Lung
Retrosternal space
<2.5 cm
Radiography (Lateral)
Reference
Simon G, Pride NB, Jones NL et-al. Relation between abnormalities in the chest radiograph and changes in pulmonary function in chronic bronchitis and emphysema. Thorax. 1973;28 (1): 15-23.
Pubmed ID: 4685207
| DOI: 10.1136/thx.28.1.15