Evolution of bariatric surgery: a historical perspective.

OBJECTIVE. Older legacy bariatric surgical procedures, including jejunocolic bypass, jejunoileal bypass, vertical banded gastroplasty, and biliopancreatic diversion, are no longer performed. Biliopancreatic diversion with duodenal switch is still performed in select centers. Although the legacy procedures are no longer performed, there are still patients who have undergone these surgeries in the past who are currently either under continuous surveillance or are being evaluated for surgical conversion or revision because of complications or weight regain. The purpose of this article is to describe the evolutionary development of various bariatric surgical techniques and the associated surgical anatomy. Because these procedures are no longer performed, only limited imaging of legacy bariatric surgeries is available for radiologic demonstration. CONCLUSION. Although earlier bariatric surgical techniques are no longer favored, there are still patients who underwent these procedures who require imaging evaluation for clinical follow-up or surgical revision. Understanding the radiologic-surgical anatomy of these older bariatric procedures can help in the prompt and appropriate management of these patients.