CTICasesAneurysm of the Membranous Interventricular Septum
Imaging findings
CTA performed for planning of robotic mitral valve surgery incidentally shows an aneurysm of the membranous interventricular septum, situated entirely below the aortic valve, which appears normal. Cardiology records described it as a membranous septal VSD contained by valve tissue, with no demonstrable communication (shunt) at present.
Key takeaways
An aneurysm of the membranous ventricular septum is a recognized, likely congenital, entity that can be confused with a sinus venosus aneurysm and may represent a spontaneously contained or closed membranous VSD. Confirming that the lesion lies below and does not involve the aortic valve, and that no active shunt is present, is important for surgical planning and prognosis.
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