What's on a Plain CXR

1 Clavicular companion shadow 
2 Trachea 
3 Aortic arch (knob) 
4 Lateral border of descending aorta 
5 Main pulmonary artery 
6 Azygo-esophageal line 
7 Posterior segment of right 7th rib 
8 Anterior segment of right 5th rib 
9 Left lateral costophrenic sulcus 
10 Gastric air bubble 

1 Posterior junction line 
2 Proximal right clavicle 
3 Aortic arch (knob) 
4 Coracoid process of scapula 
5 Inferior angle of scapula 
6 Carina 
7 Right main bronchus 
8 Left main bronchus 
9 Right minor (horizontal) fissure 
10 Right atrium 
11 Left ventricle 
12 Medial skinfold of left breast 
13 Medial border of scapula 

1 Aortic arch (knob) 
2 Carina of trachea 
3 Right lateral border of superior vena cava 
4 Left lateral border of descending aorta 
5 Left main bronchus 
6 Left upper lobe bronchus 
7 Left lower lobe bronchus 
8 Azygo-esophageal line 
9 Right hemidiaphragm 

1 Humeral head 
2 Right minor (horizontal) fissure 
3 Right hemidiaphragm 
4 Left hemidiaphragm 
5 Posterior margin of inferior vena cava 
6 Posterior pleural surface of right lung 
7 Posterior pleural surface of left lung 
8 Gastric air bubble 
9 Left posterior costophrenic sulcus 
10 Cortical margin of scapula 

1 Trachea 
2 Aortic arch 
3 Manubrium 
4 Body of sternum 
5 Sternomanubrial junction 
6 Oblique (major) fissure 

A Azygous fissure 
B Lateral border of left subclavian artery 
C Aortic arch 
D Main pulmonary artery 
E Right lower lobe pulmonary venous branch 
F Left lower lobe pulmonary artery branch 

Humeral head (ossification center) 
Coracoid process 
Left ventricle 
Right atrium