Atypical anastomotic malignancies of small bowel after subtotal gastrectomy with Billorth II gastroenterostomy for peptic ulcer: Report of three cases and review of the literature.

AIM: To present patients who developed small-bowel malignancy at the level of the gastrointestinal anastomosis decades after a subtotal gastrectomy for ulcer, to review relevant literature, and to attempt to interpret the reasons those cancers developed to these postsurgical non-gastric sights.

METHODS: For the current retrospective study and review of literature, the surgical and histopathological records dated from January 1, 1993 to December 31, 2017 of our department were examined, searching for patients who have undergone surgical treatment of small-bowel malignancy to identify those who have undergone subtotal gastrectomy for benign peptic ulcer. A systematic literature search was also conducted using PubMed, EMBASE, and Cochrane Library to identify similar cases.

RESULTS: We identified three patients who had developed small-intestine malignancy at the level of the gastrointestinal anastomosis decades after a subtotal gastrectomy with Billroth II gastroenterostomy for benign peptic ulcer-two patients with adenocarcinoma originated in the Braun anastomosis and one patient with lymphoma of the efferent loop. All three patients were submitted to surgical resection of the tumor with Roux-en-Y reconstruction of the digestive tract. In the literature review, we only found one case of primary small-intestinal cancer that originated in the efferent loop after Billroth II gastrectomy because of duodenal ulcer but none reporting Braun anastomosis adenocarcinoma following partial gastrectomy for benign disease. We also did not find any case of efferent loop lymphoma following gastrectomy.

CONCLUSION: Anastomotic gastric cancer following distal gastrectomy for peptic ulcer is a well-established clinical entity. However, malignancies of the afferent or efferent loop of the gastrointestinal anastomosis are extremely uncommon. The substantial diversion of the potent carcinogenic pancreaticobiliary secretions through the Braun anastomosis and the stomach hypochlorhydria, allowing the formation of carcinogenic factors from food, are the two most prominent pathogenetic mechanisms for those tumors.