A hypoglycaemic ‘Peter Pan’: a paediatric disease in an adult patient?

All patients who suffer seizure should have a blood glucose measured. Unrecognised hypoglycaemia in a neonate or infant confers a high risk of subsequent neurological damage. Persistent hyperinsulinaemic hypoglycaemia (PHH) in adults is highly likely to be caused by insulinoma, but diffuse pancreatic hyperinsulinism, particularly after bariatric surgery, should also be considered. Medical therapy of endogenous hyperinsulinaemic hypoglycaemia is complex, requiring intensive monitoring.