Basilar-ectasia-dissection-pure-arterial-malformation-what-is-it

Incidental finding

A few small holes in dorsal pons maybe suggest acquired etiology?

Another mid-basilar case below — incidental finding — no holes here.  MRAs have been stable for 5 years

Vessel wall imaging shows some asymmetric enhancement — what does it mean?

Stereos

So, what is this?  Healed dissectionPure arterial malformation?  Unknown?