A premature infant born at 29 weeks gestation is screened for ROP. Fundus examination reveals the border between vascular and avascular retina in zone III with no plus disease. This corresponds to:

• A Aggressive ROP (A-ROP)
• B Stage 2 ROP, zone III, no plus
• C Normal immature vascularization, not yet ROP
• D Stage 1 ROP, zone III, no plus ✓

Explanation

The description mentions a border between vascular and avascular retina, which is the demarcation line of stage 1 ROP. Stage 1 ROP is defined by the presence of a flat white demarcation line at the junction of vascular and avascular retina. Zone III is the most peripheral temporal zone. Without plus disease or a ridge, this is stage 1. Normal immature vascularization does not produce a sharp demarcation line. D-ROP is aggressive posterior disease with plus disease in zone I or posterior zone II.

Reference: International Classification of Retinopathy of Prematurity, Revised 2005 ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.