Left Atrium - The upper posterior border of the heart is formed by the left atrium. - Enlargement will result in bulging of the upper posterior contour Left Ventricle - Forms the lower posterior border. - Enlargement will displace the contour more posteriorly. Right Ventricle - The lower retrosternal space is filled by the right ventricle. - Enlargement of the right ventricle will result in more superior filling of this retrosternal space. #Anatomy #Radiology #CXR #Lateral #Atrium #Ventricle #Cardiac #Chambers #RadiologyAssistant
