A case of intraventricular septum dissection presenting with aneurysmal dilatation through the outflow track of the left ventricle.

A dissecting aneurysm of the intraventricular septum is an extremely rare entity. Most of these aneurysms originate from the right sinus of Valsalva and are believed to result from rupture of a Valsalva sinus aneurysm. Such cases may present with aortic insufficiency, rhythm disorders, ventriculo-septal ischemia and infectious endocarditis. In this article, we present a patient who underwent surgical intervention with a diagnosis of intraventricular septal cyst (hydatid cyst) leading to both a flow gradient through the left ventricle outflow track and dysrhythmia, without any evident dilatation or aneurysm of the sinus of Valsalva.