Condition Description. Truncus arteriosus is an uncommon congenital heart defect where a baby is born with a single blood vessel (called a truncus) coming from the main pumping chambers of the heart (the ventricles) instead of two vessels (one from each ventricle).ondition Description. Truncus arteriosus is an uncommon congenital heart defect where a baby is born with a single blood vessel (called a truncus) coming from the main pumping chambers of the heart (the ventricles) instead of two vessels (one from each ventricle).
IRS Office Customer Service Phone Number Phone Number: 1 (800) 829-1040. Shortcut: N/A - Edit
Quick Answer. The phone number for the Internal Revenue Service Taxpayer Assistance Center in Austin, Texas is 512-499-5127, according to the IRS. Located at 825 East Rundberg Lane, the center is open from 8:30 a.m. to 4:30 p.m. by appointment only as of 2015. Continue Reading.