Treatment planning information from an example left-sided vestibular schwannoma patient.Axial computed tomography (CT) scan co-registered with magnetic resonance imaging (MRI) showing the treatment plan. The outlined tumor volume (blue shading) was expanded by 1.25 mm to create the planning target volume (PTV) (red shading). A high-degree of conformality was achieved between the PTV and the prescription isodose line (green contour line representing 2100 cGy). The surrounding isodose contours show sharp dose fall-off away from the tumor target with good sparing of the cochlea (magenta shading).