He was admitted twice in a county hospital; although it was noticed that hypoglycemia (ranging from 14 to 38 mg/dL) would promptly return to normal values after glucose intravenous infusion, the levels of circulating insulin, as well as the abdominal ultrasound and abdominal computed tomography (CT) scan, were reported within normal range. The gene discussed is INS; the disease is Hypoglycemia.