Hi Lisa,
I am going to guess that your doc wants to try modified translab because retorsigmoid is not an option. I know my doc said that even though I had good hearing (80% speech discrimination at the time of my diagnosis), because of the lateral position of my AN, retrosigmoid was not an option for me. He further stated that because of the lateral position of my tumor, if he tried the retrosigmoid approach he might have to expose the entire inner earl, thereby destroying my hearing. The options he gave me were translabrinthine and middle fossa. We had planned on middle fossa, but I had two sudden hearing drops before my surgery and was down to 24% speech discrimination. Subsequently, I had the translabrinthiine approac and am now SSD.. He didn't mention the modified translabrinthine approach and it would not have been practical for me. but I did read about it after my surgery. Based on what I read, the possibility of hearing preservation with this approach, while possible, is quite low. I wish I had saved that article, but unfortunately didn't; I will take a leap here and guess you are not willing to gamble with your facial nerve (and who can blame you?) and are therefore not interested in middle fossa, which could also save your hearing.
Best wishes,
Wendy