Clinical Case Review of Bilateral Retinal Metastasis

Bilateral retinal metastasis is a rare disease that represents less than 1% of ocular metastases. Additionally, the prevalence of ocular metastases overall is only 5% to 10%. It is uncommonly found due to the absence of a lymphatic system in the eye. Ocular metastasis is spread hematogenously and the retina only receives 5% of blood flow, contributing to the rarity of this condition. Retinal metastasis has been reported to mimic symptoms of retinitis which include watery eye discharge, conjunctival injection and pain with ocular movement which leads to a harder diagnosis. Treatment options for retinal metastasis include systemic chemotherapy, intravitreal chemotherapy, and plaque radiotherapy. However, despite treatment, retinal metastasis often has a poor prognosis. This is a case of a 65-year-old woman with a history of breast carcinoma status post mastectomy who initially presented with metastatic infiltration of the lung and liver. However, she later developed an interesting case of retinal metastasis, which presented as symptoms of retinitis and indicated widespread dissemination of an unknown primary neoplasm.