Despite the benign follow-up in our cases, the unexpected presence of an extremely redundant atrial septum, leads to a close prenatal attention particularly in the presence of rhythm disturbance. The pathologic substrate of this anomaly might be an intrinsic alteration of the myocardial structure of the septum like seems demonstrated in the aneurysm circumscribed to area of the fossa ovalis [correction of fosa ovale]. The increase in the left atrial pressure after birth will produce a normal 2-D echo patterns in the newborn period.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/7644807