Transcatheter Closure of a Patent Foramen Ovale With a Small Adjacent Atrial Septal Defect and a Double Interatrial Septum Post Cryptogenic Stroke.

The phenomenon of double interatrial septum (DIAS) represents a particularly rare subtype of atrial septal malformation, characterized by the presence of dual membranes separating the atria, resulting in a distinctive interatrial space. This unique anatomical structure has been linked to a paradoxical right-to-left shunt, potentially contributing to embolic ischemic strokes. Within this context, we report a rare case of a 34-year-old female who presented with a transient ischemic attack (TIA) and was diagnosed with patent foramen ovale (PFO) and a small adjacent atrial septal defect (ASD), along with the presence of a DIAS. The diagnosis was confirmed wit transoesophageal echocardiography and cardiac magnetic resonance imaging (MRI), and the condition was successfully treated with a transcatheter occluder device.