I think my son may have had a mini stroke about a month ago that was not diagnosed because of other health concerns at the time. He is only 10 years old. His sypmptoms were extreme, sudden headache- he was screaming and holding his head, slurred speach, confusion, his blood pressure was extremely high,and his platelet count ws also very elevated at the time because of the other health issues I mentioned.  This happened 2 times within a couple of days and left him very ill. WOuld it still show on an mri? Is it important to diagnose at this point if it were a stroke?
Strokes always show on MRI because MRI is very sensitive to tissue damage. Strokes in kids mainly happen because of blood vessel tears, blood vessel diseases, and heart conditions. If the other symptoms were not related to any of these and didn't show up on MRI it was unlikely to be a stroke.  High blood in the brain can cause headache and confusion if it rises high enough fast.  These are all common problems in medicine, and it is likely that they were properly evaluated.  You should express your concerns to his doctors do they can be ad Chat Doctor.