An atrial septal defect is commonly due to the failure of the foramen magnum to close at birth.

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The foramen magnum is a hole in the base of the skull that allows the spinal cord to connect with the brain. It is not related to the development of atrial septal defects, which occur when there is a hole in the wall that separates the two upper chambers (atria) of the heart. Atrial septal defects are usually present at birth, but the cause is not related to the foramen magnum.

An Atrial Septal Defect Is Commonly Due to the Failure