basic chest x-ray interpretationdspace.univer.kharkov.ua/bitstream/123456789/14668/3/... · 2019....
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Basic chest X-ray interpretation
V. N. Karazin Kharkiv National University
• Anton Litvin, assistant of Internal Medicine Department
• Maryna Shevchuk, associate professor of Internal Medicine Department
• Elvira Aydinova, assistant of Propaedeutics of Internal Medicineand Physical Rehabilitation Department
Part 2
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Content
• §4. CXR abnormalities
• §5. Common pathologies review
• §6. Test
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§4. CXR abnormalities
•Opacity patterns1. Consolidation
-Silhouette sign-Air bronchogram-Batwing sign
2. Atelectasis3. Nodule or mass
-Solitary nodule/mass-Nipple markings
-Multiple masses4. Interstitial
-Kerley lines
•Translucency patterns1. Cavity2. Cyst3. Emphysema
•Pathologic findings on CXR
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Pathologic findings on CXR
• Lung abnormalities are represented on CXR with:
• Areas of increased density => Opacity
• Areas of decreased density => Translucency
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Opacity patterns
• Areas of increased density (opacity) are divided into the following patterns:- Consolidation- Atelectasis- Nodule or mass (solitary or multiple)- Interstitial
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Opacity patterns
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Opacity patterns
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Opacity patterns
• Consolidation
• Atelectasis
• Nodule or mass
• Interstitial
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Consolidation• Consolidation is the result of replacement of air in the
alveoli by transudate, pus, blood, cells or other substances.Pneumonia is by far the most common cause of consolidation.
The key-findings on the X-ray are:
• Homogeneous ill-defined opacity obscuring vessels
• Silhouette sign: loss of lung/soft tissue interface
• Air-bronchogram
• Extention to the pleura or fissure, but not crossing it
• No volume loss
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Silhouette sign• Silhouette sign - the loss of the normal
silhouette of a structure.
• The heart is located anteriorly and it is bordered by the lingula of the left lung.The difference in density between the heart and the air in the lung enables us to see the silhouette of the left ventricle.When there is something in the lingula with the same density as the heart, the normal silhouette will be lost (blue arrow).
• When there is a pneumonia in the left lower lobe, the left ventricle will still be bordered by air in the lingula and we will still see the silhouette of the heart (red arrow).
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Silhouette sign
Ds: Right middle lobe opacification (RML pneumonia). Silhouette sign – positive.
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Silhouette sign
Ds: RLL pneumonia. Silhouette sign – negative.
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Air bronchogram
• Air bronchogram is a tubular outline of an airway made visible by filling of the surrounding alveoli by fluid or inflammatory exudates.
• It refers to the phenomenon of air-filled bronchi (dark) being made visible by the opacification of surrounding alveoli (grey/white).
• It is almost always caused by a pathologic airspace/alveolar process, in which something other than air fills the alveoli.
• Air bronchograms will not be visible if the bronchi themselves are opacified.
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Air bronchogram
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Batwing sign
• Batwing or butterfly pulmonary opacities refer to a pattern of bilateral perihilar shadowing on frontal CXR.
• Considered to be one of the most valuable imaging signs of pulmonary edema.
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Batwing sign
Ds: Alveolar pulmonary edema (dense airspace shadowing caused by fluid filling the alveoli and small airways;
batwing sign).
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Consolidation diff. diagnosis
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Opacity patterns
• Consolidation
• Atelectasis
• Nodule or mass
• Interstitial
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Atelectasis pattern• Atelectasis (lung-collapse) is the result of loss of air in a
lung or part of the lung with subsequent volume loss due to airway obstruction or compression of the lung by pleural fluid or a pneumothorax.
• Therefore, atelectasis refers to pneumothorax and pleural effusion.
• In many cases atelectasis is the first sign of a lung cancer.
• The key-findings on the X-ray are:- Sharply-defined opacity obscuring vessels without air-bronchogram.- Volume loss resulting in displacement of diaphragm, fissures, hili or mediastinum.
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Pneumothorax & Pleural effusion (Hydropneumothorax)
•Iatrogenic pneumotorax – result of unsuccessful thoracocentesis (pleural aspiration) in a patient with pleural effusion.•This X-ray shows dense opacification of the right lower zone - due to consolidation and a residual effusion (arrows) - and a pneumothorax (asterisks).
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Atelectasis diff. diagnosis
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Opacity patterns
• Consolidation
• Atelectasis
• Nodule or mass
• Interstitial
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Nodule/mass pattern
• Solitary pulmonary nodule (coin lesion) is a discrete, well-marginated, rounded opacity ≤ 3 cm in diameter that is completely surrounded by lung parenchyma, does not touch the hilum or mediastinum, and is not associated with adenopathy, atelectasis, or pleural effusion.
• Refers to a number of pathologies, foremost –metastases and TB.
• Masses are the lesions larger than 3 cm and they are treated as malignancies until proven otherwise.
• Multiple masses commonly refer to metastases.
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Solitary nodule/mass
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Solitary nodule/mass
Ds: Large rounded nodule in the right mid-zone; lung cancer?
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Nipple markings• The nipples are clearly
seen on this CXR, but care is needed whenever there is a chance that the markings may represent underlying lung nodules.
• If there is any doubt then a repeat chest X-ray should be performed, with metallic markers used to indicate the position of the nipples.
• Nipples are apparent on ~7.5% of all CXRs.
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Multiple masses
Ds: pulmonary metastases
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Nodule/mass diff. diagnosis
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Opacity patterns
• Consolidation
• Atelectasis
• Nodule or mass
• Interstitial
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Interstitial pattern
• Interstitial lung pattern refers to subtle thin lines and small dots interspersed throughout the lungs.
• The most effective way to evaluate imaging findings in interstitial lung disease is High Resolution Computer Tomography (HRCT).
• On HRCT there are four patterns: - Reticular- Nodular- High and low attenuation
On a CXR the most common pattern is reticular, while the others can be hardly determined.
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Reticular pattern (Kerley lines)
• Reticular interstitial pattern is represented on CXR with Kerley lines (septal lines).
• Kerley lines (septal lines) are thin linear pulmonary opacities caused by fluid or cellular infiltration into the interstitium of the lungs.
• A valuable sign of many pulmonary pathologies, first and foremost – pulmonary edema and pulmonary fibrosis.
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Reticular pattern (Kerley lines)
• There are 3 types of Kerley lines (septal lines):- Kerley A lines are long (2-6cm) unbranching lines coursing diagonally from the hila out to the periphery of the lungs. Kerley A lines are never seen without Kerley B or C lines .- Kerley B lines are short parallel lines at the lung periphery. Most common causes are pulmonary edema and interstitial pulmonary fibrosis; most commonly seen.- Kerley C lines are short, fine lines throughout the lungs; least commonly seen.
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Kerley B lines
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Interstitial diff. diagnosis
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Translucency patterns
• Areas of decreased density (lucency/translucency) are described as:
- Cavity - lucency with a thick wall and usually with a visible air-fluid level.
- Cyst - lucency with a thin wall.
- Emphysema - lucency without a visible wall.
• Generally refer to abscess, pneumothorax,TB and COPD.
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Cavity
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Cavity
Ds: Postprimary TB with cavities formation in the left upper lobe.
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Cavity
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Cavity
Ds:.Ds: Large right upper lobe cavitating lung mass with a thick wall and
air-fluid level within (abscess, probably of infectious origin).
Wall of abscess
Fluid level
Cavity
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Cavity
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Cavity
Ds: Cavitated squamous cell lung cancer (it forms a solid mass and then cavitatesinternally due to cell necrosis).
Sternal wires and clips – due to a previous history of coronary artery bypass graft (CABG) surgery.
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Cyst
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Cyst
Ds: Bilateral post pneumonic pneumatoceles with cysts in 4 months old infant. Draw your attention to thin wall, presence of air without liquid in cysts.
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Translucency diff. diagnosis
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Emphysema
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Emphysema
Bullae
Diaphragm flattering
Hyperexpansion
Ds: Bullous emphysema. Bilateral diffuse hyperlucency of lung fields. Large bilateral bullae in lower zones.
Flattering of diaphragm hemispheres. Hyperexpansion.
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§5. Common pathologies review
• Pneumonia
• Pulmonary edema
• Hydrothorax (pleural effusion)
• Pneumothorax
• Pulmonary abscess
• Pulmonary gangrene
• COPD
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Pneumonia
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• Pneumonia is the lung inflammatory condition affecting primarily the alveoli that results in filling them with pus.
• Has infectious etiology, foremost – bacterial.
• Characteristic on CXR:
- Consolidation- Air bronchogram- Not centered at hilum- No volume loss- Usually unilateral
Pneumonia
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Pneumonia
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Pneumonia
Ds: RUL pneumonia
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Pneumonia
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Pneumonia
Ds: RUL (focal) pneumonia
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Pneumonia
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Pneumonia
Ds: RUL pneumonia
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Pneumonia
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Pneumonia
Ds: LLL pneumonia
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Pulmonary edema
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Pulmonary edema• Pulmonary edema is fluid accumulation in the tissue
and air spaces of the lungs. Leads to impaired gas exchange and causes respiratory failure.
• Divided on cardiogenic (which is more common) and non-cardiogenic.
• Characteristic on CXR:- Kerley B (septlal) lines- Patchy opacification with air bronchograms- Batwing pattern- Increased cardiac size- Bilateral abnormalities, rarely - assymetrical- May be accompanied with pleural effusion
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Pulmonary edema
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Pulmonary edema
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Pulmonary edema
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Pulmonary edema
Kerley B lines
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Pleural effusion
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Pleural effusion
• Pleural effusion is excess fluid that accumulates in the pleural cavity.
• Depending on the nature of the fluid pleural effusion may be called hydrothorax (serous fluid), hemothorax (blood), urinothorax (urine),chylothorax (chyle), or pyothorax (pus).
• Big volume of pleural effusion usually refers to transudative pathophysiology (congestive heart failure, liver cirrhosis, nephrotic syndrome, malignancy).
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Pleural effusion
•It takes about 200-300 ml of fluid before it comes visible on an CXR.•About 5 liters of pleural fluid are present when there is total opacification of the hemithorax.
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Pleural effusion
• Effusion size is measured by counting intercostal spaces (ICS) from costophrenic angle:- Small- localized to 1 ICS (<500 mL )- Moderate 2–3 ICS (500–1000 mL )- Large ≥4 ICS (>1000 mL )
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• Characteristic on CXR:- Blunting of the costophrenic angle - Obscured hemidiaphragm- Homogenous opacity- Positive silhouette sign- Meniscus sign (absent in case of hydropneumothorax)- Volume loss (due to atelectasis)- Contralateral mediastinal shift (in case of large effusion) - Can be unilateral or bilateral
Pleural effusion
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Meniscus sign
•Ds: Large left-sided pleural effusion. Underlying bronchogenic carcinoma.•Meniscus sign – a concave line obscuring the costophrenic angle and part or all of the hemidiaphragm (fluid level gets a shape of half moon).
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Pleural effusion
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Pleural effusion
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Pleural effusion
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Pleural effusion
Ds: Right-sided moderate pleural effusion
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Pleural effusion
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Pleural effusion
Ds: Right-sided large pleural effusion
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Pleural effusion
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Pleural effusion
Ds: Right-sided total hydrothorax
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Pneumothorax
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Pneumothorax
• Pneumothorax - the presence of air or gas in the pleural cavity, causing collapse of the lung.
• It is classified as spontaneous(primary – no underlying disease, secondary – underlying disease is present), traumatic andiatrogenic.
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Pneumothorax
• Characteristic on CXR:- Visible visceral pleural edge/lung margin (seen as a very thin, sharp white line)- No lung markings are seen peripheral to this line- Peripheral space is radiolucent compared to the adjacent lung- Lung may completely collapse- Volume loss (due to atelectasis)- Contralateral mediastinal shift (in case of a large tense pneumothorax)*- Commonly unilateral
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Pneumothorax
• *Attention! Lung collapse without pneumothorax leeds to volume loss and pullingof mediastunum towards the affected side.
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Pneumothorax
Clearly visible visceral pleural edge (white arrows).
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Pneumothorax
• Pneumothorax size estimation helps to determine management of the patient.
• Small pneumothorax will typically resolve without treatment and requires only monitoring.
• Large pneumothorax requires pleural drainage.
Although size is an important factor,the clinical features are also considered.
Pleural drainage kit
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Pneumothorax
• Size of pneumothorax is established by measuring the distance between the chest wall and the lung.
• Measurement should be performed: - at the level of the hilum (GB; small <2 cm, large ≥2cm)- at the apex (USA; small <3cm, large ≥3 cm)
Air rim of 2 cm at the level of hilum means that the pneumothorax occupies about 50% of the hemithorax.
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Pneumothorax
Large pneumothorax (P) which is >2 cm depth at the level of the hilum.
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Pneumothorax
This image doesn’t respond British guidelines “large pneumothorax” requirements, but fits American guidelines requirements.
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Pneumothorax
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Pneumothorax
Ds: Right-sided large pneumothorax. Mediastinalshift to the left.
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Pneumothorax
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Pneumothorax
Ds: Left-sided large pneumothoraxwithout mediastinal shift.
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Pneumothorax
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PneumothoraxDs: Iatrogenic right-sided large pneumothorax with mediastinal shift. Small right-
sided pleural effusion.
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Abscess
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Abscess• Lung abscess is a type of liquefactive necrosis of
the lung tissue and formation of cavities with necrotic debris or fluid caused by microbial infection.
• Characteristic on CXR:- Cavity containing a gas-fluid level- Irregularly shaped or round/oval- May form an acute angle with the costal surface / chest wall- Most frequently occurs in the posterior segments of the upper lobes or the superior segments of the lower lobes- All margins are equally well seen- Usually unilateral
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Abscess
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Abscess
Ds: RUL abscess (RUL large cavity with horizontal level of liquid).
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Abscess
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Abscess
Ds: RUL abscess (RUL large cavity with horizontal level of liquid).
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Gangrene
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Gangrene• Pulmonary gangrene is pyogenic destruction of a
large area of lung (lobe, several lobes, whole lung) with tendency to further development.
• It refers to necrotizing pneumonia and cavitation.
• In fact – it’s a complication of anaerobic pneumonia(mainly caused by Klebsiella pneumoniae).
• Therefore, on X-ray its presented with opacifications and cavitations (with level of liquid).
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Gangrene
• Pulmonary gangrene needs to be differentiated with abscess and pneumonia.
• X-ray doesn’t allow to make a reliable conclusion in diagnostic of pulmonary gangrene.
• Diagnostics includes sputum microscopy/culture and specific clinical signs (along with laboratory and imaging methods).
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Gangrene vs. Abscess
• Abscess – a cavity with pus formed as a result of a decay of necrotized areas of lung, that is limited with granulation wall and perifocalinfiltration zone (=> thick distinct wall).
• Gangrene – necrosis of a significant area of lung without limitation (=> no distinct wall) with tendency to develop+ lab and clinical features.
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Gangrene
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Gangrene
Ds: LLL consolidation, LLL cavity. Pneumonia + Abscess? Gangrene?
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COPD
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COPD• Chronic Obstructive Pulmonary Disease (COPD) is a
common, preventable and treatable disease that is characterized by persistent respiratory symptoms and airflow limitation that is due to airway and/or alveolar abnormalities usually caused by significant exposure to noxious particles or gases (foremost – smoking).
• Has two components - chronic bronchitis and emphysema.
• Spirometry is the gold standard of diagnostic for COPD, CXR is an accessory investigation.
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COPD
• Characteristic on CXR (refers to emphysema):
- Hyperexpansion- Flattened diaphragm- Floating heart sign- Decreased peripheral bronchovascularmarkings- Increased lung lucency (parenchymal loss)- Bulla (round focal lucency over 1 cm)- Prominence of the hilar vesselsin pulmonary hypertension
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Floating heart sign
• Floating heart sign - visibility of the inferior border of the heart (heart appears to float above the diaphragm); refers to hyperexpansion.
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COPD
Ds: Emphysema (hyperexpansion, flattened diaphragm, hyperlucency of lung fields)
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COPD
Ds: Emphysema (hyperexpansion, flattened diaphragm, hyperlucency of lung fields, floating heart sign), cardiomegaly (CTR>0.5)
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§6. Test
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Bilateral small pleural effusion
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RUL pneumonia
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Left-sided pneumothorax
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Normal CXR
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Left-sided pneumothorax
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Disseminated nodular TB
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RML pneumonia*
*Silhouette sign positive => RML
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Right-sided pleural effusion
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RLL pneumonia
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Dextrocardia*
*the type of partial situs inversus: the gastric bubble is in its normal position on the left
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Right-sided pneumothorax. 2nd right rib fracture. Foreign body of right primary bronchus (tooth).
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Ectopia cordis*
*1st April joke at Radiopedia.comTrain your attention.
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References*
http://www.radiologymasterclass.co.uk/tutorials/tutorials/
https://radiopaedia.org/
http://www.wikiradiography.net/
http://www.radiologyassistant.nl/
*strongly recommended to medical students and young doctors.
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Don’t miss an elephant whilelooking for a fly!
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Thank you!