Branch of the aica interposes between the cisternal segments of cranial nerve vii and viii bilaterally without significant deviation of the nerve roots, of unknown but questionable clinical significance. what could the clinical significance be?

You have posted the "clinical significance", as the report states "without significant deviation". In essence, this vascular variation is not the cause of whatever symptoms afflict you. A more thorough way of handling all of this is via a virtual consult where images can be reviewed and your issues clinically correlated. (www.connect@healthtap.com).