Posted 12/2/2019 2:30 PM (GMT -7)
Ok, here is what I read.
"Occasional t2 hyperintensities within the periventricular white matter which are nonspecific."
The guy is scanning across the picture of white matter, looking for weirdness. All he sees are that occasionally there are spots of "hyper-intensity" which are not specific to any particular cause. Like scanning your eyes across a painted wall...every once in a while you might notice a blob in the paint, but there isn't any specific cause as to why that blob is there, and it isn't a pattern, it just occasionally shows up.
Y'all are linking "occasional" to changes in time, but it's really just changes in where on the scan (picture) one is looking.