Chronic macular edema associated with extrafoveal vitreoretinal traction

Area of Science:

• Ophthalmology
• Retinal Diseases
• Medical Imaging

Background:

• Chronic macular edema, including diffuse (DiME) and cystoid (CME), can be challenging to treat.
• Extrafoveal vitreoretinal traction is a potential, yet under-recognized, cause of persistent macular edema.

Purpose of the Study:

• To investigate the association between extrafoveal vitreoretinal traction and chronic macular edema using optical coherence tomography (OCT).

Main Methods:

• Analysis of OCT findings in two patients with persistent DiME or CME linked to extrafoveal vitreous traction membranes.
• Exclusion of eyes with other vitreoretinopathies or prior treatments (vitrectomy, intravitreal medications).
• Comparison with an age-matched normal control group (n=12) for macular thickness quantification.

Main Results:

• Two cases identified: one post-ocular injury, one idiopathic, both with treatment-refractory chronic macular edema and extrafoveal vitreoretinal traction.
• Retinal edema at the traction site was continuous with central macular edema, presenting as diffuse macular edema.
• OCT, particularly with specific programs (6-radial lines, Line group), detected extrafoveal traction sites.

Conclusions:

• Extrafoveal vitreoretinal traction is a potential cause of chronic diffuse macular edema.
• Diverse OCT programs are crucial for detecting these often-overlooked traction sites.
• Further research with larger cohorts is needed to compare early vitrectomy or pharmacologic vitreolysis with current treatments.