stroke caused by radiation

Does anyone have any experience dealing with a stroke caused by late effects of radiation?  My mom's recent MRI revealed a stroke close to the area that was radiated 5 years ago.  We thought it was going to be a tumor recurrence, and we were surprised by a stroke instead. 

The neuro oncologist told us she was more suseptable to stroke due to the damage to the blood vessels of the brain from radiation.  The stroke is on the periphery of the main area that was radiated.  He also said it is impossible to know for sure,  so he ordered a test on her carotid arterys, which was normal, and an echo of her heart to rule out large vessel issues (like plaque).  It could be that she just had a stroke, but he thought it unlikely in her case.  So, now she has left sided weakness from the radiation, and increased left sided weakness, loss of balance, and loss of coordination from the stroke.  She essesntially went from requiring stand by assist for everything, to needing moderate to maximum assist for ambulation and all ADLs, so our lives have changed drastically.  She is now also depressed. 

my sister had radiation and gamma knife surgery due to a brain tumor. for a while there was no problems then 6 weeks ago she had a mini stroke the dr said the radiation can damage the blood vessels and cause these strokes he said she would more then likely have more and they would end up having them and eventually have a massive one. She jsut had a nother one here and it think  she had a real small one a week ago did not actually witness anything but little signs have been popping up we took her back again the other day and she had another one  this one was a little worst then before  so now if the cancer doesnt kill her it will probably be a stroke  this is so painful seeing her like this she is two years younger then me and i dont know how to handle seeing her like this and sad part of it is there is nothing they can do.