Hi and Welcome to the Cardio Forum, rrettakay!!
This is the first I've heard of this, so we'll learn together...I found a sight that I find quite reliable to help somewhat with this.
http://www.emedicine.com/neuro/topic572.htm
I'll continue to hunt down some other sites that explain the, 'Cavernous Aneurysm'.
Again, welcome and please let me know how you are doing!!
Hugs, Teri