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Figure 6 Example of a Patient With a Sigmoid Septum

A single oblique sagittal view was used to assess the largest diameter of the interventricular septum and to grade the aspect of the interventricular septum as normal or sigmoid. In this patient, accurate positioning of the percutaneous aortic valve may be hampered by the small diameter of the left ventricular outflow tract (indicated by the double arrow). Therefore, multislice computed tomography can provide valuable information on the aspect of the left ventricular outflow tract and the septum prior to percutaneous valve procedures. Also, note the post-stenotic dilatation of the ascending aorta, indicated by the dotted arrow in this patient.