Have to weigh in here .....
Yes, Marianna is correct, up to a point, that doctors will often recommend the approach with which they are most comfortable. However, the specific location of one's AN is a huge factor in the recommended approach. If the tumor is still completely within the IAC and closer to the cochlea, with or without pre-op hearing loss, the ability to save the hearing during surgery of any type is greatly reduced. If, on the other hand, the tumor has extended towards the brain stem and farther away from the cochlea, mid-fossa or retrosigmoid approaches have a greater chance of hearing preservation. The size of the tumor is, of course, also involved in all of the recommendations.
I know for a fact that the team of Friedman/Schwartz at HEI do all three approaches on a regular basis. So, when they recommended translab for me I was confident in their recommendation ..... but I did ask why they recommended it.
Everyone should question any doctor's recommendation to be satisfied that the reasons given make sense. As Jan said, sometimes it boils down to your own personal preference. No doctor can guarantee hearing preservation pre-surgery, just give it their best shot. MRIs are good, but only so much can be seen on them.
Clarice