INS and congenital isolated hyperinsulinism: In addition to its accuracy in diagnosing focal form of CHI non-invasively, Additionally, the 18F-Fluoro-L-DOPA PET has been more accurate in differentiating focal and diffuse disease than invasive procedures such as trans-hepatic portal venous insulin sampling (THPVS) and arterial calcium stimulation with hepatic vein insulin sampling (ASVS) [24].