During the routine cut-up of an enucleation specimen for suspected posterior pole uveal melanoma, from a male adult aged 60 years old, some well-defined, white patches were noticed in the vicinity of the antero-inferior choroid / retina. The axial length of the eyeball was 24mm.
Figure 1 is a macro photo of these white patches.
Figure 2 is a low power micro of one of these white patches. The white patch lies between the 2 arrows.
Figure 3 is a higher power of the white patch.
1. What is the likeliest explanation for these white patches?
2. What do figures 2 and 3 show?
1. This is a nice example of confluent ‘paving stone’ or ‘cobblestone’ degeneration.
2. Retinochoroidal adhesion, neural retinal atrophy, gliosis and loss of photoreceptors. Intact Bruch’s (not readily apparent on this H and E), choroidal atrophy with loss of the choriocapillaris and absent RPE.
For a good summary of cobblestone degeneration, see Yanoff and Fine’s Ocular Pathology p401; Bill Lee’s book-p228.
Some quick facts about cobblestone degeneration:
• Degenerative process-increase with age and with axial length of eye (hence commoner in myopic eyes).
• Often bilateral
• Present in 25% of autopsy cases.
• Located between the ora serrata and equator and separated from ora by normal retina.
• Commonly located in infero-temporal quadrant.