Abstract
A case of choroidal metastasis treated with gamma-knife stereotactic radiosurgery is reported. A 54-year-old man with lung cancer was referred to our hospital for gamma-knife radiosurgery. His visual acuity in the left eye was impaired due to choroidal metastasis from lung carcinoma. MRI and fundus photography showed a choroidal mass located in the temporal portion of the posterior pole of the eye. A 15-Gy peripheral dose was administered by gamma-knife technique, at the 50% isodose line using an 8-mm collimator (3 shots). Complete immobilization of the eye was achieved with a orbicular muscle anesthetic block, anesthetic drops, and subsequent transconjunctival fixation of the four rectus muscles. During the 20-week follow-up, local tumor control was achieved, and his visual acuity remained unchanged. Gamma-knife radiosurgery is useful for choroidal metastasis. Immobilization of the eye is indispensable for this treatment.
