN | + | ++ | − | ++ | + | + | + |
| contralateral | + | + | + | + | − | + | + | |||
|
| ||||||||||
| Z2 | M / 87 | Tumor | VN | +++ | ++ | ++ | ++ | − | − | − |
| contralateral | not available | |||||||||
|
| ||||||||||
| Z3 | F / 57 | Tumor | SV | − | + | − | + | − | − | − |
| contralateral | not available | |||||||||
|
| ||||||||||
| Z4 | F / 53 | Tumor | VN | + | + | − | ++ | − | − | + |
| contralateral | not available | |||||||||
|
| ||||||||||
| Z5 | F / 72 | Tumor | VN | + | ++ | ++ | + | − | + | + |
| contralateral | not available | |||||||||
|
| ||||||||||
| Z6 | F / 39 | Tumor | VN | ++ | ++ | − | ++ | − | + | + |
| contralateral | − | + | − | + | − | − | + | |||
|
| ||||||||||
| M1 | M / 72 | Tumor | VN | +++ | +++ | − | + | − | − | − |
| contralateral | not available | |||||||||
|
| ||||||||||
| M2 | M / 77 | Tumor | SV | + | ++ | + | + | − | − | − |
| contralateral | + | ++ | + | + | − | − | − | |||
|
| ||||||||||
| M3 | M / 86 | Tumor | Co | +++ | +++ | +++ | +++ | + | + | + |
| contralateral | + | + | − | − | − | − | + | |||
|
| ||||||||||
| M4 | M / 68 | Tumor | SV | +++ | +++ | + | + | − | − | − |
| contralateral | +++ | +++ | + | + | + | − | − | |||
|
| ||||||||||
| M5 | M / 81 | Tumor | SV | ++ | ++ | − | +++ | − | + | + |
| contralateral | not available | |||||||||
|
| ||||||||||
| M6 | M / 67 | Tumor | SV | ++ | +++ | + | ++ | − | − | − |
| contralateral | ++ | +++ | + | + | − | − | − | |||
|
| ||||||||||
| M7 | M / 76 | Tumor | VN | + | +++ | − | ++ | + | + | + |
| contralateral | + | + | + | ++ | − | − | − | |||
|
| ||||||||||
| M8 | M / 52 | tumor | Co | − | + | + | + | − | − | − |
| contralateral | − | + | + | + | − | − | − | |||
|
| ||||||||||
| M9 | M / 44 | tumor | VN | + | + | + | − | − | + | + |
| contralateral | − | + | + | − | − | − | − | |||
|
| ||||||||||
| H1 | F / 69 | tumor | IV | +++ | +++ | ++ | + | − | − | + |
| contralateral | − | + | − | − | − | − | − | |||
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| ||||||||||
| H2 | F / 79 | tumor | SV | − | + | ++ | + | − | − | − |
| contralateral | − | + | ++ | + | + | − | − | |||
|
| ||||||||||
| H3 | F / 76 | tumor | IV | + | ++ | + | + | − | − | − |
| contralateral | − | − | + | − | − | − | − | |||
|
| ||||||||||
| H4 | F / 71 | tumor | IV | − | − | + | − | − | − | − |
| contralateral | − | − | + | − | − | − | − | |||
|
| ||||||||||
| H5 | F / 94 | tumor | IV | + | +++ | ++ | − | + | − | − |
| contralateral | + | ++ | + | − | − | − | − | |||
IHC=inner hair cells, OHC=outer hair cells, Stria=strial atrophy, Neurons=cochlear neurons, EL=endolymph, PL=perilymph, IV=inferior division of vestibular nerve, SV=superior division of vestibular nerve, VN=vestibular nerve, Co=cochlear nerve.
Rating scale for IHC, OHC, Stria, and Neurons: +++ = 67 – 100% loss, ++ = 34 – 66% loss, + = 1 – 33% loss, − = 0% loss
For hydrops and precipitate: + indicates presence, − indicates absence