Follow-up       No of patients      10 Duration mean   2.8 y   range   1.5 - 6.5 y Tumor volume increased   0   stable   8   decreased   2 Hearing outcome cophosis before treatment   5   unchanged (GR 2) 2   worsened (GR 2→3) 1     (GR 2→5) 2

Table 3: Outcome data. Legend: GR=Gardner-Robertson classification.