Chest Radiology — MCQs

Chest Radiology Indian Medical PG Practice Questions and MCQs

Question 441: Which of the following radiographic features is most characteristically associated with the pathophysiology of congestive heart failure?

A. Pleural effusion
B. Kerley B lines (Correct Answer)
C. Perihilar bat wing appearance
D. All of the options

Explanation: ***Kerley B lines*** - **Kerley B lines** are characteristic of **pulmonary edema** due to **increased hydrostatic pressure** in the pulmonary capillaries, a hallmark of congestive heart failure. - They represent **edematous interlobular septa** and are typically seen in the lung periphery, especially at the lung bases. *Perihilar bat wing appearance* - A **perihilar bat wing appearance** or **pulmonary butterfly pattern** is seen in severe pulmonary edema, but it is not as specific or characteristic of the early stages of CHF pathophysiology as Kerley B lines. - This pattern indicates diffuse alveolar edema, often representing a later and more severe stage of pulmonary congestion. *Pleural effusion* - **Pleural effusion** can result from increased hydrostatic pressure in CHF, leading to fluid accumulation in the pleural space. - While common in CHF, it is a general finding that can also be caused by many other conditions, making it less specific for the pathophysiology of CHF itself compared to Kerley B lines. *All of the options* - While all listed features can be associated with congestive heart failure, **Kerley B lines** are considered the **most characteristic** in terms of directly reflecting the underlying pathophysiology of interstitial edema and increased pulmonary venous pressure. - The other options represent more general or later manifestations of the condition.

Question 442: Which radiographic view is best for evaluating pleural effusion?

A. AP view
B. Lateral decubitus view (Correct Answer)
C. PA view
D. Lateral view

Explanation: ***Lateral decubitus view*** - This view is highly sensitive for detecting small **pleural effusions** because it allows free fluid to layer along the dependent thoracic wall. - Positioning the patient with the suspected side down can reveal as little as **10-15 mL** of fluid, which appears as a crescentic opacity along the chest wall. *AP view* - The **AP (anterior-posterior)** view is generally less sensitive for detecting subtle pleural effusions, especially small ones. - In an AP view, fluid tends to layer posteriorly and may be obscured by the **diaphragm** or other lung structures, making it harder to discern. *PA view* - The **PA (posterior-anterior)** view is a standard chest radiograph but is not optimal for detecting small pleural effusions. - Larger effusions might blunt the **costophrenic angles** in this view, but smaller collections can still be missed as fluid may layer posteriorly. *Lateral view* - A standard **lateral chest X-ray** can show blunting of the posterior costophrenic sulcus if pleural effusion is present. - However, it is less sensitive than the lateral decubitus view for small effusions because it doesn't allow the fluid to freely pool and spread along a single dependent surface.

Question 443: In a patient with a suspected mediastinal mass, which imaging modality is most appropriate for initial evaluation?

A. Chest X-ray
B. CT scan (Correct Answer)
C. MRI
D. Ultrasound

Explanation: ***CT scan*** - A **CT scan (Computed Tomography)** is the most appropriate initial imaging modality for assessing a suspected mediastinal mass due to its superior ability to visualize **soft tissue structures**, define the extent of the mass, and identify its relationship to surrounding organs. - It provides detailed cross-sectional images, which are crucial for differentiating between **solid** and **cystic lesions** and for planning further diagnostic steps like biopsy. *Chest X-ray* - While a **chest X-ray** may initially detect a widening of the **mediastinum** or a mass, it lacks the detailed anatomical resolution needed to characterize the mass, its precise location, or its relationship to adjacent structures. - It serves as a **screening tool** but is insufficient for definitive initial evaluation of a suspected mediastinal mass. *MRI* - **MRI (Magnetic Resonance Imaging)** offers excellent soft tissue contrast, especially for evaluating **vascular structures** and distinguishing between different tissue types within a mass, but it is generally reserved for **secondary evaluation** or specific cases where a CT scan is inconclusive or contraindicated. - Its longer acquisition time and higher cost make it less suitable for **initial assessment** compared to CT. *Ultrasound* - **Ultrasound** has limited utility for deep mediastinal structures due to interference from **bone** and **air** in the lungs. - It is primarily used for guiding **biopsies** of superficial mediastinal lesions or for evaluating structures in the **anterior mediastinum** that are close to the chest wall.

Question 444: Snow storm appearance on chest X-ray is seen in -

A. Anthracosis
B. Byssinosis
C. Silicosis (Correct Answer)
D. Bagassosis

Explanation: ***Silicosis*** - **Silicosis** is a chronic fibrotic lung disease caused by the inhalation of **silica dust**, common in mining and quarry work. - The "snow storm" appearance on a chest X-ray is due to widespread, fine-to-medium sized **nodular opacities**, characteristic of diffuse pulmonary fibrosis seen in silicosis. *Anthracosis* - **Anthracosis** is caused by the inhalation of **coal dust** and typically presents with fine, discrete nodules that are less widespread and dense compared to silicosis, hence not a "snow storm." - It primarily affects coal miners and can lead to **coal workers' pneumoconiosis**, which may have various radiographic patterns, but "snow storm" is not typical. *Byssinosis* - **Byssinosis** is an occupational lung disease affecting workers exposed to **cotton, flax, or hemp dust**, typically causing chest tightness and shortness of breath, particularly on the first day back to work. - It is more of an **occupational asthma-like syndrome** and is not characterized by the nodular lung appearances seen in pneumoconioses like silicosis on a chest X-ray. *Bagassosis* - **Bagassosis** is a form of **hypersensitivity pneumonitis** caused by exposure to moldy sugarcane (bagasse), leading to an allergic inflammatory reaction in the lungs. - Its radiographic features commonly include **interstitial infiltrates** or ground-glass opacities, but not the distinct nodular "snow storm" pattern associated with silicosis.

Question 445: For which of the following conditions is CT thorax considered the gold standard imaging modality for diagnosis?

A. Ascending Aortic dissection
B. Descending Aortic dissection (Correct Answer)
C. Aortic aneurysm
D. Cystic fibrosis

Explanation: ***Descending Aortic dissection*** - **CT angiography (CTA) of the chest** is considered the **gold standard** for diagnosing **aortic dissection**, including descending aortic dissection, due to its excellent sensitivity (95-100%) and specificity (95-100%). - CTA rapidly provides detailed anatomical information including visualization of the intimal flap, true/false lumens, extent of dissection, and involvement of branch vessels, which is crucial for immediate management decisions. - It is widely available, non-invasive, and can be performed quickly in emergency settings. *Ascending Aortic dissection* - While **CTA is also the primary imaging modality** for ascending aortic dissection, **transesophageal echocardiography (TEE)** is sometimes preferred in certain clinical scenarios due to its superior real-time imaging capabilities of the aortic root and valve. - TEE can assess for associated complications like **pericardial effusion** or **aortic regurgitation** more effectively and is valuable for intraoperative guidance. - However, **CTA remains the most commonly used first-line gold standard** for both ascending and descending dissections in emergency departments due to speed and availability. *Aortic aneurysm* - **CT angiography** is excellent for detecting and characterizing aortic aneurysms, but it is not universally considered the sole \"gold standard\" for all types, as **ultrasound** is the preferred screening tool for abdominal aortic aneurysms. - The choice of imaging depends on the location and specific clinical context, with MRI sometimes offering advantages for complex cases or in patients where radiation exposure is a concern. *Cystic fibrosis* - The diagnosis of **cystic fibrosis** primarily relies on **sweat chloride testing** and **genetic testing** (CFTR mutation analysis), not imaging. - While high-resolution CT can show characteristic lung changes (bronchiectasis, mucus plugging) associated with cystic fibrosis, it is used for monitoring disease progression and complications, not for initial diagnosis.

Question 446: Which radiographic sign is most characteristic of acute alveolar pulmonary edema?

A. Westermark's sign
B. Hampton's hump
C. Kerley B lines
D. Bat wing sign (Correct Answer)

Explanation: ***Bat wing sign*** * The **bat wing** or **butterfly appearance** on chest X-ray is the most characteristic finding of **acute alveolar pulmonary edema**, showing symmetric perihilar infiltrates that spare the apices and bases. * Represents fluid accumulation in the **alveolar spaces** with a characteristic central distribution pattern due to preferential gravitational and anatomical factors. * This is a classic radiographic hallmark of **severe cardiogenic pulmonary edema**. *Kerley B lines* * **Kerley B lines** are thin, horizontal lines (1-2 cm long) at the lung periphery, typically at costophrenic angles, indicating **thickened interlobular septa**. * These are associated with **interstitial pulmonary edema** (earlier/milder stage) rather than the alveolar flooding seen with the bat wing pattern. * While present in pulmonary edema, they represent a different stage and pattern than the acute alveolar edema characteristic of bat wing sign. *Westermark's sign* * Indicative of **pulmonary embolism**, characterized by **dilated pulmonary artery proximal to an embolus** with collapsed vessels distally. * Shows **regional hyperlucency** (oligemia) due to reduced blood flow, not fluid accumulation. *Hampton's hump* * A wedge-shaped peripheral opacity with its base against the pleura, seen in **pulmonary embolism** due to **lung infarction**. * Represents hemorrhagic infarction, unrelated to pulmonary edema.

Question 447: Chest x-ray is showing reticulonodular pattern. The causative agent is?

A. Staph aureus
B. Pneumococcus
C. Pseudomonas
D. Pneumocystis jirovecii (Correct Answer)

Explanation: ***Pneumocystis jirovecii*** - **Pneumocystis pneumonia (PCP)**, caused by *Pneumocystis jirovecii*, classically presents with a **diffuse reticulonodular or ground-glass infiltrate** on chest X-ray. - This organism primarily affects **immunocompromised individuals**, such as those with HIV/AIDS, making this radiographic pattern highly suggestive. *Staph aureus* - *Staphylococcus aureus* pneumonia typically presents with **lobar consolidation**, **cavities**, or **abscess formation**, not a widespread reticulonodular pattern. - It's a common cause of **healthcare-associated pneumonia** and **secondary bacterial pneumonia** after viral infections. *Pneumococcus* - *Streptococcus pneumoniae* (Pneumococcus) usually causes **lobar pneumonia**, characterized by **homogenous consolidation** in one or more lung lobes. - While it's the most common cause of community-acquired pneumonia, it does not typically produce a reticulonodular pattern. *Pseudomonas* - *Pseudomonas aeruginosa* pneumonia often presents with **bronchopneumonia** or **necrotizing pneumonia**, frequently seen in **ventilated patients** or those with **cystic fibrosis**. - Radiographic findings can include **multi-lobar infiltrates**, **cavitation**, and **effusions**, which differ from a reticulonodular pattern.

Question 448: The 'Floating Water Lily' sign is associated with which of the following conditions?

A. Pulmonary Aspergillosis
B. Pulmonary Hamartoma
C. Ruptured Hydatid Cyst (Correct Answer)
D. Cavitating Lung Metastasis

Explanation: ***Ruptured Hydatid Cyst*** - The **'Floating Water Lily' sign**, also known as the **'Water Lily sign'** or **'Camelot sign'**, is pathognomonic for a **ruptured pulmonary hydatid cyst**. - It occurs when the endocyst membrane ruptures and detaches from the pericyst, flaring up within the existing cyst fluid, creating a characteristic appearance on imaging. *Pulmonary Aspergillosis* - While pulmonary aspergillosis can form **fungus balls (aspergillomas)** within pre-existing lung cavities, the characteristic sign is the **'air crescent sign'**, not the 'floating water lily' sign. - Aspergillomas typically involve the fungus growing in a cavity, often with an air interface, but do not feature a detached, floating membrane. *Pulmonary Hamartoma* - A pulmonary hamartoma is a **benign tumor** of the lung, typically appearing as a solitary, well-defined nodule. - It does not rupture or form fluid-filled structures that would give rise to the 'floating water lily' sign. *Cavitating Lung Metastasis* - Cavitating lung metastases are malignant lesions that undergo **central necrosis**, leading to cavity formation. - Although they form cavities, they do not involve the detachment of parasitic membranes, and therefore, the 'floating water lily' sign is not observed.

Question 449: HRCT features of interstitial pneumonia include all of the following EXCEPT:

A. Reticular opacities
B. Honeycombing
C. Ground glass opacities
D. Bronchiectatic features (Correct Answer)

Explanation: ***Bronchiectatic features*** - **Bronchiectatic features** (e.g., dilatation of bronchi) are usually indicative of diseases that cause destruction and widening of the airways, such as **cystic fibrosis** or severe infections, rather than primary interstitial lung diseases. - While some interstitial lung diseases can have associated airway abnormalities, **bronchiectasis** is not a hallmark or typical primary feature of **interstitial pneumonia** itself. *Reticular opacities* - **Reticular opacities**, appearing as a network of fine lines, are a common and characteristic finding in many forms of **interstitial pneumonia**, particularly those with **fibrotic changes**. - They represent **interstitial thickening** due to fibrosis or inflammation. *Honeycombing* - **Honeycombing**, characterized by clustered **cystic airspaces** usually less than 1 cm in diameter, is a definitive sign of **end-stage pulmonary fibrosis**, a common outcome of chronic interstitial pneumonia. - It is considered an irreversible feature and indicates significant architectural distortion of the lung parenchyma. *Ground glass opacities* - **Ground glass opacities** (GGOs) refer to a hazy increase in lung attenuation with preservation of **bronchial and vascular margins**, often seen in various stages of interstitial pneumonia. - GGOs can reflect active **inflammation**, cellular infiltration, or mild fibrosis and are often potentially reversible.

Question 450: Which of the following is NOT a chest radiographic feature of left atrial enlargement?

A. Elevated left main bronchus
B. Boot-shaped heart (Correct Answer)
C. Splaying of carina
D. Enlargement of left atrial appendage

Explanation: ***Boot-shaped heart*** - A **boot-shaped heart** (coeur en sabot) is characteristic of **Tetralogy of Fallot** due to right ventricular hypertrophy, NOT left atrial enlargement. - This configuration results from an upturned cardiac apex and concave main pulmonary artery segment. - This is the correct answer as it is **NOT** a radiographic feature of left atrial enlargement. *Elevated left main bronchus* - This **IS a feature** of left atrial enlargement, where the enlarged left atrium pushes superiorly on the left main bronchus. - The normal carinal angle is about 60 degrees; left atrial enlargement increases this angle. *Enlargement of left atrial appendage* - This **IS a feature** of left atrial enlargement, commonly seen in conditions like mitral stenosis. - The left atrial appendage creates a convex bulge along the left cardiac border below the pulmonary artery segment. - It is a common site for thrombus formation in atrial fibrillation with mitral valve disease. *Splaying of carina* - This **IS a feature** of left atrial enlargement, where the enlarged left atrium pushes the carina superiorly from below. - A carinal angle greater than **75-90 degrees** is generally considered indicative of left atrial enlargement. - Also called widening of the subcarinal angle.

Practice by Chapter

Normal Chest Radiographic Anatomy

Practice Questions

Radiographic Signs in Chest Imaging

Practice Questions

Pulmonary Infections

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Chronic Obstructive Pulmonary Disease

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Interstitial Lung Diseases

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Pulmonary Neoplasms

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Pleural Diseases

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Mediastinal Pathology

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Congenital and Developmental Chest Anomalies

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Pulmonary Vascular Diseases

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Chest Trauma Imaging

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Post-Surgical Chest Imaging

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