Adrian E. Ortega, MD

Clinical Professor of Surgery (Clinician Educator)

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Dr. Ortega graduated from the Harvard Medical School in Boston, MA and completed his surgical training here at the University of Southern California. After a time in private practice, he went on to complete his training in colorectal surgery at USC, then joined the faculty. Dr. Ortega works primarily out of the LAC+USC Medical Center, serving as a mentor, teacher, and supervisor of fellows, residents, and medical students in training.

Dr. Ortega’s major areas of research interests include Diverticular disease, Anorectal Conditions, and Colon and Rectal Cancer.


  • Outcomes of colostomy takedown following Hartmann’s procedure: successful restoration of continuity comes with a high risk of morbidity Colorectal Dis. 2021 Apr; 23(4):967-974. . View in PubMed
  • LigaSure™ haemorrhoidectomy and the risk of postoperative bleeding Colorectal Dis. 2021 10; 23(10):2699-2705. . View in PubMed
  • Adaptive mHealth Intervention for Adolescent Physical Activity Promotion J Pediatr Psychol. 2021 06 03; 46(5):536-546. . View in PubMed
  • Current Advances in Colorectal Surgery in Latin America: Insights on the 2019 Latin American Association of Coloproctology Congress Dis Colon Rectum. 2020 09; 63(9):1223-1224. . View in PubMed
  • Differences in adolescent activity and dietary behaviors across home, school, and other locations warrant location-specific intervention approaches Int J Behav Nutr Phys Act. 2020 09 29; 17(1):123. . View in PubMed
  • Responsive Asthma Care for Teens (ReACT): development protocol for an adaptive mobile health intervention for adolescents with asthma BMJ Open. 2019 08 20; 9(8):e030029. . View in PubMed
  • Operative management of diverticulitis in a tertiary care center Am J Surg. 2017 Jul; 214(1):37-41. . View in PubMed
  • Selected Techniques of Anal Fistula Surgery from Antiquity Through the Early 20th Century Illustrated Dis Colon Rectum. 2017 Jun; 60(6):636-646. . View in PubMed
  • Treatment-Based Three-Dimensional Classification and Management of Anorectal Infections World J Surg. 2017 02; 41(2):574-589. . View in PubMed
  • Factors Associated with a Short (<2 Days) or Long (>10 Days) Length of Stay after Colectomy: A Multivariate Analysis of over 400 Patients Am Surg. 2016 Oct; 82(10):960-963. . View in PubMed
  • The Author Replies Dis Colon Rectum. 2016 May; 59(5):e42. . View in PubMed
  • Requiem on the Deep Postanal Space and Supralevator Abscesses Dis Colon Rectum. 2016 07; 59(7):e409. . View in PubMed
  • Elective versus emergency surgery for ulcerative colitis: a National Surgical Quality Improvement Program analysis Am J Surg. 2013 Mar; 205(3):333-7; discussion 337-8. . View in PubMed
  • Recurrent drug-induced ANCA vasculitis in a patient with Crohn’s colitis treated with infliximab: a potential contraindication to immunosuppressive therapy Am Surg. 2012 Dec; 78(12):1406-8. . View in PubMed
  • Laparoscopic versus open colon resections in California: a cross-sectional analysis Am Surg. 2012 Oct; 78(10):1063-5. . View in PubMed
  • Current controversies in the management of colon cancer Curr Probl Surg. 2012 Jul; 49(7):398-460. . View in PubMed
  • Perineal injuries at a large urban trauma center: injury patterns and outcomes Am Surg. 2009 Apr; 75(4):317-20. . View in PubMed
  • The prevalence of colorectal neoplasia in patients with end-stage renal disease: a case-control study Int J Colorectal Dis. 2008 Jan; 23(1):47-51. . View in PubMed
  • Assessing the teaching of procedural skills: can cognitive task analysis add to our traditional teaching methods? Am J Surg. 2008 Jan; 195(1):20-3.. View in PubMed
  • Pseudoaneurysm of the inferior gluteal artery: an unusual complication after abdominoperineal resection for rectal cancerReport of a case. Dis Colon Rectum. 2007 Jan; 50(1):115-7. . View in PubMed
  • Intraoperative physical diagnosis in the management of anal fistula Am Surg. 2006 Jan; 72(1):11-5. . View in PubMed
  • Internet use by colorectal surgery patients: a surgeon’s tool for education and marketing Am Surg. 2004 Jun; 70(6):553-8. . View in PubMed
  • Sequential compression devices as prophylaxis for venous thromboembolism in high-risk colorectal surgery patients: reconsidering American Society of Colorectal Surgeons parameters Am Surg. 2003 Nov; 69(11):941-5. . View in PubMed
  • Use of high-dose-rate brachytherapy in the management of locally recurrent rectal cancer Dis Colon Rectum. 2003 Jul; 46(7):895-9. . View in PubMed
  • Anorectal anatomy Surg Clin North Am. 2002 Dec; 82(6):1125-38v. . View in PubMed