Outer Retina Segmentation Slab Vascularization in Macular Telangiectasia Type 2: Multimodal Imaging Characterization...

Area of Science:

• Ophthalmology
• Retinal Imaging
• Vascular Biology

Background:

• Type 2 Macular Telangiectasia (MacTel) is a degenerative retinal disease.
• Outer retina segmentation slab (ORSS) vascularization is a feature of MacTel.
• Differentiating true neovascularization from non-neovascular vascularization is crucial for management.

Purpose of the Study:

• To characterize ORSS vascularization in Type 2 MacTel using multimodal imaging.
• To develop a regression-derived scoring system (ORSS-V score) for differentiating neovascularization.
• To improve diagnostic accuracy and clinical management of MacTel.

Main Methods:

• Retrospective analysis of 150 eyes with Type 2 MacTel and analysable OCTA.
• Multimodal imaging analysis including OCT, FFA, and OCTA.
• Development and validation of a weighted composite score (ORSS-V score) using logistic regression and ROC analysis.

Main Results:

• ORSS vascularization found in 61.3% of eyes; 35.9% had subretinal neovascular membrane (SRNVM).
• Eyes with SRNVM were older and had worse visual acuity.
• The ORSS-V score showed excellent discriminative ability (AUC=0.91) with high sensitivity (88%) and specificity (86%) at a cut-off ≥6.

Conclusions:

• ORSS vascularization is prevalent in MacTel, frequently non-neovascular.
• A multimodal imaging approach with the ORSS-V scoring system reliably differentiates neovascularization.
• This tool enhances diagnostic accuracy and guides clinical decisions in MacTel management.