Could Vascular Structure Adjoining The Circle Of Willis Be A Matter Of Concern?

hi, my name is eral. my sister in law is having a 2.2cm vascular structure adjoining the circle of willis on the right with feedind vessels from teh right MCA and internal coroted artery. this is her MRI report .dr sanatan rath reffered her to yashoda hospital for radiosurgury. pls tell me wat i have to do, is this dangerous situation. wat is the cost for this operation.