chest x-rays - himsr...chest x-rays dr umar radiographic densities different tissues in our body...
TRANSCRIPT
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Chest X-raysDr Umar
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Radiographic Densities
Different tissues in our bodyabsorb X-rays at differentextent
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Technical aspects…P-VERB
1. Patient’s details
2. View : PA vs AP or lateral
3. Exposure
4. Rotation
5. Breath: Inspiration or Expiration
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4 major views
1. Posterior-anterior (PA)
2. Anterior-Posterior (AP)
3. Lateral
4. Lateral decubitus
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PA view
•Standard view for routine Chest x-rays•Taken in full inspiration
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AP view
•Patient is too ill to stand or non-cooperative•Heart at a greater distance from film, appears enlarged
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PA vs AP view
PA view AP view
Clavicle Over lung fields Above lungs apex
Scapulae Away from lung fields Over lung fields
Ribs Posterior ribs distinct Anterior ribs distinct
Heart Relatively enlarged
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Lateral view
•Lung lobes, mediastinum & bony thoracic cavity better visualized•Useful for lobar pathology, mediastinal masses, encysted pleural fluid & basal consolidation
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Lateral decubitus view
•Specialized projection to demonstrate small pleural effusions or pneumothorax
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Exposure
•Adequate exposure: Inter-vertebral spaces barely visiblethrough the heart shadow
Over-exposed film Under-exposed film
Inter-vertebral spaces clearly visibile through heart shadow
Inter-vertebral spaces clearly visibile through heart shadow
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Rotation
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Good Inspiration•6 anterior ribs visible•10 posterior ribs visible
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Normal Chest X-ray
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Interpreting Chest X-raysABCDEFGH approach
• Airway
• Bones & soft tissue
• Cardiac shadow
• Diaphragm
• Effusion (pleura)
• Fields (lungs)
• Gastric bubble
• Hila & mediastinum
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Normal Chest X-ray
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Counting Ribs
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Lateral view
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Airway
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Right Lung Anatomy
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Left Lung Anatomy
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Lung Zones
Upper zone: above line through anterior end of 2nd rib
Middlezone
zone: between upper and line through
anterior end of 4nd rib
Lower zone: below mid zone
• Radiological zone doesn’tusually correspond to lunglobe
• To see a lobe, always take alateral film
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Cardiac Anatomy
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Cardiac Anatomy
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Cardiac Anatomy
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Silhouette sign
Lobe Adjacent structure
RUL Ascending aorta
RML Right heart border
RLL Right hemidiaphragm
LUL Aortic knuckleLeft heart border (lingula)
LLL Left hemidiaphragm Descending aorta
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Cardio-thoracic Ratio(PA view)
Normal CT ratio <0.5
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Diaphragm
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Hila
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Mediastinal widening
Definition: Mediastinum width greater than 6 cm on erect PA view or 8 cm on supine AP view
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Mediastinal Masses
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Hidden Areas
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CARDIAC PATHOLOGY
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Cardiac X-rays
• Right ventricular enlargement
• Left ventricular enlargement
• Mitral stenosis
• Congestive heart failure
• Pericardial effusion
• Pulmonary hypertension
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Right Ventricular Enlargement
• CT ratio >0.5
• Cardiac apex is round and elevated abovediaphragm
• Cardio-phrenic is acute
angle
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Left Ventricular Enlargement
• CT ratio >0.5
• Cardiac apex displaceddownwards & to left
• Cardio-phrenic angle isobtuse & merges withdiaphragm
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Mitral Stenosis
• Cardiomegaly (RV type)
• Straightening of left heart border
• Double right heart border
• Splaying of carinal angle
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Mitralisation of heart
Mitralisation of heart means straightening of the left border of heart
1. Aortic knuckle: small
2. Pulmonary conus: enlarged
3. Left atrial appendage: prominent
4. Left border of left ventricle: no change
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Congestive Heart Failure
• Increased interstitial markings
• Upper zone vascular redistribution
• Bilateral Pleural effusion
• Cardiomegaly (LV type)
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Congestive Heart Failure
• “Bat-wing” appearance
• Kerley B lines
• Cardiomegaly (LV type)
• Min pleural effusions
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Pericardial Effusion
• CT ratio >0.5
• Globular heart shadow
• “Water bottle” sign
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Pulmonary Hypertension
• Enlarged pulmonary arteries❖ >16 mm right descending
pulmonary artery (PA view)
❖ >18 mm left descending pulmonary artery (lateral view)
• Prominent pulmonary outflowtract
• Peripheral pulmonary vessels pruning
• Right ventricular hypertrophy
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LUNG PATHOLOGY
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The white lung fields(radio-opacity)
• Pleural effusion
• Consolidation
• Collapse
• Fibrosis
• Coin lesion
• Miliary lesion
• Lung mass
• Hilar Lymphadenopathy
• Pulmonary edema
• Hemithorax
The black lung fields(radio-lucency)
• Pneumothorax
• Hydropneumothorax
• Cavitating lesion
• Emphysema
• Subcutaneous emphysema
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Pleural Effusion
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Pleural Effusion
How to detect minimal pleural effusion ???
• CXR-PA: 150-175 ml
• CXR-lateral decubitus: 10-50 ml
• USG thorax: 3-5 ml
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Consolidation
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Consolidation
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Collapse
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Collapse
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Fibrosis
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Solitary Pulmonary Nodule (Coin lesion)
• Granulomas: tuberculoma, histoplasmosis, aspergilloma
• Bronchial carcinoma• Bronchial adenoma• Lung abscess• Encysted pleural effusion• Pseudotumor• Pulmonary hemartoma• Hydatid cyst• Rheumatoid nodule• Wegners’s nodule
40% SPN are malignant
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Miliary lesions
• Miliary tuberculosis
• Sarcoidosis
• Pulmonary eosinophilia
• Histoplasmosis
• Pneumoconioses
• Hemosiderosis
• Miliary metastasis thyroid, renal, breast, prostate, osteosarcoma
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Pulmonary Metastasis
Miliary nodules: <2 mm Pulmonary nodule: 7-30 mm
Pulmonary micronodule: 2-7 mm Pulmonary mass: >30mm
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Lung Mass
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Hilar Lymphadenopathy
Bilateral hilar lymphadenopathy
• Sarcoidosis
• Lymphoma
• Tuberculosis
• Histoplasmosis
• Pnemuconiosis: silicosis
Unilateral hilar lymphadenopathy
• Lymphoma
• Carcinoma
• Tuberculosis
• Histoplasmosis
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Pulmonary Edema
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Radiographic feature Cardiogenic pulmonary edema (LVF)
Noncardiogenic pulmonary edema (ARDS)
Heart size Enlarged Nornal
Vascular distribution Balanced or inverted Normal or balanced
Distribution of edema Even or central Patchy or diffuse
Pleural effusion Present Not usually present
Peribronchila cuffing Present Not usually present
Septal lines Present Not usually present
Air bronchograms Not usually present Usually present
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Hemithorax
Mediastinum pushed away from the opacified side
• Pleural effusion
• Large lung mass
• Diaphragmatic hernia
Mediastinum pulled toward the opacified side
• Total lung collapse
• Pneumonectomy
• Pulmonary hypoplasia/agenesis
Mediastinum remains central in position
• Consolidation
• Pleural/chest wall mass
• Combination of pathologies
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Hemithorax
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Hemithorax
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Pneumothorax
Which film preferred ???
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Hydropneumothorax
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Pulmonary Cavity
• Carcinoma
• Autoimmune: Wegner granulomatosis and rheumatoid nodule
• Vascular: emboli (septic/bland)
• Infection/abscess: bacterial (Klebsiella, Staphalococcus, anareobic infections), fungal (histoplasmosis), amebic, hydatid cyst
• Trauma: pnematocele
• Young: congenital,bronchogenic cyst
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Pulmonary Cavity
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Pulmonary Tuberculosis
• Apical or posterior segmentof upper lobes or superiorsegments of lower lobesmostly involved
• Active tuberculosis:
Infiltrates, consolidations,cavities, mediastinal orhilar lymphadenopathy
• Healed tuberculosis: Pulmonary nodules, fibrotic scars, bronchiectasis andpleural scarring
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Emphysema
Pathognomic sign ???