Atrial septal dilatation

What it means

A bulging of the interatrial septum towards one side. In adults, atrial septal aneurysm can be defined as a protrusion of the aneurysm of >10 mm beyond the plane of the atrial septum as measured by transesophageal echocardiography.

Atrial septal aneurysm formation may be secondary to raised interatrial pressure gradients, producing a bulging septal shift toward the low-pressure side. However, it has been also found in patients with normal atrial pressures, suggesting a primary (congenital) malformation.

Rare diseases that can present with this3

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Atrial septal aneurysm