pictures of everything 30% we don't the cause cryptogenic stroke is what we call that or idiopathic some people say idiopathic means the doctors an idiot they couldn't find it right and this is frustrating for the doctor it's very frustrating for the patient because the patient wants to know why did I have a stroke it's actually a good thing overall because the prognosis for having another stroke is quite favorable if you've been very thorough and you've found no cause so even though patients are not happy overall it's a good sign