Characterizing right-angled vessel in macular telangiectasia type 2 with structural optical coherence tomography

Area of Science:

• Ophthalmology
• Retinal Imaging
• Medical Diagnostics

Background:

• Macular telangiectasia (MacTel) type 2 is a degenerative retinal disease.
• Right-angled vessels (RAV) are a recognized clinical sign in MacTel.
• Understanding the structural correlates of RAV is crucial for disease staging.

Purpose of the Study:

• To investigate spectral-domain optical coherence tomography (SD-OCT) findings associated with right-angled vessels (RAV) in Korean patients with MacTel type 2, severity 3.
• To identify factors associated with the presence of RAV in this cohort.

Main Methods:

• Retrospective, multicenter, cross-sectional study of 116 eyes with MacTel type 2, severity 3.
• Comparison of SD-OCT findings between eyes with and without RAV (identified via fundus photography or fluorescein angiography).
• Logistic regression analysis to determine factors associated with RAV presence.

Main Results:

• Fifty eyes had RAV, and 61 did not.
• Eyes with RAV showed significantly more inner retinal (IR) disorganization, outer retinal (OR) cavities, and ellipsoid zone (EZ) disruption on SD-OCT compared to eyes without RAV (P < 0.001).
• Eyes without RAV more frequently presented with only IR cavities (P < 0.001).

Conclusions:

• The presence of RAV in MacTel type 2, severity 3, is strongly associated with specific SD-OCT findings, including IR disorganization, OR cavities, and EZ disruption.
• These SD-OCT findings suggest that RAV may indicate an advanced stage of Macular Telangiectasia type 2.