Your understanding is correct. The scar from the previous operation could be the irritative focus that produces the epilepsy
. To try and establish this hypothesis, you would undergo various tests that would include MRI
scan and other scans, neuropsychological testing, scalp
EEG's including possibly telemetry which includes a period of stay in the hospital where you will be hooked up with wires recording the EEG continuously and a camera recording you as well. After all this, the doctors would sit together and decide if you will need a period of intracranial monitoring where the EEG electrodes are placed after opening your skull over the area of scar. With this further testing to check the function of the surrounding areas of the brain will be done. Following this, the surgery to remove the scarred tissue will be performed.
Yes, MNI is one of the worl's most experienced centres doing this type of work. But there are other centres across Canada and the US which do the same type of operation as well.