Rabson-Mendenhall syndrome in a 6-year-old girl.
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Many factors such as obesity, growth hormone, glucagon and genetic defects are possible causes of insulin resistance, which results in a non-optimal response of the glucose metabolism and therefore an increased release of insulin. Insulin resistance is of a higher degree when it is linked to a genetic syndrome. Genetic syndromes of varying severity associated with insulin resistance have been identified (2, 3), ranging from the severe phenotype of Donohue syndrome to the milder phenotype of Rabson-Mendenhall syndrome. Patients initially have normal blood glucose values with concomitant increase in insulin levels; these changes are due to INRS mutations with impaired insulin clearance; a small percentage of patients have autoantibodies against INRS, which are responsible for impaired glycemic control […].