Since PFAPA shares clinical similarities with monogenic fever syndromes, several studies have investigated the possible involvement of the genes responsible for Familial Mediterranean Fever (MEFV gene), TNF-Receptor Associated Periodic Syndrome (TNFRSF1A gene), Mevalonate kinase deficiency (MVK gene), and Cryopyrin-Associated Periodic Syndrome (NLRP3 gene) in PFAPA cohorts (15). The gene discussed is MVK; the disease is hyperinsulinemic hypoglycemia, familial, 4.