Idiopathic enlargement of the right atrium.

A case of aneurysmal enlargement of the right atrium was found accidentally during a routine examination. The patient was asymptomatic and free of palpitations or proven rhythm disturbances. The results of echocardiography, magnetic resonance imaging, and cardiac catheterization excluded cardiac malformation, which could have caused secondary enlargement of the right atrium. A partial pericardial defect as a likely cause of herniation of the right atrium was ruled out by magnetic resonance imaging. In keeping with these results, isolated aneurysmal enlargement of the right atrium was diagnosed.

Lipomatous hypertrophy of the interatrial septum: diagnosis by echocardiography and magnetic resonance imaging. A case report.

Lipomatous hypertrophy of the interatrial septum is generally a benign abnormality characterized by deposition of adipose tissue in the interatrial septum, usually extending to the atrial wall and interventricular septum. It is most often detected as an incidental echocardiographic finding. Transesophageal echocardiography can provide additional details, but in this case magnetic resonance imaging proved superior to it in assessing the involvement of other cardiac structures.