Abstract :Atrial septal aneurysm is defined as area of excessive mobility of interatrial septum at least 10mm
in width and moving away from the normal plane of the septum by at least 10 mm. Nearly 75% of
patients with atrial septal aneurysm have a patent foramen ovale. Usually there is no or minimal left
to right shunt due to higher pressure of left atrium. In conditions with raised right atrial pressure,
right to left shunt may occur. Atrial septal aneurysm with patent foramen ovale is associated with
higher incidence of cryptogenic stroke and migraine with aura. It is not clear if patent foramen ovale
is responsible for these comorbidities. Atrial septal aneurysm is also associated with higher incidence
of mild to moderate mitral and aortic valve regurgitation and supraventricular arrhythmias.