Findings of BERA in vestibular schwannoma:-
In vestibular schwannoma, there is increased latency in wave 1 -5 Waves of BERA: E- wave 1: Distal pa of 8th nerve. E- wave 2: Proximal pa of 8th nerve. C- wave 3: Cochlear nucleus O- wave 4: Superior Olivery complex L- wave 5: Lateral leminiscus - Largest wave - Most stable - Produced at 5.5 ms after the stimulus I- wave 6 & 7: Inferior colliculus
Increased latency in waves I-V
Decreased latency in waves I-V
Increased latency in waves VI-VII
Decreased latency in waves VI-VII
JIPMER 2018