Clinical manifestations and diagnosis of atrial septal ... - UpToDate
https://www.uptodate.com/contents/clinical-manifestations-and-diagnosis-of-atrial-septal-defects-in-adults
WebMay 31, 2022 · The septum secundum grows caudally and covers the ostium secundum. However, the septum secundum does not completely divide the atria, but leaves an oval orifice (the foramen ovale) that is covered but not sealed on the left side by the flexible flap of the septum primum ( figure 1 ).
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