It is a warning sign. Imaging shows abnormalities, but the symptoms and images
improve. Might I suggest you ask for an MRI
instead of a CT scan. My daughter had a stroke whilst playing volleyball at school. A CT scan was non specific, an MRI showed a massive stroke originating in the MCA decimating the basal ganglia, entire caudate and lentiform areas of the brain. She followed this first stroke with a hemorragic stroke further damaging the brain.