Final answer:
The association percentage between PFO and ASA is not provided in the reference material. Up to 20-25 percent of the general population may have a benign, asymptomatic PFO, but specific data on PFO-ASA comorbidity would be required for an accurate percentage.
Step-by-step explanation:
In the context of congenital heart defects, specifically when discussing a patent foramen ovale (PFO), it's important to note that PFO can be associated with an atrial septal aneurysm (ASA). A PFO occurs when the foramen ovale fails to close at birth, potentially resulting in an open passageway between the left and right atria. While up to 20-25 percent of the general population may have a PFO, most cases are benign and asymptomatic, and therein lies the difficulty in quantifying its association with ASA without specific epidemiological data.
However, the question seems to be asking for a percentage association between PFO and ASA, but such statistical information is not provided in the reference material provided. Therefore, to get an accurate percentage, one would need to consult current medical research or a database with specific clinical data on the co-occurrence of these two conditions.