Table 1.

Classification of structural abnormalities of the left ventricular outflow

A	Aneurysmal lesions
1	Aneurysm of the membranous part of the interventricular septum
2	Prolapse of the anterior leaflet of the mitral valve
3	Aneurysm of the anterior leaflet of the mitral valve
4	Aneurysm of the mitral aortic intervalvular fibrosa
5	Unsupported sinus and aortic cusp prolapse
6	Contained aortic root rupture/left ventricular outflow pseudoaneurysm
B	Obstructive lesions
1	Hypertrophic obstructive cardiomyopathy
2	Systolic anterior motion of the mitral valve
3	Subaortic stenosis
4	Shone complex and hypoplastic left heart syndrome
5	Diverticulum of the anterior mitral leaflet
6	Sinus of Valsalva aneurysm burrowing into the interventricular septum
7	Post surgical repair or spontaneous closure of perimembranous ventricular septal defect