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Correspondence
July 1999

All Prepapillary Arterial Loops Are Not Alike

Arch Ophthalmol. 1999;117(7):978-979. doi:

The development of cilioretinal arterial collaterals on the disc after central retinal artery occlusion was described by Marmor et al1 in 1985. This rare occurrence has been reported by others and was recently featured in a "Photo Essay"2 in the ARCHIVES. The recent report3 of acquired prepapillary arterial loops after central artery occlusion in the October 1998 ARCHIVES is an example of the same phenomenon. In Figure 2, the unusual vessels appear to originate from the ciliary circulation and exit at the edge of the disc to connect to the retinal arterial tree. These collaterals should not be confused with prepapillary arterial loops.

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