No. Both are equally dangerous.
ALL aneurysm's are bad !
An aneurysm is a weakening in the wall of a blood vessel. This causes the blood to pool and push against the weak spot as it flows through the vessel, developing the ballooning or blossoming effect on the side of the vessel. This is very dangerous, the larger and faster the ballooning, the more dangerous. The vessel becomes weaken and brittle at the stretched point, and you do not want it to rupture, especially if it is in a vital area. There are several ways to fix an aneurysm, depending on where is it and how big it has gotten. I know that the basilar artery is located at or near the base of the skull, But that still leaves alot details out. That's the best I can do with the info, you gave and requested. This is a very fearful thing, but most can be handled with quick action, and proper care.
Basilar Migraine is a type of migraine that affects the basilar artery of the brain.
It means that they couldn't find any saccular aneursyms. But since aneursyms 3mm or less sometimes can't be seen on an MRA, they can occasionally be missed when they are that tiny. However, if you're going in for a specific problem (such as headaches), an aneursym would most likely be larger or leaking. If an aneurysm were leaking - they would have seen it on a regular MRI.
Basically means that the basilar artery (supplying blood to the brain) is widely open. So it could mean that its normal (arteries should be open!) or referring to the artery being dilated (an aneurysm). Though if this is something you've heard your doctor say referring to yourself I would recommend you just ask them what they meant :)
"The basilar artery is vital to the brain."
3mm.
3mm = 0.12inch.
about 3mm
3mm = 0.3 cm
I think basilar membrane is the receptors for sounds stimuli.