Angioid streaks in sickle-thalassemia

Area of Science:

• Ophthalmology
• Hematology
• Genetics

Background:

• Angioid streaks are associated with various diseases, including hemoglobinopathies like sickle cell anemia and beta-thalassemia.
• Pseudoxanthoma elasticum is a rare genetic disorder affecting elastic tissue.

Purpose of the Study:

• To investigate the prevalence of angioid streaks and pseudoxanthoma elasticum in patients with compound heterozygous traits for hemoglobin S and beta-thalassemia.
• To identify potential correlations between these conditions and hematologic parameters.

Main Methods:

• A cohort of 58 consecutive patients with sickle-thalassemia was examined.
• Ophthalmic examination for angioid streaks and dermatologic assessment for pseudoxanthoma elasticum were performed.
• Skin biopsies confirmed pseudoxanthoma elasticum lesions.
• Hematologic and biochemical parameters were analyzed.

Main Results:

• Angioid streaks were identified in 10% (6/58) of patients.
• Three patients with angioid streaks also had pseudoxanthoma elasticum.
• No significant differences in hematologic/biochemical parameters were found between patients with and without angioid streaks, except for a higher prevalence of beta(0)-thalassemia in those with angioid streaks.
• No similar cases were found in relatives.

Conclusions:

• Angioid streaks and pseudoxanthoma elasticum occur with increased frequency in patients with sickle-thalassemia.
• The thalassemic component in affected patients was exclusively beta(0)-thalassemia.
• Further research is warranted to elucidate the specific mechanisms linking sickle-thalassemia to these conditions.