Successful carbon-ion radiotherapy for choroidal melanoma adjacent to the optic disc: A case report

Abstract

This report presents the case of a patient with choroidal melanoma adjacent to the optic disc, who was successfully treated with carbon-ion radiotherapy. A 44-yearold woman presented with a two-week history of blurred vision in her left eye. Before treatment, her best-corrected visual acuity was 1.2 and intraocular pressure (IOP) was 16 mmHg in the left eye. Funduscopic examination revealed a choroidal mass located nasally adjacent to the optic nerve. B-mode echography and magnetic resonance imaging (MRI) showed an intraocular mass, approximately 4 mm thick. The patient was diagnosed with choroidal melanoma and underwent carbon-ion radiotherapy with an irradiation dosage of 70 Gy. During the two-year follow-up, her best-corrected visual acuity was 1.0 and IOP was 15 mmHg in the left eye. Slitlamp examination showed no neovascularization in the iris. Funduscopic examination revealed cicatrization of the tumor. B-mode echography and MRI revealed slight decrease in the tumor thickness. Systemic computed tomographic imaging did not reveal any suspicious metastatic lesion.