Hyperreflective Choroidal Foci: A Comprehensive Review.

Hyperreflective choroidal foci (HCF) are a finding on optical coherence tomography that may serve as a biomarker in various retinal and choroidal pathologies. These discrete hyperreflective spots, identified in various layers of the choroid, have been linked to inflammatory, vascular, and degenerative conditions. This review examines the clinical significance, histopathological correlation, and implications of HCF in various diseases, including diabetic retinopathy, age-related macular degeneration, Stargardt disease, choroideremia, Vogt-Koyanagi-Harada disease (VKH), idiopathic posterior uveitis, retinitis pigmentosa, and central serous chorioretinopathy (CSR), as well as non-pathological states. Although further studies are required to validate the findings in each pathology described herein, HCF may be used as a background prognostic marker of disease progression and therapeutic response, albeit with caution.