Progressive one-sided tinnitus with a delayed cervical response
A 58-year-old reports slowly progressive tinnitus and mild imbalance on one side, with a subtle asymmetric high-frequency hearing loss. The affected-ear cVEMP is reduced in amplitude and its P1 peak occurs distinctly later than the opposite side.
Affected earContralateral ear
Affected-ear cVEMP is reduced in amplitude and prolonged in latency relative to the normal contralateral trace.
Reduced amplitude together with prolonged latency on one side should prompt consideration of which lesion?