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Anatomy of
Chest
Dr. Muhammad Bin Zulfiqar
PGR-1 FCPS SHL
Structures to identify
• Heart
• Lungs
• Mediastinum
• Pleural space
• Chest wall
• …Everything else!
– Bones, soft-tissues
IMAGING MODALITIES
1. Plain chest Radiograph
2. Fluoroscopy
3. Computerized tomography
4. Radionuclide lung scan
5. MRI
6. Ultrasound
7. Pulmonary angiography
Plain chest radiograph
• Diagnostic in 80% cases
• Standard views
1. Postero-anterior(P/A)
2. Lateral (right/left)
• Additional views
1. Oblique view(ribs)
2. Apical lordotic view
3. Expiration view
4. Decubitus view
CXR Interpretation
Normal structures visible
1. Tracheal air column.
2. Carina.
3. First rib.
4. Peripheral lung fields have no markings except:
5. The minor fissure.
6. Top of the R diaphragm is usually between the
anterior 6th & 7th ribs, and overlying the
posterior 10th & 11th ribs.
7. Left diaphragm is lower (in 90-95%) by roughly
half an interspace.
8. Inferior margins of the posterior ribs.
9. Anterior mediastinal line.
10. Superior vena cava.
11. Azygos vein.
12. Right descending pulmonary artery.
13. Pulmonary arteries and veins.
14. Right atrium.
15. Inferior vena cava.
16. Aortic arch.
17. Left pulmonary artery.
18. Border of the left ventricle.
19. Descending aorta.
20. Fat density lines in the intermuscular fascial
layers
Chest radiograph with
superimposed
mediastinal stripes.
Yellow: right
paratracheal stripe.
Light blue: right and
left paraspinal stripes.
Red: azygoesophageal
stripe. Brown:
pleuroesophageal
stripe. Purple:
anterior junction line
complex. Pink: left
subclavian artery
border. Light green:
posterior-superior
junction line. Dark
green: para-aortic
line.
Lobes and Fissures
RUL
LUL
RLL
RML
LLL
Left Lateral View Right Lateral View
LUL
LLL
RUL
RML
RLL
http://www.wikiradiography.com/page/Chest+Radiographic+Anatomy
AORTIC ARCH
LT. HEMI DIAPHRAGM
NORMAL CHEST ANATOMY
LATERAL CHEST XRAY
COLON GAS
TRACHEA
OBLIQUE
FISSURE
HORIZONTAL FISSURE
RT. HEMI
DIAPHRAGM
10
1. A line is drawn from
anterior surface of the
body of 6th thoracic
vertebrae passing
through the apex of the
heart up to anterior
lower most part of
diaphragm.
2. Another straight line is
drawn from anterior
surface of the body of T-
6 vertebrae to the
sternum.
.Segmental
Anatomy of Lung
Segmental
Anatomy of
Lung
Lateral view
On a normal lateral view the contours of the
heart are visible and the IVC is seen entering
the right atrium.
The retrosternal space should be radiolucent,
since it only contains air. Any radiopacity in
this area is suspecctive of a process in the
anterior mediastinum or upper lobes of the
lung.
As you go from superior to inferior over the
vertebral bodies they should get darker,
because usually there will be less soft tissue
and more radiolucent lung tissue (red arrow).
If this is not the case, look carefully for
pathology in the lower lobes.
The contours of the left and right
diaphragm should be visible.
The right diaphragm should be visible
all the way to the anterior chest wall
(red arrow).
Actually we see the interface between
the air in the lungs and the soft tissue
structures in the abdomen.
The left diaphragm can only be seen to
a point where it borders the heart
(blue arrow).
Here the interface is lost, since the
heart has the same density as the
structures below the diaphragm.
The left main pulmonary artery (in purple)
passes over the left main bronchus and is higher
than the right pulmonary artery (in blue) which
passes in front of the right main bronchus.
Pectus excavatum
In patients with a pectus excavatum the right heart border can be ill-defined, but this is normal.
It produces a silhouette sign and thus simulating a consolidation or atelectasis of the right middle
lobe.
The lateral view is helpful in such cases.
Pectus excavatum is a congenital deformity of the ribs and the sternum producing a concave
appearance of the anterior chest wall.
Vena azygos lobe
A common normal variant is the azygos lobe.
The azygos lobe is created when a laterally displaced azygos vein makes a
deep fissure in the upper part of the lung.
On a chest film it is seen as a fine line that crosses the apex of the right lung.
Here another patient with an azygos lobe.
The azygos vein is seen as a thick structure within the azygos
fissure.
In some patients an extra joint is seen in the anterior part of the
first rib at the point where the bone meets the calcified
cartilaginous part (arrow).
This may simulate a lung mass.
Cervical Rib
Computed Tomography
• Role of CT
– Main further investigation
for most CXR abnormality
(eg nodule/mass) or to
exclude disease with
normal CXR
– Main investigation for
certain scenarios (PE,
dissection, trauma)
Computed Tomography
• Numerous
protocols/techniques
depending on clinical
history
• Helical/spiral versus high
resolution
• Contrast
– Renal failure
– Allergy
Secondary lobule
The secondary lobule is the basic anatomic unit of pulmonary structure and function. It is the
smallest lung unit that is surrounded by connective tissue septa. The secondary lobule is
supplied by a small bronchiole (terminal bronchiole) in the center, that is paralleled by the
centrilobular artery.
Pulmonary veins and lymphatics run in the periphery of the lobule within the interlobular septa.
Centrilobular area is the central part of the secondary
lobule.
Perilymphatic area is the peripheral part of the secondary
lobule.
CT angiogram.
Frontal or
coronal view of
chest-3D slab
image showing
pulmonary
vessels.
MRI
• Multiple planes
• No radiation
• Common Indication
– Pancoast tumour
– Brachial plexus
– Cardiac
– Vascular (aorta)
• Usually targeted
examination (unlike
CT)
Coronal
Indications for MRI
•A chest MRI provides detailed pictures of tissues within the chest area.
•A chest MRI may be done for the following reasons:
•As an alternative to angiography, or to avoid repeated exposure to radiation
•Clarify findings from previous x-rays or CT scans
•Diagnose abnormal growths in the chest
•Evaluate blood flow
•Show lymph nodes and blood vessels
•Show the structures of the chest from multiple angles
•See if cancer in the chest has spread to other areas of the body - this is called
staging; staging helps guide future treatment and follow-up and gives you
some idea of what to expect in the future
•Tell the difference between tumors and normal tissue
Normal 32-year-old
female. MR angiography
derived maximum
intensity projection
reconstruction shows
normal pulmonary artery
anatomy: pulmonary
artery main stem (black
arrow), right pulmonary
artery (white arrow) and
left pulmonary artery
(asterisk).
the 3D reconstruction of the MRA image (1) allows the visualization of the entire pulmonary vasculature
identifying the subsegmental pulmonary arteries.
Dynamic contrast-enhanced MRA image in the oblique axial plane (2, 3, 4) allow the evaluation of pulmonary
circulation, including perfusion of the lung fields,
which is homogeneous and symmetric.
1: Right lung 2:Left lung
3:Cardiac silhouette 4.Mediastinum
THANK YOU
Anatomy of chest
Anatomy of chest
Anatomy of chest
Anatomy of chest

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Anatomy of chest

  • 1. Anatomy of Chest Dr. Muhammad Bin Zulfiqar PGR-1 FCPS SHL
  • 2. Structures to identify • Heart • Lungs • Mediastinum • Pleural space • Chest wall • …Everything else! – Bones, soft-tissues
  • 3. IMAGING MODALITIES 1. Plain chest Radiograph 2. Fluoroscopy 3. Computerized tomography 4. Radionuclide lung scan 5. MRI 6. Ultrasound 7. Pulmonary angiography
  • 4. Plain chest radiograph • Diagnostic in 80% cases • Standard views 1. Postero-anterior(P/A) 2. Lateral (right/left) • Additional views 1. Oblique view(ribs) 2. Apical lordotic view 3. Expiration view 4. Decubitus view
  • 5. CXR Interpretation Normal structures visible 1. Tracheal air column. 2. Carina. 3. First rib. 4. Peripheral lung fields have no markings except: 5. The minor fissure. 6. Top of the R diaphragm is usually between the anterior 6th & 7th ribs, and overlying the posterior 10th & 11th ribs. 7. Left diaphragm is lower (in 90-95%) by roughly half an interspace. 8. Inferior margins of the posterior ribs. 9. Anterior mediastinal line. 10. Superior vena cava. 11. Azygos vein. 12. Right descending pulmonary artery. 13. Pulmonary arteries and veins. 14. Right atrium. 15. Inferior vena cava. 16. Aortic arch. 17. Left pulmonary artery. 18. Border of the left ventricle. 19. Descending aorta. 20. Fat density lines in the intermuscular fascial layers
  • 6.
  • 7. Chest radiograph with superimposed mediastinal stripes. Yellow: right paratracheal stripe. Light blue: right and left paraspinal stripes. Red: azygoesophageal stripe. Brown: pleuroesophageal stripe. Purple: anterior junction line complex. Pink: left subclavian artery border. Light green: posterior-superior junction line. Dark green: para-aortic line.
  • 8.
  • 9. Lobes and Fissures RUL LUL RLL RML LLL Left Lateral View Right Lateral View LUL LLL RUL RML RLL http://www.wikiradiography.com/page/Chest+Radiographic+Anatomy
  • 10. AORTIC ARCH LT. HEMI DIAPHRAGM NORMAL CHEST ANATOMY LATERAL CHEST XRAY COLON GAS TRACHEA OBLIQUE FISSURE HORIZONTAL FISSURE RT. HEMI DIAPHRAGM 10 1. A line is drawn from anterior surface of the body of 6th thoracic vertebrae passing through the apex of the heart up to anterior lower most part of diaphragm. 2. Another straight line is drawn from anterior surface of the body of T- 6 vertebrae to the sternum.
  • 13. Lateral view On a normal lateral view the contours of the heart are visible and the IVC is seen entering the right atrium. The retrosternal space should be radiolucent, since it only contains air. Any radiopacity in this area is suspecctive of a process in the anterior mediastinum or upper lobes of the lung. As you go from superior to inferior over the vertebral bodies they should get darker, because usually there will be less soft tissue and more radiolucent lung tissue (red arrow). If this is not the case, look carefully for pathology in the lower lobes.
  • 14. The contours of the left and right diaphragm should be visible. The right diaphragm should be visible all the way to the anterior chest wall (red arrow). Actually we see the interface between the air in the lungs and the soft tissue structures in the abdomen. The left diaphragm can only be seen to a point where it borders the heart (blue arrow). Here the interface is lost, since the heart has the same density as the structures below the diaphragm.
  • 15. The left main pulmonary artery (in purple) passes over the left main bronchus and is higher than the right pulmonary artery (in blue) which passes in front of the right main bronchus.
  • 16. Pectus excavatum In patients with a pectus excavatum the right heart border can be ill-defined, but this is normal. It produces a silhouette sign and thus simulating a consolidation or atelectasis of the right middle lobe. The lateral view is helpful in such cases. Pectus excavatum is a congenital deformity of the ribs and the sternum producing a concave appearance of the anterior chest wall.
  • 17. Vena azygos lobe A common normal variant is the azygos lobe. The azygos lobe is created when a laterally displaced azygos vein makes a deep fissure in the upper part of the lung. On a chest film it is seen as a fine line that crosses the apex of the right lung.
  • 18. Here another patient with an azygos lobe. The azygos vein is seen as a thick structure within the azygos fissure.
  • 19. In some patients an extra joint is seen in the anterior part of the first rib at the point where the bone meets the calcified cartilaginous part (arrow). This may simulate a lung mass.
  • 21.
  • 22. Computed Tomography • Role of CT – Main further investigation for most CXR abnormality (eg nodule/mass) or to exclude disease with normal CXR – Main investigation for certain scenarios (PE, dissection, trauma)
  • 23. Computed Tomography • Numerous protocols/techniques depending on clinical history • Helical/spiral versus high resolution • Contrast – Renal failure – Allergy
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  • 47. Secondary lobule The secondary lobule is the basic anatomic unit of pulmonary structure and function. It is the smallest lung unit that is surrounded by connective tissue septa. The secondary lobule is supplied by a small bronchiole (terminal bronchiole) in the center, that is paralleled by the centrilobular artery. Pulmonary veins and lymphatics run in the periphery of the lobule within the interlobular septa.
  • 48. Centrilobular area is the central part of the secondary lobule. Perilymphatic area is the peripheral part of the secondary lobule.
  • 49.
  • 50. CT angiogram. Frontal or coronal view of chest-3D slab image showing pulmonary vessels.
  • 51. MRI • Multiple planes • No radiation • Common Indication – Pancoast tumour – Brachial plexus – Cardiac – Vascular (aorta) • Usually targeted examination (unlike CT) Coronal
  • 52. Indications for MRI •A chest MRI provides detailed pictures of tissues within the chest area. •A chest MRI may be done for the following reasons: •As an alternative to angiography, or to avoid repeated exposure to radiation •Clarify findings from previous x-rays or CT scans •Diagnose abnormal growths in the chest •Evaluate blood flow •Show lymph nodes and blood vessels •Show the structures of the chest from multiple angles •See if cancer in the chest has spread to other areas of the body - this is called staging; staging helps guide future treatment and follow-up and gives you some idea of what to expect in the future •Tell the difference between tumors and normal tissue
  • 53. Normal 32-year-old female. MR angiography derived maximum intensity projection reconstruction shows normal pulmonary artery anatomy: pulmonary artery main stem (black arrow), right pulmonary artery (white arrow) and left pulmonary artery (asterisk).
  • 54. the 3D reconstruction of the MRA image (1) allows the visualization of the entire pulmonary vasculature identifying the subsegmental pulmonary arteries. Dynamic contrast-enhanced MRA image in the oblique axial plane (2, 3, 4) allow the evaluation of pulmonary circulation, including perfusion of the lung fields, which is homogeneous and symmetric.
  • 55.
  • 56. 1: Right lung 2:Left lung 3:Cardiac silhouette 4.Mediastinum