OBJECTIVE: To emphasis the need for timely diagnosis of AlstrÖm syndrome. CASE: We report a case of late-detected AlstrÖm syndrome in a boy 15 1/2 years of age who was admitted because of poor wound healing and hyperglycemia. RESULTS: Diagnosis was made and the patient's impaired glucose tolerance improved by diet. CONCLUSIONS: Regular follow-ups are needed to recognize and possibly prevent late-appearing complications.