DELAYED ONSET Cutibacterium (FORMERLY Propionibacterium ) acnes ENDOPHTHALMITIS TRIGGERED BY INTRAVITREAL STEROID INJECTION.

PURPOSE:We report a case of delayed onset Cutibacterium acnes ( C. acnes , formerly Propionibacterium acnes or P. acnes ) endophthalmitis with the onset triggered by intravitreal steroid injection (triamcinolone acetonide) in a pseudophakic patient, 7 years after cataract surgery. METHODS/PATIENTS:A 67-year-old man presented with gradual worsening of vision, eye redness, and photosensitivity that started a month after intravitreal triamcinolone acetonide injection (Triescience, 4 mg/0.1 mL, Alcon Labs, Fort Worth, TX) for cystoid macular edema secondary to branch retinal vein occlusion in the right eye. The patient had undergone cataract surgery with intraocular lens in that eye 7 years prior. Examination showed the visual acuity of counting fingers at 3 feet and conjunctival injection, with 2+ anterior chamber cell and 2+ vitreous haze. Uveitis work up including angiotensin-converting enzyme, QuantiFERON Gold, and syphilis IgG screen was negative. Diagnostic pars plana vitrectomy with intravitreal injection of antibiotics was performed, and vitreous sample was sent for detailed laboratory analysis. RESULTS:Vitreous fluid analysis was positive for C. acnes and negative for viral, fungal, and malignant cells. Although the patient received intravitreal antibiotics injection twice, the intraocular infection and inflammation persisted which eventually required an intraocular lens and capsular bag removal, followed by insertion of a secondary intraocular lens later. CONCLUSION:Delayed onset C. acnes endophthalmitis may be triggered by an intravitreal steroid injection in pseudophakic patients.