Atrium Septal Pouch: An Anatomic Variant of the Interatrial Septum.

• SP originates by partial fusion of the septum primum and septum secundum. • SP may be a site of thrombus formation. • SP may predispose to thromboembolic events.

Accessory Mitral Valve Tissue: An Unusual Echocardiographic Finding.

• AMVT is a rare congenital cardiac malformation. • AMVT can be an incidental finding. • Endocarditis and embolic events are known complications.