Figure 9. Leaflet valve. Posterior surface of a Surgitek 22000 series round standard double-lumen implant (placed 1983), with the characteristic small white 3-mm dot (thin arrow) with a slit, proximally marking one end of the fill channel. The rectangular leaflet valve, measuring about 10 x 60 mm, is seen here extending to the left (thick arrow). Rarely seen MR images capturing the appearance of this type of leaflet valve are shown in Figures 10 and 11.