PMC3806188_01
Axial T1 postgadolinium enhanced MRI showing the lesion of the left trigeminal nerve at the time of its original diagnosis as trigeminal schwannoma.
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Two months later, another MRI revealed a slight increase in size of the lesion (Figure 1).
Three-dimensional rendering of the tumor in treatment planning of the patient's first GKRS treatment; the tumor is highlighted and is posteroinferior to the optic nerve which is also highlighted.
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Three months after her initial presentation, the patient received her first Gamma Knife treatment of 13 Gy at the 50% isodose line (Figure 2).
Sagittal treatment planning MRI for the patient's second GKRS treatment showing increased size and the tumor with the Gamma Knife isodose lines in coronal, sagittal, and axial views.
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 Based on this revised diagnosis, the patient received a 5-part fractionated Gamma Knife treatment of 6 Gy to the 50% isodose line each time for a total of 30 Gy (Figure 3).