LAUSR

To the Editor: We have read with great interest the recent articles published inNeurosurgery, related to the response after radiosurgery (RS) for cystic vestibular schwannomas (VSs).1,2 During the past 20 yr, a noteworthy reflection and dilemma have been ongoing whether surveillance, microsurgery, or RS should be performed in patients with newly diagnosed VSs.3 Particularly, tumor volume and cystic component have been considered related to tumor response and control after RS.1 VSs (small to medium size tumors) represent nowadays a common indication of RS and particularly of GammaKnife surgery (GKS). The former is related to high rates of tumor control, ranging between 89% and 98%4-7 at 5 yr, with facial nerve preservation rates between 84% and 100%.3,4,6,8-12 The prescribed doses are currently low, ranging between 11 and 13 Gy in most of the