Vitreous Metastasis in a Case of Metastatic Breast Cancer.

A 35-year-old female with a history of metastatic breast cancer (BC) presented with unilateral blurred vision and floaters over 6 weeks. Examination findings showed vitreous opacities and a vasculitis concerning for an infectious process. Diagnostic vitrectomy revealed no infectious cause, but rather metastatic cells in the vitreous, with no obvious retinal or choroidal metastatic focus. In this report we illustrate a case of vitreous metastasis in a patient with metastatic BC, highlighting the importance of recognizing this rare entity which can mimic an inflammatory or infectious process. Novel to this report is the use of modern wide-field retinal imaging, spectral-domain optical coherence tomography, and a surgical video to document the findings of this disease entity.