Abstract
Purpose
To determine the prevalence of vitreous cysts in patients with retinitis pigmentosa (RP).
Methods
We retrospectively reviewed the charts of 435 consecutive patients diagnosed as having typical RP.
Results
Vitreous cysts were diagnosed in 37 eyes of 28 patients with RP (13 males and 15 females; mean age 47.0 ± 19.8 years; range 15–79 years), for an overall prevalence of 6.4 %. The cysts were observed bilaterally in nine of the patients (32.1 %). Among these 28 patients, 11 (39.3 %) were younger than 40 years. In all, 81.8 % of the vitreous cysts were detected around the optic nerve head.
Conclusions
We demonstrated that the prevalence of vitreous cysts was 6.4 % in patients with RP. These cysts were considered to be asymptomatic.

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Acknowledgments
This work was supported in part by Grants-in-Aid (to Y.I. and T.I.) from the Japanese Ministry of Education, Culture, Sports, Science, and Technology (nos. 24659763 and 24659764).
Conflicts of interest
N. Yoshida, None; Y. Ikeda, None; Y. Murakami, None; S. Nakatake, None; T. Tachibana, None; S. Notomi, None; T. Hisatomi, None; T. Ishibashi, None.
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Yoshida, N., Ikeda, Y., Murakami, Y. et al. Vitreous cysts in patients with retinitis pigmentosa. Jpn J Ophthalmol 59, 373–377 (2015). https://doi.org/10.1007/s10384-015-0405-1
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DOI: https://doi.org/10.1007/s10384-015-0405-1