Cohen1 reported a case of acquired prepapillary arterial loops as a consequence of a central retinal artery obstruction. Such acquired loops, however, have been described before and their pathogenesis is well understood.2-5
Parsa CF, Hoyt WF. All Prepapillary Arterial Loops Are Not Alike. Arch Ophthalmol. 1999;117(7):978–979. doi:
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