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A classic case of progeria (Hutchinson‐Gilford syndrome) in a 9‐year‐old Japanese boy is presented. The characteristic clinical features in this patient were similar to those reported in the literature. The total amount of acid glycosaminoglycans excreted in the urine was within the normal range, but there was an increase in hyaluronic acid excretion. The hyaluronuriawas a novel finding in progeria, providing a common linkage with the hyaluronuria found in Werner's syndrome.