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6 Cards in this Set
- Front
- Back
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What is gamma knife used for?
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glomus tumors, VS, and meningiomas. cyber knife is essentially the same thing
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rates of facial weakness in Gamma knife? hearing?
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1-1.5%, usually mild and brief. hemifacial spasms 1-2 years out, usually improve overtime. 50% have hearing decline over time.
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how does gamma knife work?
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1 treatment, metal pins holding a frame on the head, uses the frame for image guidance (usually MRI, s/t CT scan), certain openings within the helmet allow radiation in at strategic places....kinda like IMRT. 50% isodose goal is 15 Cgy.
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what happens to the tumor with gamma knife
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does not shrink immediately, can even grow a little bit in the first year due to edema from XRT.
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indications for gamma knife
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< 3 cm, growing, elderly, recurrent tumor, patient choice. (don't radiate larger turmors due to edema issues causing hydrocephalus or brainstem compression and may not work well on large tumors).
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rates of success
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70-99% (we quote 80-85%).
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