The presence of refractile or non-refractile yellow Gass plaques in the retinal arterioles is near pathognomonic for the disease. Fluorescein angiography may demonstrate leakage in areas remote from the retinal infarctions.
The presence of refractive or non-refractive yellow Gass plaques in retinal arteries is strongly suggestive of the disease. Fluorescein angiography may indicate leakage in regions distant from the retinal necroses.