Choroidal neovascularization secondary to choroidal osteoma: successful treatment with photodynamic therapy

Sir,

The term choroidal osteoma was coined by Gass in 1978 when he described four healthy young women with characteristic ophthalmoscopic findings of slightly elevated, yellowish, juxtapapillary, choroidal tumour with sharp geographic borders.² These tumors demonstrate evidence of bone formation in the choroid and are believed to be choristomatous in origin.³ The majority of patients with choroidal osteoma maintain good vision. However, there is increasing probability of loss of vision with increasing duration of follow-up. In a follow-up study of 36 patients, the probability of loss of visual acuity (6/60 or worse) was more than 50% by 10 years.⁴ Choroidal neovascularization is the most frequent cause of visual loss in choroidal osteoma with more than half of the patients expected to develop choroidal neovascularization.^{4, 5}

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