retrosternal space

ret·ro·ster·nal space

on lateral chest radiographs, region dorsal to the sternum and ventral to the ascending aorta.
References in periodicals archive ?
Step 5-X-ray chest PA view, lateral view taken to rule out the right pulmonary artery dilatation >16 mm [characteristic of pulmonary arterial hypertension], lateral view to rule out retrosternal space obliteration [RVH].
Candidates exhibiting a flow murmur had invariably an excessively decreased retrosternal space resulting in a gross cosmetic deformity.
8) In this report, we present a rare case of a duplicated right diaphragmatic crus forming an accessory retrosternal space and discuss the clinical significance of this anatomical variant.
On the lateral film, the retrosternal space was opacified by the cardiac silhouette.
On a chest radiograph, features of pulmonary hypertension include enlarged main pulmonary arterial shadows and attenuation of peripheral pulmonary vascular markings; enlarged right ventricle may be recognized as loss of clear retrosternal space on lateral chest radiograph.