Plaque radiotherapy or brachytherapy is one of the most common treatment modalities for the treatment of ocular melanomas. Brachytherapy is a type of radiation therapy in which seeds, ribbons, or capsules that contain a radiation source are placed in the body, in or near the tumor. It is often used to treat cancers of the head and neck, breast, cervix, prostate, and eye.
In the case of ocular melanomas, the radioactive seeds are embedded in a saucer-shaped disc/plaque, which has an inner, concave radioactive surface and an outer, convex protective shield. Every radioactive plaque is custom made to the dimensions (e.g thickness and diameter) of each tumor.
The plaque radiotherapy treatment involves: