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Angioid streaks in sickle-thalassemia.

Angioid streaks have been described in a diverse group of diseases including hemoglobinopathies such as sickle cell anemia and beta-thalassemia. We investigated the prevalence of angioid streaks and pseudoxanthoma elasticum in the rare situation of patients who had compound heterozygous traits for hemoglobin S and beta-thalassemia. We examined 58 consecutive patients with sickle-thalassemia. Of these, 25 were men and 33 were women, and they ranged in age from 19 to 58 years (mean, 32.6 years). Angioid streaks were identified in six of 58 patients (10%), and of these three also displayed the cutaneous lesions of pseudoxanthoma elasticum, which were confirmed by skin biopsy. An expanded study on several relatives of the patients with angioid streaks failed to identify any similar cases. Statistical evaluation of the main hematologic and biochemical parameters in the patients with and without angioid streaks did not demonstrate any significant differences, except that the thalassemic component in all six patients with angioid streaks was beta(0) (that is, did not allow the synthesis of hemoglobin A). We conclude that angioid streaks and pseudoxanthoma elasticum skin lesions occur with an increased frequency in patients with sickle-thalassemia.

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