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Background Elevated serum ferritin levels are common findings in clinical practice, usually caused by inflammation, liver disease, high alcohol consumption or malignancy, although it can occur in association with rare genetic conditions. Case presentation We describe a male in his sixties with persistent hyperferritinaemia without associated iron overload and subsequent development of cataract. The patient himself suggested hyperferritinaemia-cataract syndrome as a diagnosis, which was subsequently confirmed with mutation analysis of the light chain ferritin (FTL) gene. Such mutations are inherited in an autosomal dominant pattern. Interpretation Mutations in FTL are known to interfere with the balance between iron levels and ferritin production. When common causes of hyperferritinaemia are excluded, rare conditions should be considered in order to avoid unnecessary procedures and treatment. Genetic analyses are available for all clinicians and should be requested upon the right indications.