66 year-old female presents for routine exam to monitor for tumor recurrence 20 months after brachytherapy
Choroidal melanoma OS s/p plaque brachytherapy
Choroidal nevus OD
Tumor has been decreasing in size on ultrasound
Last liver CT four months ago without evidence of metastatic disease
Reports occasional flashes in both eyes and slow decrease in vision OS
VA 20/25; 20/100
Pupils RR OU, no RAPD
IOP 18; 14
EOM full OU
SLE unremarkable OU
Central retinal vein occlusion
Branch retinal vein occlusion
Exposure to radiation causes preferential loss of endothelial cells in the vasculature with sparing of pericytes. Irradiation causes direct endothelial cell damage as well as damage from free radicals created by radiation-related damage to red blood cells and iron.
Retinal microaneurysms (more prevalent in other vasculopathies, including diabetes mellitus)
Retinal hard exudates
Tractional retinal detachment
Grid macular laser photocoagulation
Sector scatter and pan-retinal photocoagulation to areas of retinal non-perfusion
Photodynamic therapy, hyperbaric oxygen
Primary Prevention: Ways to decrease radiation dose or to treat before an issue is found
Shielding during external beam radiation
Hyperfractionationed external beam radiation
Prophylactic periocular triamcinolone
Prophylactic laser photocoagulation
Prophylactic anti-VEGF therapy
Prognosis and Future Directions
Radiation retinopathy and neuropathy is the leading cause of permanent and severe vision loss after radiation
Onset of symptoms start from six months to three years (reported from one month to 15 years)
Radiation maculopathy risk factors:
45 Gy dose for plaque brachytherapy, 15 Gy for external beam
Recent studies on OCT angiography as an new sensitive imaging modality for radiation retinopathy
Therapy is multimodal with anti-VEGF and intravitreal steroid injections. Some centers are using these modalities as prophylactic therapy with promising results.
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Jesse Berry, MD, Assistant Professor of Clinical Ophthalmology and Associate Director of Ocular Oncology, firstname.lastname@example.org