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Objective: The objective of the study was to describe the characteristics of patients with insulinoma in three hospitals in Medellin, Colombia, between 2002 and 2017. Methods : A retrospective analysis of patients with hyperinsulinemic hypoglycemia and histologic confirmation of insulinoma was conducted. Results : A total of 19 cases were identified. Ten women (52.6 %) and 9 males (47.4 %). The mean age at diagnosis was 43 years (S.D: 15.5). Four cases had multifocal insulinoma (21.1%), 3 cases were secondary to multiple endocrine neoplasia type 1 (15.8 %), and 2 of them were malignant (10.6 %). All patients presented fasting hypoglycemia, and 63.2% presented post-prandial hypoglycemia.  Glucose nadir in the fasting test occurred in the first 48 hours in all cases, with a mean time to hypoglycemia of 9 hours (S.D 8.0). The biochemical diagnosis was done with increased insulin in the presence of hypoglycemia. C-peptide was done in 9 patients (47.3 %), and sulfonylureas in 2 cases (11.1 %). Preoperative localization was done by imaging in 12 cases (68.5 %), and invasive tests were required in 6 cases (31.5 %). Localization tests were positive as follows: magnetic resonance imaging in 83%, endoscopic ultrasound in 50%, selective intra-arterial calcium injection in 50 %, and intraoperative ultrasound in 100%. Eighteen patients (94. 7%) underwent surgery. Mortality (15.8 %) was secondary to early post-operative complications. Conclusions: The characteristics of patients with insulinoma in Medellin are similar to other series. However, there are important local limitations for proper biochemical testing and imaging localization. This is the largest study in our country.

Descripción de la experiencia en pacientes diagnosticados con insulinoma. Estudio multicéntrico en Medellín, Colombia