What classic fundoscopic finding is indicative of Central Retinal Vein occlusion?

The classic fundoscopic finding indicative of Central Retinal Vein Occlusion (CRVO) is the "blood and thunder retina." This term describes the appearance observed on fundoscopic examination, where there are widespread, diffuse retinal hemorrhages and edema. The name conveys the dramatic appearance of the retina, resembling a stormy sky, with the presence of "blood" (hemorrhages) contrasting against the background retinal tissue. In CRVO, the obstruction of the central retinal vein leads to a backup of blood, causing hemorrhages in multiple areas of the retina, essentially flooding the retinal layers with blood.

Understanding this concept also emphasizes the severity of CRVO; it is a critical condition that can lead to vision loss if not managed properly. The other choices — retinal pallor, cherry red spot, and box carrying — denote different retinal conditions or findings that are not specifically associated with CRVO, which reinforces the distinctiveness of the "blood and thunder" appearance in this scenario.