Rituximab-induced cystoid macular edema in a patient with systemic lupus erythematosus: A case report and literature review

Cystoid macular edema (CME) is considered a rare adverse effect of rituximab use, with only a limited number of cases published in the literature. Although its etiopathogenesis is still unknown, its mechanism seems to be related to a transient elevation of cytokines after rituximab infusion resulting in an increased permeability of retinal vessels. We report the first case of rituximab-induced CME in a patient with systemic lupus erythematosus (SLE), where rituximab was used to treat hematological complications. A month after the 2nd infusion, the patient developed blurred vision and decreased visual acuity in the right eye. An optic coherence tomography (OCT) was performed, being diagnosed with CME. Rituximab was then discontinued, exhibiting a complete resolution of the condition within 4 weeks. The aim of our work is to report the first case in a patient with SLE and also carry out a brief review of the subject comparing it to all previously published cases.