Abnormal retinal vascular morphology Retinal shunt vessels 2025-03-01T11:10:50Z Retinal collateral vessels See Figure 12 of PMID:37238303. bnormal blood vessels in the retina that form as a response to vascular occlusion, serving as bypass channels to redirect blood flow around obstructed or damaged retinal vessels. Retinal shunt vessels are often associated with conditions like retinal vein occlusion or diabetic retinopathy and may appear as tortuous or dilated vessels on fundoscopic examination.