“…Indeed, in the presence of a velamentous y insertion of the cord associated with a placenta praevia, the incidence of vasa praevia is estimated at 1/50 (Hasegawa et al, 2011;Nishtar and Wood, 2012). Moreover, in many authors, in vitro fertilization (IVF) would be a risk factor, since it multiplies the risk by ten (Baulies et al, 2007;Chmait et al, 2010;Cipriano et al, 2010;Gagnon et al, 2010;Hasegawa et al, 2011;Nishtar and Wood, 2012). Of these, it would be desirable to carry out systematic screening in patients with risk factors.…”