Intracerebral de novo arterio-venous malformations as a side effect of bevacizumab

IntroductionBevacizumab is a monoclonal antibody for the vascular endothelial growth factor receptor and is utilized in the treatment of various tumors. Gastrointestinal perforation/fistula, heart failure, hemorrhage, hypertension, proteinuria/nephrotic syndrome, thromboembolism, posterior reversible encephalopathy syndrome, and necrotizing fasciitis are serious side effects of bevacizumab. Bevacizumab associated de novo brain arterio-venous malformation formation has not been documented in the literature.Case reportHere, we presented a 35-year-old female patient with recurrent high-grade glial tumor who developed multiple supra- and infratentorial de novo arterio-venous malformations after receiving the last dose of bevacizumab.Management & OutcomeIntervention options for the adverse effect were limited. In fact, there was no chance of intervention because the patient died for another reason.DiscussionBased on this experience, it can be hypothesized that bevacizumab may induce de novo arterio-venous malformations in the brain as a result of arterial and venous thrombotic effects. Additional studies should be done to clarify the causal relationship between bevacizumab and arterio-venous malformations in primary brain tumors.