CTICasesSubaortic Membrane
Imaging findings
Multiplanar reformats of the chest CT angiogram demonstrate a thin, shelf-like subaortic membrane causing significant narrowing along the left ventricular outflow tract (LVOT). There is asymmetric thickening of the aortic valve leaflets, particularly toward the right and non-coronary cusps, resulting from the eccentric jet of turbulent flow across the membrane. Mild, concentric left ventricular hypertrophy is also present.
Key takeaways
A subaortic membrane is a congenital cardiac lesion that can cause progressive left ventricular outflow tract obstruction. The turbulent, high-velocity jet of flow directed across the membrane typically leads to asymmetric and progressive damage to the aortic valve leaflets, often requiring surgical resection of the membrane.
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