portal. 512.509.2225. SCHEDULE ONLINE. Location {{locAOne}} {{locATwo}} {{locHrMsg}} More Hours---LOCATION DETAILS. About Aren Alexander Paiva, PAC. Aren's area of interest is in spine surgery. He has a passion for patient care and assists Dr. Santman's practice. Languages English. Ages Seen Geriatrics, Adults, Adolescents (ages ....