Gastric mesenchymal tumors as incidental findings during Roux-en-Y gastric bypass.

BACKGROUND: Occurrences of mesenchymal tumors have been more recognized in recent years, and the incidental diagnosis of these lesions during bariatric surgery has been previously reported.

OBJECTIVE: To describe the cases of incidentally diagnosed mesenchymal tumors during consecutive bariatric surgeries.

SETTING: Private health-providing service, Brazil.

METHODS: A retrospective population-based study, which enrolled individuals who consecutively underwent Roux-en-Y gastric bypass at a single center from January 2006 through July 2016.

RESULTS: Of 1502 individuals, there were 16 cases (1.1%) of confirmed mesenchymal tumors. Of these 16 cases, 14 (87.5%) were gastrointestinal stromal tumors and 2 (12.5%) were leiomyomas. The affected individuals were significantly older (aged 46.2 ± 6.3 versus 35.4 ± 7.2 yr; P = .00031), presented a lower body mass index (38.2 ± 5.1 versus 45.3 ± 8.1 kg/m2 ; P<.00001), and had a lower weight (102.1 ± 17.9 versus 121.1 ± 7.4 kg; P = .00321). None of the individuals presented reported relapses of the mesenchymal tumors.

CONCLUSION: The possibility of incidental gastric mesenchymal tumors during bariatric surgery should not be neglected; a careful inventory of the stomach at the beginning of the procedure and resection of lesions found are mandatory. (Surg Obes Relat Dis 2017;X:XXX-XXX.) © 2017 American Society for Metabolic and Bariatric Surgery. All rights reserved.