question: hi, my 34 yr old healthy son suffered cerebral brain hemorrhage in mid-february with no prior symptoms until actual event. Then had extreme nausea, vomiting, crushing head/neck pain. 3 days later cerebral angiography done to explore area and determine damage. Neurosurgeon was unable to see actual blood vessels involved due to unreabsorbed blood sitting on the surface covering vessels involved (i m guessing similar to unresolved hematoma under skin surface) but did find abnormal fistula. 2nd procedure done 4 days after 1st and neurosurgeon said he dropped glue on the area to immobilize blood vessels believed to be involved in hemorrhage and closed off fistula with more glue . why is radiation used in the angiography & what is the glue ? they didn t inform my son that radiation would be involved and i m not getting a clear picture of it s purpose. any info appreciated. he s still experiencing pain with continued light/sound/motion sensitivity.