idiopathic means they don't know where it came from, they can't point to the reason. This could be a good sign, because it means they didn't find any really bad stuff, but it also means they don't know what caused it, and Roberts is only 52, which is pretty young.
This is the passage from medicinenet:
A seizure is the uncontrolled electrical activity in the brain, which may produce a physical convulsion, minor physical signs, thought disturbances, or a combination of symptoms.
The type of symptoms and seizures depend on where the abnormal electrical activity takes place in the brain, what its cause is, and such factors as the patient's age and general state of health.
Seizures can be caused by head injuries, brain tumors, lead poisoning, maldevelopment of the brain, genetic and infectious illnesses, and fevers. In fully half of the patients with seizures, no cause can yet be found.