Chiropractors are cranks but a normal muscle massage is really unlikely to cause a stroke AFAIK. The risks from Chiros as I understand it involve the big "adjustments" where they go for big pops, particularly in the neck.
I'm not a doctor but I was an athlete and the default suggestion of "my neck/knee/legs/arms hurt" -> massage is standard common wisdom. Maybe an MD would have stalled for an ultrasound but then you have all of the insurance and delay issues.