An earlier article by the health editor conflates #placentaAccreta - stuck down, grown deep - with #placentaPraevia - grown across the internal opening of the #cervix and thus going to be torn in labour.
#Praevia is looked for, and low-lying placenta is a reason to call women back for one or several further looks to make sure it isn't across that #os

If it is, that's an indication for #CaesareanSection before onset of #labour

This is difficult stuff, and needs careful writing.