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Published on: August 11, 2023
FROM DRUSEN TO TYPE 3 MACULAR NEOVASCULARIZATION.
Elodie Bousquet1,2, Ahmad Santina1, Giulia Corradetti3
1Retinal Disorders and Ophthalmic Genetics Division, Stein Eye Institute, University of California Los Angeles, David Geffen School of Medicine at UCLA, Los Angeles, California.
Specific spectral-domain optical coherence tomography features, including drusen growth and thinning of the outer nuclear layer, precede the development of type 3 macular neovascularization (MNV). Monitoring these signs aids in early detection and treatment of T3 MNV.
Area of Science:
- Ophthalmology
- Retinal Imaging
- Neovascularization
Background:
- Type 3 macular neovascularization (MNV) is a significant cause of vision loss.
- Understanding the precursor lesions of T3 MNV is crucial for timely intervention.
- Spectral-domain optical coherence tomography (SD-OCT) provides detailed cross-sectional imaging of the retina.
Purpose of the Study:
- To identify the specific imaging features that precede the development of type 3 macular neovascularization (T3 MNV).
- To investigate the role of soft drusen in the pathogenesis of T3 MNV using longitudinal SD-OCT data.
Main Methods:
- Analysis of SD-OCT scans from a cohort of eyes with T3 MNV and at least 12 months of prior imaging.
- Assessment of drusen characteristics (size, growth), outer retinal layer thickness, and presence of specific OCT biomarkers.
- Correlation of imaging findings with the onset of T3 MNV.
Main Results:
- T3 MNV most commonly developed above soft drusen (64.5% of cases).
- Progressive drusen growth and thinning of the outer nuclear layer/Henle fiber layer were observed preceding T3 MNV.
- Precursor features included external limiting membrane/ellipsoid zone disruption, retinal pigment epithelium changes, hyperreflective foci, and RPE/outer retinal atrophy.
Conclusions:
- Specific anatomical changes, including drusen growth and outer retinal thinning, precede T3 MNV.
- Identification of these SD-OCT features warrants close monitoring for T3 MNV.
- Early detection of T3 MNV enables prompt treatment with anti-VEGF therapy.
