In the ETDRS classification of diabetic retinopathy, the criterion that distinguishes severe NPDR from moderate NPDR (the 4-2-1 rule) includes all of the following EXCEPT:

• A Neovascularization elsewhere (NVE) covering >1/4 disc area ✓
• B Intraretinal microvascular abnormalities (IRMA) in 2 or more quadrants
• C Dot and blot hemorrhages in all 4 quadrants
• D Venous beading in 2 or more quadrants

Explanation

The 4-2-1 rule for severe NPDR requires: hemorrhages/microaneurysms in all 4 quadrants, venous beading in 2+ quadrants, or IRMA in 1+ quadrant (any single criterion suffices). Neovascularization elsewhere (NVE) is a feature of proliferative diabetic retinopathy, not NPDR. The presence of any new vessels marks the transition from NPDR to PDR.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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