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AN UPDATED STAGING SYSTEM OF TYPE 3 NEOVASCULARIZATION USING SPECTRAL DOMAIN OPTICAL COHERENCE TOMOGRAPHY

Su, Daniel MD; Lin, Shawn MD; Phasukkijwatana, Nopasak MD; Chen, Xuejing MD; Tan, Anna MD; Freund, K. Bailey MD; Sarraf, David MD

doi: 10.1097/IAE.0000000000001268
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Purpose: To comprehensively investigate spectral domain optical coherence tomography features associated with Type 3 neovascularization and determine the prevalence of each feature and to develop an updated staging system for Type 3 neovascularization based on spectral domain optical coherence tomography findings.

Methods: The authors retrospectively analyzed 34 eyes with new-onset Type 3 neovascularization. Spectral domain optical coherence tomography images at onset of Type 3 neovascularization, immediately after the first injection, and at the final quiescent visit were analyzed for the presence of specific optical coherence tomography features. In addition, when available, optical coherence tomography images from the visit before onset were studied.

Results: Among 18 eyes with preonset optical coherence tomography, 77.8% had preexisting intraretinal hyperreflective foci (precursor lesion). In the same group of eyes, 44.4% and 27.8% exhibited outer plexiform layer disruption and outer plexiform layer downward deflection, respectively. At the onset of detectable Type 3 neovascularization, all 34 eyes demonstrated a hyperreflective focus with cystoid macular edema and 85.3% exhibited disruption of the retinal pigment epithelium. Serous pigment epithelial detachment and subretinal fluid were present in 67.6% and 23.5% of eyes at onset, respectively. The rate of cystoid macular edema decreased from 100% to 17.6% after a single injection. At the final quiescent visit, focal atrophy at the site of Type 3 lesions, as evidenced by outer retinal and retinal pigment epithelium disruption developed in 88.2% and 52.9% of eyes, respectively.

Conclusion: An updated staging system of Type 3 lesions was developed based on spectral domain optical coherence tomography findings. A precursor stage consists of a punctate hyperreflective focus in the outer retina. The subtle detection of associated outer plexiform layer disruption and downward deflection may indicate that this precursor lesion is more likely to progress to an active Type 3 neovascular lesion. Stage 1 consists of a larger intraretinal hyperreflective lesion associated with cystoid macular edema but without outer retinal disruption. Stage 2 is notable for outer retinal disruption that occurs with retinal pigment epithelium disruption in most of the cases. Stage 3 is defined by an intraretinal hyperreflective lesion that extends through the retinal pigment epithelium to vascularize a drusenoid pigment epithelial detachment creating a serous component of the pigment epithelial detachment.

The authors retrospectively analyzed 34 eyes with Type 3 neovascularization using spectral domain optical coherence tomography. The presence of specific optical coherence tomography features and their prevalence were analyzed and used to develop an updated staging system for Type 3 lesions based on optical coherence tomography findings.

*Stein Eye Institute, University of California Los Angeles, Los Angeles, California;

Singapore Eye Center and Singapore Eye Research Institute, Singapore;

Vitreous Retina Macula Consultants of New York, New York, New York;

§LuEsther T. Mertz Retinal Research Center, Manhattan Eye, Ear and Throat Hospital, New York, New York;

Department of Ophthalmology, New York University School of Medicine, New York, New York;

**Greater Los Angeles Veteran's Administration Healthcare Center, Los Angeles, California; and

††Department of Ophthalmology, Kaiser Permanente, Woodland Hills, California.

Reprint requests: David Sarraf, MD, Retinal Disorders and Ophthalmic Genetics Division, Stein Eye Institute, UCLA Geffen School of Medicine, 100 Stein Plaza, Los Angeles, CA 90095; e-mail: dsarraf@ucla.edu

Supported by the Macula Foundation, Inc, New York, NY.

Presented at International Retinal Imaging Symposium (IRIS) IV, Stein and Doheny Eye Institute, Los Angeles, CA, March 19, 2016.

K. B. Freund is a consultant for Genentech, Optovue, Optos, Bayer Healthcare, and Heidelberg Engineering. D. Sarraf is a consultant for Genentech and Optovue and receives research funding from Allergan, Genentech, Optovue and Regeneron. The remaining authors have no conflicting interests to disclose.

© 2016 by Ophthalmic Communications Society, Inc.