Covid-19 vaccine associated cerebral venous thrombosis (CVT) are rare adverse events and can be considered as black swan events."Black swan events", originally described by Nassim N. Taleb in economic theory, are rare, unexpected events whose potential to occur only becomes apparent after they have happened, where they are neither predicted nor anticipated, and only on retrospect, a clear basis is found for their occurrence that justifies their apparent randomness. The modified Adenovirus vector Covid-19 vaccines (ChAdOx1 nCoV-19 (Oxford-AstraZeneca) and Ad26.COV2.S (Johnson & Johnson/Janssen)) and mRNA based Covid-19 vaccines (BNT162b2 mRNA CORRESPONDENCE E357 CORRESPONDENCE E359

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