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Figure 7c. Severe dilatation of the RV with septal flattening in diastole in a 67-year-old woman with massive PE. The patient underwent fibrinolytic therapy immediately after diagnosis. (a, b) CT images of the short axes of the ventricles show that the RV is severely dilated relative to the LV. Unlike the LV, the RV demonstrates little variation in volume between systole (a) and diastole (b). Note the flattening of the interventricular septum in diastole. (c) CT image shows quantification of the septal flattening. The thin black lines delineate the endocardial borders of the inter-ventricular septum. The white lines are drawn perpendicular to the thin black lines at the mid distances of the endocardial borders. The radius of the interventricular septum (RIVS) is measured from the intersection of the white lines to the endocardial border (53).
