PMC4982345_01
T1 magnetic resonance imaging of the brain, axial post-contrast sequences, showing right external capsule lesion before stereotactic radiosurgery (left), 3 months following stereotactic radiosurgery (middle), and after treatment with bevacizumab (right)
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F1
The patient underwent stereotactic radiosurgery (Gamma Knife Perfexion, Elekta Inc., Stockholm, Sweden) to a 7.0 x 8.0 x 8.0 mm brain metastasis involving the right external capsule [Figure 1 left]. Magnetic resonance imaging (MRI) showed that the lesion had increased to 23.0 x 28.0 x 25.0 mm, with significant surrounding edema [Figure 1 middle]. MRI showed some decrease in the size of the lesion and a significant decrease in the surrounding edema [Figure 1 right].
Planning magnetic resonance images for stereotactic radiosurgery to a lung-primary brain metastasis. The panel on the left depicts the tumor prescribed a 20 Gy dose to the 45% isodose line with a gradient index of 2.91. The right panel additionally shows the 10 Gy and 5 Gy lines
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F2
The tumor was prescribed a 20 Gy dose to the 45% isodose line with a gradient index of 2.91 [Figure 2].