Karlin
Sorry to hear about your father's troubles.
Stroke can be such a difficult thing to detect at times.Nothing showed up on the scan, which likely means it is "other" than a blood clot problem. [About that, I am not sure if an 'inj.site hemotoma' can be caused from a
vaccination needle, usually that happens from repeating same site pokes, not a first-time as no "old dry blood" was there...]
It isn't allways a stroke that causes those symptoms either - many "brain injuries" do the same thing to us as strokes do, right? [Concussion, for eg.]
This brings up the idea that the Vaccine's contents may have done the harm - mercury is in it if Thimerisol was ued for the preservative, it preservative was needed for this flu shot - normally they do use it, yes.
You absolutely must try and find out from the VA what was in the shot... ask about preservative and don't let them shrug it off, which they will try to do - "oh, you don't need to know if it is in there or not, we know it is safe". Don't believe the medical staff, they have been highly trained by the pharmaceutical industry themselves [brainwashed].
Good luck - how is your father doing now?
Karlin