The post-temporal fossa is small and directed anteromedially.
However, the homology between the dinosaurian structure and the mammalian fossa subarcuata is doubtful.
Subjects with interatrial communication: 55 patients with an interatrial communication were studied (48 within the oval fossa; 7 of sinusvenosus type).
There was a 5 mm atrial defect in the oval fossa with left to right flow noted.
Echocardiography showed normal chamber and vessel relationships, a small patent arterial duct, and an atrial septal defect with bidirectional shunting across the oval fossa.
There was a right-to-left shunt through an atrial septal defect within the oval fossa and a left-to-right shunt through a patent arterial duct.
Our case had a large perimembranous ventricular septal defect, an atrial septal defect within the oval fossa, and pulmonary valvar stenosis.
When considering the technical aspects of percutaneous closure of defects within the oval fossa, we should not forget the natural history of this malformation.
