Cerebral Venous Sinus Thrombosis After a Third Dose of mRNA COVID-19 Vaccine in an Adolescent: A case report

Abstract

Abstract Background: Several effective vaccines against Coronavirus disease 2019 (COVID-19) have been developed to control the spread of the disease. A few cases of thrombosis have been reported post-vaccination, especially among young adult women immunized with viral vector-based vaccines; although pediatric cases of cerebral venous sinus thrombosis (CVST) have been rarely reported after messenger ribonucleic acid (mRNA) vaccine administration. Case presentation: Here, we report a case of CVST in a 14-year-old girl immunized with the BNT16B2b2 vaccine. Other than this recent COVID-19 vaccination, there were no precipitant risk factors in her medical history. Laboratory work-up showed low levels of protein S activity. Further research revealed no pathological gene mutation. She was treated with anticoagulant therapy and discharged with mildly impaired coordination/movement of the fingers. Conclusion: CVST may occur following a mRNA COVID-19 vaccination, even among children. Further investigations are needed to establish whether thrombotic events are merely incidental or are a complication associated with mRNA-based vaccines.