Clinical Report: Occult Macular Neovascularization Detected by OCTA

Overview

A 68-year-old African American male presented with bilateral blurry vision and was diagnosed with nonexudative occult macular neovascularization using multimodal imaging, including OCT and OCT angiography. This case highlights the importance of enhanced detection methods to monitor progression to exudative disease.

Background

Occult macular neovascularization refers to the presence of choroidal neovascular membranes that do not exhibit active exudation or leakage. These lesions can be challenging to detect with standard clinical examination alone. Multimodal imaging techniques such as optical coherence tomography (OCT) and OCT angiography (OCTA) provide detailed visualization of neovascular flow and structural changes. Early identification is critical to monitor for potential progression to exudative macular degeneration, which can threaten vision.

Data Highlights

Patient details and clinical findings:
Age: 68 years
Ethnicity: African American
Visual acuity: 20/20 OU
Intraocular pressure: 13 mm Hg OU
Slit lamp: Grade 1 nuclear sclerosis OU
Fundus exam: Bilateral posterior vitreous detachments with Weiss ring; mottled macula with small central drusen OS; multiple drusenoid pigment epithelial detachments and intermediate drusen OD; presence of "double-layer" sign indicating flat occult choroidal neovascular membrane.
Imaging: OCT and OCTA confirmed nonexudative occult macular neovascularization with increased flow in choriocapillaris slab.

Key Findings

• Patient presented with bilateral blurry vision but maintained 20/20 best-corrected visual acuity in both eyes.
• Slit lamp and fundus examination revealed early nuclear sclerosis and posterior vitreous detachments without signs of active exudation.
• Presence of multiple drusenoid pigment epithelial detachments and intermediate drusen, with a "double-layer" sign suggestive of occult choroidal neovascular membrane.
• OCT angiography detected increased flow consistent with a nonexudative occult macular neovascular membrane.
• Diagnosis of nonexudative macular neovascularization necessitates close monitoring for progression to exudative disease.
• Referral to retina specialist recommended for further evaluation and management.

Clinical Implications

Clinicians should consider multimodal imaging, especially OCTA, when subtle signs such as drusen and pigment epithelial detachments are present, even in patients with good visual acuity and minimal symptoms. Early detection of occult macular neovascularization allows for timely monitoring and intervention to prevent progression to vision-threatening exudative disease. Collaboration with retina specialists is essential for optimal patient management.

Conclusion

This case underscores the utility of OCT angiography in revealing occult macular neovascularization that may be missed on routine examination. Enhanced detection facilitates early diagnosis and vigilant monitoring to preserve visual function.

References

1. Rodman J, 2024 -- Optical Coherence Tomography Angiography Atlas: A Case Study Approach