Adult ALL with isolated CNS relapse

Just got called to see an adult patient in her 50s with h/o ALL, s/p allo transplant 5+ years ago. Now presents with isolated CNS relapse with some evidence of leptomeningeal disease near the lesion. I've yet to see the images, but per report no evidence of spinal disease. Our program does do TBI, so I see a fair number of leukemia patients. How would you dose/fractionate? I know kids with ALL are treated to 18-24 Gy (18 Gy more commonly now I believe) to the brain and 6 Gy to the spine,... Adult ALL with isolated CNS relapse
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