HYPERREFLECTIVE DEPOSITION IN THE BACKGROUND OF ADVANCED STARGARDT DISEASE.

Abstract

To describe an unusual manifestation of hyperreflective deposits in the subretinal space in a group of patients with clinically and genetically confirmed Stargardt disease. Retrospective review of color fundus, autofluorescence, infrared reflectance, red-free images, and spectral domain optical coherence tomography in 296 clinically diagnosed and genetically confirmed (2 expected disease-causing mutations in ABCA4) patients with Stargardt disease. Full-field electroretinogram (ffERG), medical history, and genotype data (in silico predictions) were further analyzed from the selected cohort. Eight of 296 patients (2.7%) were found to exhibit small crystalline deposits that were detectable on certain imaging modalities, such as color, infrared reflectance and red-free images, but not autofluorescence. The deposits were most prevalent in the superior region of the macula, and spectral domain optical coherence tomography revealed their presence in the subretinal space. All patients presented with these findings at a notably advanced disease stage with abnormal ffERG and a high proportion of highly deleterious ABCA4 alleles. Hyperreflective subretinal deposits may be a manifestation of advanced ABCA4 disease, particularly in regions susceptible to disease-related changes, such as lipofuscin accumulation.