Sorry to come in late on this, but if you still want information on this here is an article from 1988 when it happened. Biden had a brain aneurysm, a condition where a blood vessel in the brain balloons out and the weakened wall ruptures.
There a few things that could cause damage - the blood creates "mass effect" pushing on the brain in the closed space of the skull, and causes severe damage or death, or the hemorrhage can cause other blood vessels in the brain to spasm, decreasing oxygen to portions of the brain. Finally, there can be problems during the surgery which damage portions of the brain. As far as I can tell from the various articles (both from 2008 and the 1988 ones) the surgeon was able to put a vascular clip on the aneurysm and the brain wasn't damaged.
It looks like his foot in mouth syndrome way predated his surgery.
It looks like his foot in mouth syndrome way predated his surgery.
Do you have any info on Obama’s right side lobotomy?
Thank you for the information. Appreciated.