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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Choroidal abnormalities in birdshot chorioretinopathy: an indocyanine green angiography study.
Eye 1997
Birdshot chorioretinopathy is a rare inflammatory disorder with an insidious onset that can slowly progress to severe visual loss. The pathogenesis is unknown. This study used indocyanine green (ICG) angiography to investigate the degree of choroidal vascular involvement with progression of disease and to determine the nature of the birdshot lesions. Seven patients with birdshot chorioretinopathy had ICG angiography performed with a scanning laser ophthalmoscope at various stages of clinical disease. Results were compared with fluorescein fundal angiography (FFA). All large choroidal vessels appeared normal. The birdshot lesions were demonstrated with ICG but not with FFA and were represented by dark areas on ICG angiography. Typically these areas were bordered by large or medium-sized choroidal vessels and their appearance suggested small choroidal vessel hypoperfusion. In disease of recent onset, some lesions masked fluorescence from large underlying choroidal vessels possibly due to inflammatory choroidal infiltrates. In long-standing disease, the choroidal angioarchitecture was relatively normal within the birdshot lesions. This study of birdshot chorioretinopathy demonstrates abnormalities in the small choroidal vessels within the birdshot lesions. ICG angiography detects the birdshot lesions more readily than FFA and may be of benefit in assessing disease activity.
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