What dose/fractionation would you consider for salvage re-irradiation of a vestibular schwannoma after fractionated stereotactic radiation, >4 years later?

Salvage re-irradiation for vestibular schwannoma (VS) is far from "routine" for several reasons. First and foremost, progression of a small vestibular schwannoma after adequate SRS/FSRT is quite uncommon. More common is a phenomenon comparable to pseudoprogression, and the first and foremost compone...