Leprechaunism is a congenital form of extreme insulin resistance (a group of syndromes that also includes Rabson-Mensenhall syndrome, type A insulin-resistance syndrome, and acquired type B insulin-resistance syndrome) characterized by intrauterine and mainly postnatal severe growth retardation. The disease is Monarch Disease Ontology term MONDO_0009517 (Donohue syndrome). Also known as: Leprechaunism, leprechaunism.