INS and Hypoglycemia: Hyperinsulinaemic hypoglycaemia was confirmed (critical sample at the time of hypoglycaemia: glycaemia at 21 mg/dL and insulin at 21.9 uIU/mL [normal value during hypoglycaemia: <2 μIU/mL], C-peptide at 2.2 ng/mL [normal value during hypoglycaemia <0.5 ng/mL], and urine ketones were not detected.