Figure 12. Leaflet valve. Posterior surface of a Dow Corning 380 series standard double-lumen implant (placed 1985), showing the most common configuration for the leaflet valve for this series (thick arrow). Just barely visible on this implant itself (but not in this photograph) were the markings "SILASTIC II 300 cc" on the round inner-lumen back patch (thin arrow). The xeromammographic appearance of this implant is shown in Figure 13, and the characteristic MR imaging appearance of this type of leaflet valve is shown in Figure 14.