Is there such thing as inoperable aaa?

Yes and no: Pretty much any aneurysm is repairable with an open or endovasculat approach. What would make an aaainoperable is the status of the patient. If someone is too sick to have AAA repair, the AAA may be considered inoperable.

Yes and No.: Any AAA can be fixed - but many shouldn't. That term has more to do with the patient than with the aaa. Every procedure has risk and if the risk outweighs the benefit then a patient might be called "inoperable". The patient need to be evaluated at a high volume referral center. I operate on several "inoperable" patients a year.

Inoperable AAA: Absolutely. On occasion the magnitude of the repair needed when one considers the overall condition (the person's medical condition) of the person with the AAA make going forward too dangerous.