“…Hormonal status seems to play a pathogenic role in the development of MO, but not of MA, which, as a matter of fact, represents the situation where the incidence of ischemic stroke is higher (Bousser, 2004). Inconsistent results have also been found for the various biologic or clinical markers of thrombotic risk studied so far (Crassard et al, 2001;Kern, 2004), such as platelet activation, factor V Leiden mutation (Soriani et al, 1998), von Willebrand factor (Tietjen et al, 2001), prothrombin factor 1.2 (Hering-Hanit et al, 2001), platelet leukocyte aggregation (Zeller et al, 2004), antiphospholipid antibodies (Cervera et al, 2002;Tietjen et al, 1998), and livedo reticularis (Tietjen et al, 2002).…”