Severe subpulmonary obstruction caused by an aneurysmal tissue tag complicating an infundibular perimembranous ventricular septal defect.

A case of severe right ventricular obstruction caused by a huge aneurysmal tissue tag is described associated with a perimembranous ventricular septal defect with an infundibular extension. Angiograms and surgical inspection clearly showed that the ventricular septal defect extended into the outlet septum. The distinctive features of this case was the severity of the gradient related to the peculiar position of the aneurysmal tissue in the outlet portion of the ventricle. We presume that such an aneurysm, however small it is, developing in association with a ventricular septal defect with an infundibular extension may be a potential cause of severe obstruction and should therefore be carefully followed in the ensuing years.