Purpose: To describe a rare presentation of familial choroidal osteoma in two siblings.
Methods: The clinical findings in two siblings over 4 years' follow-up.
Results: Two brothers (15 and 12 years old) had bilateral choroidal osteomas. Both had bilateral peripapillary yellowish-white lesions and midperipheral mottling pigment appearance, which are not seen in sporadic cases. Extensive midperipheral area with mottling pigment appearance was noted by fluorescein angiography (FA) as scattered multiple hyperfluorescent dots. The yellowish-white lesions showed diffuse hyperfluorescence with FA and hypofluorescence with indocyanine green angiography (ICG). ICG also revealed irregular hyperfluorescent areas within the tumor, indicating abnormal choroidal vessels on the tumor. In the left eye of the younger brother, the subretinal fibrosis due to choroidal neovascularization superior to the macula extended down toward the foveal region over 2 years, resulting in visual deterioration.
Conclusion: The midperipheral mottling pigment appearance of familial choroidal osteoma cases is unique and different from most sporadic cases, suggesting that familial choroidal osteoma might have separate etiologic or modified factors.
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