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—We wish to thank Dr Gartner for bringing up the incidence of drusen of the optic nerve and his discussion of such a case in two previous publications. Our case report was not intended to shed light on the incidence of drusen of the optic nerve but rather to show that the unusual mulberry lesions seen on or around the optic disc are not astrocytomas, but rather calcified drusen. We are aware of the excellent work of Friedman et al and Gartner and Henkind. However, their articles do not describe the clinical appearance of optic nervehead drusen in a patient with retinitis pigmentosa, nor do they correlate their pathologic changes with clinical appearance. As such, both articles do not shed light on the nature of the mulberry lesions of the optic nerve in retinitis pigmentosa. As a result, we can only make reference to the clinicopathologic correlative case
Tso MO, Fishman GA. Drusen-Reply. Arch Ophthalmol. 1985;103(9):1283. doi:10.1001/archopht.1985.01050090035021
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