paresthesias or paresthesiae? - wondering

Good morning.  I have a doctor who consistently says paresthesiae and spells it this way when making corrections.  The word paresthesia is in Stedman's but not paresthesiae.  However, I do see it spelled this way on certain web sites, but most of the dictionaries I look at use paresthesias for the plural form.  Can someone help me settle this one way or the other?  I have always used paresthesias as the plural form but maybe I have been wrong, especially since the doctor so consistently says paresthesaie.  Thanks for the help.