“…52 A small study showed that an attachment area of less than a semicircle indicated that the retained placenta was more likely to pass spontaneously. 52 Another study postulated that delayed enhancement between the retained placenta and myometrium was thought to correspond to decidua basalis, and thus, if this was absent, then the etiology of the retained placenta was accreta. 53 A recent study showed that, in postembolization patients, decreased placental enhancement in the early postcontrast phase correlated with faster resorption.…”