Superior Vena Cava
The superior vena cava (SVC) is a large, significant vein responsible for returning deoxygenated blood collected from the upper body to the right atrium. It is present within the superior and middle mediastinum.
Front image:
Right pulmonary artery
The right pulmonary artery supplies the right lung while the left pulmonary artery supplies the left lung. The right pulmonary artery courses posterior to the ascending aorta and anterior to the descending aorta. It lies anterior to the right mainstem bronchus.