Gastric bypass surgery for treatment of hypothalamic obesity after craniopharyngioma therapy

Background A 14-year-old boy presented with daytime somnolence, intermittent emesis and hypothyroidism. Neuroimaging revealed a calcified suprasellar intracranial mass, suspected to be a craniopharyngioma. Subtotal resection of the tumor confirmed the diagnosis. Extreme obesity (BMI >60 kg/m 2 ) and hyperinsulinemia followed tumor resection and cranial irradiation. Dietary interventions were unsuccessful, and pharmacologic intervention (i.e. octreotide) only slowed the rate of weight gain. Investigations Radiography documented the suprasellar mass. Following surgical resection and radiotherapy, hypothalamic–pituitary deficiencies were found. Preprandial and postprandial excursions of insulin, active ghrelin and leptin were measured before and after gastric bypass surgery. Diagnosis Panhypopituitarism, hypothalamic obesity and hyperinsulinemia following craniopharyngioma therapy. Management Severe caloric restriction, octreotide, and pituitary hormone replacement did not produce weight loss. Gastric bypass surgery led to reduced food cravings, significant weight loss, and amelioration of obesity-related comorbidities. Correction of fasting hyperinsulinemia, normalization of postprandial insulin responses, and reductions in active ghrelin and leptin concentrations were also observed.