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The flap of the foramen ovale is termed the “fossa ovalis” and is formed by the septum secundum, septum primum (which attaches on the left atrial [LA] side of the septum secundum), and the AV canal septum. 15 The septum primum becomes contiguous with the systemic venous tributaries to form the inflow of the superior and inferior vena cavae.
Cross-sectional view of the atrial septum showing the tunnel of the PFO (red arrow) passing between the infoding (triangle) of the right atrial wall (septum secundum) and the flap valve of the fossa (septum primum) in the antero-superior part of fossa ovalis.
1 lut 2011 · Key Points. Patent foramen ovale (PFO) is a normal fetal communication between the right and left atria that persists postpartum. PFOs are present in 20–34% of the population, but they pose...
21 sty 2016 · Atrial septal aneurysm (ASA) is a focal outpouching of the redundant interatrial septum of at least 10 mm from the midline position with a base of at least 10 mm (Refs 55,173). The dashed...
21 cze 2024 · Septum primum defects are likely better referred to as atrio-ventricular septal defects as they are commonly associated with abnormalities of the atrio-ventricular valves, atrio-ventricular conduction and left ventricular outflow tract. These are most seen in patients with Downs’ syndrome.
31 maj 2022 · Atrial septal defect (ASD) is the most common congenital heart lesion in adults and is often asymptomatic until adulthood. Diagnosis is important, as timely ASD repair improves outcomes. (See "Management of atrial septal defects in adults" .)
ASA is redundant septal primum tissue with excessive mobility of the fossa ovalis. ASA is defined as excursion of greater than 10 mm into either the LA or RA or a total excursion of 15 mm in septal motion.
