. The heart and the aorta; studies in clinical radiology . Fig. 40. TRICUSPID INSUFFICIENCY In frontal position the shadow of the right auricle is much enlarged,especially in the zone indicated by the arrow. Finally, in left anterior oblique position (Fig. 42) thecontour of the right auricle describes a curve of largediameter projecting over the shadow of the right ven-tricle, which is contrary to what has been described inFig. 37, where the ventricle is very large in relation tothe auricle. Sometimes the shadow of the right auricle may be in-creased without a corresponding increase in the vol
. The heart and the aorta; studies in clinical radiology . Fig. 40. TRICUSPID INSUFFICIENCY In frontal position the shadow of the right auricle is much enlarged,especially in the zone indicated by the arrow. Finally, in left anterior oblique position (Fig. 42) thecontour of the right auricle describes a curve of largediameter projecting over the shadow of the right ven-tricle, which is contrary to what has been described inFig. 37, where the ventricle is very large in relation tothe auricle. Sometimes the shadow of the right auricle may be in-creased without a corresponding increase in the volumeof this cavity. This is a fact observed in mitral is explained by the elevation of the right cavities andtheir closeness to the sternum as a result of the markeddevelopment of the left auricle. The obliquity of the 74 THE HEART AND THE AORTA heart from back to front is diminished; the projection ofthe auricle is increased as a result of the displacement ofthe organ and not because of its increase in
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