Eustachian valves were examined from the parasternal short axis, apical four-chamber, and subcostal sagittal and coronal views.
Future studies acquired from the subcostal position, or modifications in design of transducers may eliminate the bias towards underestimation.
Sweeping the transducer posteriorly to anteriorly from the subcostal window is helpful in clarifying the origin of the pulmonary trunk and its branches.
The atrial septum is best identified with subcostal four chamber sections.
This morphology is well seen in oblique subcostal sections.
This subcostal right anterior oblique section is from a patient with a perimembranous defect opening to the outlet portion of the right ventricle.
Thus, the diameter of the descending aorta was measured at the level of the diaphragm from a subcostal view.
All these abnormalities can be identified during infancy from subcostal paracoronal sections taken anterior to the atrioventricular valves.
