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(A) Normal atrial septum which results from the fusion of septum primum and septum secundum. (B) Failure of fusion of septum primum and septum secundum, leading to patent foramen ovale. (C) Right atrial septal pouch, resulting from malformation of atrial septum forming a blind-end socket. (D) Atrial septal aneurysm, the result of a hypermobile atrial septum. (Design and courtesy of Mr. Fotis G. Ioannidis).
