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We performed histopathologic and immunofluorescence studies of autopsy eyes from a 73-year-old woman with autosomal dominant retinitis pigmentosa from a family with reduced penetrance. Light microscopic examination showed extensive photoreceptor loss in most regions. In the temporal midperiphery of the retina, there were patches of remaining photoreceptors, some arranged in rosettes. Electron microscopic examination showed that these rosettes were composed mostly of rods, with a few cone-like inner segments. The malformed photoreceptor elements in the rosette lumens stained positively with anti-rhodopsin, but not with anti-red- and green-cone opsin or anti-blue-cone opsin. To our knowledge, this is the first report of photoreceptor rosettes containing rod photoreceptors in a case of retinitis pigmentosa. Future studies of additional patients will be needed to determine if the rod-abundant rosettes seen in our patient are a characteristic finding of autosomal dominant retinitis pigmentosa with reduced penetrance.

Photoreceptor Rosettes in Autosomal Dominant Retinitis Pigmentosa With Reduced Penetrance