Such tests take the 'viewing' of more than one expert, especially since your son has had surgery in the not so recent past.
I've waited for many CT's MRI's and PET scans chewing my nails [mentally or actually] for however long it took. Some answers have been good, a couple not so. I'm still here?
I've made a game with myself that good results take longer! Keep that in mind as the days go by and you get that phone call at 6:30pm- that's when most docs tend to call me w/results?
Hoping for YOU and your son that results are not really problems!!! Please let us know? Sending good thoughts.....
's - j