Cytomegalovirus Retinitis Associated With Intravitreal Dexamethasone Implant Injection.

To describe an immunocompetent patient with cytomegalovirus (CMV) retinitis after dexamethasone implant injection and review previously documented cases. A review of case reports and literature was performed. A 75-year-old man presented with acute decreased vision in the left eye. He had a vitrectomy and membrane peeling for an epiretinal membrane with recurrent cystoid macular edema and was receiving intravitreal dexamethasone implant injections at an outside hospital. The visual acuity in the left eye was hand motions, and an examination found patchy retinal whitening with hemorrhages. Aqueous polymerase chain reaction was positive for CMV. The laboratory evaluation was negative for immunodeficiencies. He was treated successfully with intravitreal and oral antivirals; however, his vision remained poor at most recent follow-up. A literature review found 8 previous cases of CMV retinitis after dexamethasone implant injection, although most had underlying immune dysregulation. CMV retinitis after intravitreal dexamethasone implant injection is rare. Awareness of this complication is essential because of the risk for devastating blindness.