I was originally told I had a 1mm infundibulum. They then did a CT of carotids which said it was a 2mm PCOM aneurysm. I met with neurosurgeon a few days back when he said it was either a large infundibulum or small aneurysm. He wasn’t able to answer my questions as he said I need digital subtraction angiography before they can answer with certainty. I accept that. What I cannot understand is - if the type of lesion is in question, how can one be large and the other small? Surely they’d be the same size?
He left the report on the screen and I read it. It said - large infundibulum with small aneurysm but when I queried this, he said, ‘it’s either one or other not both’ …
If I get the DSA done and it’s an aneurysm, I’ve to get a shunt. I saw the following - ‘‘FDA Cautions on Stents for Unruptured Brain Aneurysms’’, which makes me wary.
If it’s an aneurysm (and they’re sure it’s small), why the need for a stent and not coil? I know I’m jumping ahead but I need to make sure the dsa will be worthwhile before I agree. I think, like the written report said, that I have a large infundibulum which is turning into an aneurysm.
I too have either an infundibulum but could possibly be an aneurysm but most likely not. Mine is also 2mm and I might have a an aneurysm on the Acom that is sub milliliter.
The “infundibulum is 2mm and is considered small so I’m not sure why they would say yours is large. Are you having a follow up MRA or CTA in 6 months?
I think the only way the know 100% is by a DSA.
I also thought they coil and not stent but that’s the doctor I’m seeing does.
It sure does get confusing
I don’t see the conflict between definitions large infudibulum or small aneurysm . They don’t know yet is it one or another. The doctor will see more closely during angiogram . I would recommend taking step by step 
. Only after angiogram the treatment plan will be clear for doctors , I think …
So here’s what I could find that’s recent https://www.sciencedirect.com/science/article/abs/pii/S1878875018328171