“…VTE is a multicausal disease with many interactions between diff erent acquired (immobilization, surgery, trauma, cancer, autoimmune disorders, pregnancy, oral contraceptive use, long distance airplane fl ight, etc.) and inherited prothrombotic factors (FV Leiden and FII 20210A mutations, defi ciencies of protein C, S and antithrombin, and elevations of procoagulant factors) 8 . Although it is in general a frequent disease, VTE is rare among young people; the incidence of VTE is less than 5 fi rst-time VTE per 100,000 per year among people younger than 15 years but increases sharply to 450-600 per 100,000 per year among people aged 80 years or older 1,3,5,8 .…”