There are lot useless docs and surgeons waiting to perform unnecessary expensive procedures much like building contractors. Oh that pipe is leaking let's just replace this entire load bearing wall etc cause we have this new cool machine that can. Second opinions are over rated cause the majority don't care. There is an endless demand for their trade.
My dad lost his hearing at 35 after they performed surgery to remove a tumor they detected. They detected the same Tumor in my brother when he was in his 20s and wanted to operate with no guarantee of hearing preservation. He declined. He is going to turn 40 soon and would have most likely been deaf for 20 years if he had gone through with it. Minor issues with his balance but other than that he is fine even though tumor gets tracked every couple years and is still growing.