The term transitional AV canal most commonly refers to the combination of an atrial septal defect (primum ASD), and a small restrictive inlet ventricular septal defect, which is often mostly occluded by accessory AV valve tissue. A single valvar annulus is usually present where the anterior and posterior bridging leaflets fuse overlying the ventricular septum.
Fetal Imaging Pearls
Fetal Surveillance
Prostaglandins (PGE)