Abstract
BACKGROUND: This case report aims to describe the diagnostic method and the clinical course of endophthalmitis caused by Enterococcus faecalis. CASE PRESENTATION: A 66-year-old man presented with sudden, severe pain and acute vision loss in his left eye. Ocular examination revealed significant intraocular inflammation and dense vitritis, suggesting endogenous endophthalmitis. Systemic evaluation identified colonic diverticulosis as a potential source of infection. Pars plana vitrectomy was performed, and analysis of the vitreous fluid, including cytological and bacteriological studies, confirmed the presence of Enterococcus faecalis. CONCLUSION: The vitreous fluid is an adequate sample for characterizing endophthalmitis by combining cytological and bacteriological analyses.