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These are highly prothrombotic, immunological disorders characterised by specific clinical and pathological criteria which include thrombocytopenia and thrombosis. While they are predominantly triggered by heparin and the adenoviral vector vaccines, respectively, other provoking factors have been described, as well as spontaneous forms. The unexplained co\u2010occurrence of thrombocytopenia with thrombosis should raise suspicion and prompt testing. 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