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Figure 1: (a) Left vestibular schwannoma at the time of gamma knife radiosurgery; (b) MRI at the end of 6 months showing an increase in the extracanalicular portion of the tumor (pseudo-progression) with subtle hypointensity inside the tumor; (c) magnetic resonance imaging at the end of 1 year showing gradual regression of the tumor volume; and, (d) 2 years follow-up MRI showing significant volumetric reduction of the tumor

Figure 1: (a) Left vestibular schwannoma at the time of gamma knife radiosurgery; (b) MRI at the end of 6 months showing an increase in the extracanalicular portion of the tumor (pseudo-progression) with subtle hypointensity inside the tumor; (c) magnetic resonance imaging at the end of 1 year showing gradual regression of the tumor volume; and, (d) 2 years follow-up MRI showing significant volumetric reduction of the tumor