A 45-year-old man with type 2 diabetes mellitus (HbA1c 9.2%) presents with sudden blurring of vision in the right eye over 3 days. Dilated fundus examination reveals the findings shown in the diagram. The structure marked **B** (Neovascularization Elsewhere) is noted on the temporal retina, with associated preretinal hemorrhage. Which of the following complications is this patient at HIGHEST risk of developing in the immediate future?

Explanation

## Why "Vitreous hemorrhage and tractional retinal detachment" is right Neovascularization Elsewhere (NVE) — marked as **B** in the diagram — represents the proliferative stage of diabetic retinopathy. These fragile new vessels grow into the vitreous cavity and are prone to bleeding, causing sudden visual loss (vitreous hemorrhage). The associated preretinal hemorrhage seen here indicates active neovascular activity. As these vessels contract and scar, they exert traction on the retina, leading to tractional retinal detachment (TRD). Both vitreous hemorrhage and TRD are the defining blinding complications of PDR and occur in direct consequence of NVE. Per AK Khurana 7e and AAO PPP, NVE is a high-risk feature of PDR requiring urgent intervention (PRP or anti-VEGF) precisely because of this risk. ## Why each distractor is wrong - **Permanent loss of central vision from macular ischemia**: While diabetic retinopathy does cause macular ischemia, this is a chronic process associated with non-proliferative disease and DME. NVE itself does not directly cause macular ischemia; the immediate threat from NVE is hemorrhage and traction, not ischemia. - **Neovascular glaucoma with acute angle closure**: Neovascular glaucoma (rubeosis iridis with angle neovascularization) is a serious complication of PDR, but it develops over weeks to months as a consequence of ischemia-driven VEGF release. It is not the immediate risk from NVE; vitreous hemorrhage and TRD occur acutely. - **Spontaneous regression of neovascularization with visual recovery**: Neovascularization does not regress spontaneously. Without treatment (PRP or anti-VEGF), NVE progresses, bleeds, and causes retinal detachment. This option represents a fundamental misunderstanding of PDR natural history. **High-Yield:** NVE = fragile new vessels in vitreous → vitreous hemorrhage + tractional retinal detachment = blinding complications of PDR requiring urgent PRP or anti-VEGF. [cite: AK Khurana 7e; AAO PPP]