Chest Radiology Practice Questions

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

CT scan. ***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.

Q: Identify the most likely diagnosis based on the chest X-ray findings in a patient with low-grade fever.

Miliary TB. ***Miliary TB*** - The chest X-ray shows diffuse, small, uniformly distributed nodular opacities (2-3 mm in diameter) bilaterally, characteristic of "**millet seed**" pattern seen in **miliary tuberculosis**. - This pattern results from the hematogenous spread of *Mycobacterium tuberculosis* throughout the lungs, often presenting with **low-grade fever** and constitutional symptoms. *ILD* - **Interstitial lung disease (ILD)** typically shows reticular, nodular, or ground-glass opacities, sometimes with honeycombing, but the pattern is usually more heterogeneous and often basal or peripheral, unlike the uniform fine nodularity seen here. - While some ILDs can present with diffuse nodular patterns, the clinical context of **fever** and the classic "millet seed" appearance are more indicative of miliary TB. *Bronchopneumonia* - **Bronchopneumonia** presents as patchy, often ill-defined, multifocal areas of opacification or consolidation, usually distributed around the bronchi. - It does not typically cause the fine, diffuse, and uniform nodular pattern seen in this image, which represents widespread interstitial or alveolar involvement rather than primarily bronchial inflammation. *Consolidation* - **Consolidation** appears as a homogeneous opacification that obliterates vessels and airway walls, often with air bronchograms, typically confined to a lobe or segment. - The image shows diffuse nodular infiltrates rather than large, confluent areas of homogeneous opacification, making isolated consolidation an unlikely primary description.

Q: Identify the condition represented in the chest radiograph.

Miliary tuberculosis. ***Miliary tuberculosis*** - The chest radiograph displays numerous small, well-demarcated **nodules (1-3 mm)** scattered diffusely and uniformly throughout both lung fields. - This widespread, uniform distribution of **miliary nodules** resembling millet seeds is pathognomonic for **miliary tuberculosis**, indicating hematogenous dissemination of *Mycobacterium tuberculosis*. - The **bilateral, symmetrical involvement** with countless tiny nodules of uniform size is characteristic. *Bronchiectasis* - Bronchiectasis on chest radiograph shows **dilated, thickened bronchi** appearing as parallel linear opacities ("tram-track sign") or ring-like structures. - **Increased bronchovascular markings** and areas of cystic lucencies may be visible, not the diffuse miliary nodular pattern seen here. *COPD* - COPD shows **hyperinflation** with flattened diaphragms, increased retrosternal airspace, and bullae. - **Emphysema** produces areas of hyperlucency and vascular attenuation, while **chronic bronchitis** shows increased bronchovascular markings and peribronchial thickening. - Neither produces the uniform miliary nodular pattern characteristic of this image. *Lung cancer* - Primary lung cancer typically presents as a **solitary pulmonary nodule or mass**, often with irregular margins and associated findings like lymphadenopathy or pleural effusion. - While **pulmonary metastases** can present as multiple nodules, they are typically **larger (>5 mm), variable in size**, and less uniformly distributed than the miliary pattern seen here.

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

Bat wing sign. ***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.

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

Silicosis. ***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.

Q: Kerley B lines are seen in mitral stenosis when the resting left atrial pressure exceeds which value?

20 mm Hg. ***20 mm Hg*** - **Kerley B lines** are radiographic signs of **interstitial pulmonary edema**, which in mitral stenosis occurs when the **left atrial pressure** (and subsequent pulmonary venous pressure) rises sufficiently to force fluid into the **lymphatic system** and **interlobular septa**. - This typically happens when the left atrial pressure exceeds approximately **20-25 mmHg**, indicating significant pulmonary congestion and initiating lymphatic engorgement that becomes visible as linear opacities. *10 mm Hg* - A left atrial pressure of 10 mm Hg is generally considered within the **normal physiological range** or only slightly elevated. - At this pressure, the pulmonary capillaries do not typically transude enough fluid to cause **interstitial edema** visible as Kerley B lines. *30 mm Hg* - While a left atrial pressure of 30 mm Hg would definitely cause Kerley B lines to be present, it represents a more severe degree of **pulmonary edema** than the threshold for their initial appearance. - Such pressures often lead to more extensive signs of pulmonary congestion, including **alveolar edema**. *40 mm Hg* - A left atrial pressure of 40 mm Hg indicates **severe pulmonary venous hypertension** and would result in florid **pulmonary edema**, likely including **alveolar edema** in addition to interstitial edema and Kerley B lines. - This is well above the threshold required for the initial appearance of Kerley B lines.

Q: Chest x-ray of a child presenting with acute breathlessness. What is the most likely diagnosis?

Pneumothorax. ***Pneumothorax*** - A **pneumothorax** occurs when air leaks into the space between the lung and chest wall, leading to lung collapse or partial collapse. - The chest X-ray shows a **collapsed left lung** with a prominent **visceral pleural line**, indicating air in the pleural space, which is characteristic of pneumothorax. - This is the most common cause of **acute breathlessness** with this radiographic appearance in children. *Pneumatocele* - A **pneumatocele** is a thin-walled, air-filled cyst within the lung parenchyma, often forming after pneumonia or trauma. - While air-filled, pneumatoceles are **intraparenchymal** (within lung tissue) and appear as round lucencies, not causing a collapsed lung with a pleural line. *Pleural effusion* - **Pleural effusion** presents with fluid (not air) in the pleural space, causing **blunting of costophrenic angles** and a homogeneous white opacity. - The radiographic findings show air and lung collapse, not fluid accumulation. *Normal* - A **normal chest X-ray** would show fully expanded lungs bilaterally with appropriate vascular markings and no pleural abnormalities. - The presence of lung collapse and visceral pleural line clearly indicates pathology.

Q: HRCT features of interstitial pneumonia include all of the following EXCEPT:

Bronchiectatic features. ***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.

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

Boot-shaped heart. ***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.

Q: Which of the following statements about HRCT (High Resolution Computed Tomography) is false?

Cannot provide detailed imaging of lung tissues. ***Cannot provide detailed imaging of lung tissues*** - This statement is **false** because HRCT is specifically designed to provide **highly detailed images** of the lung parenchyma, which is crucial for diagnosing and characterizing diffuse lung diseases. - Its high spatial resolution allows for the visualization of subtle abnormalities in the **interstitium**, airways, and alveoli that would be missed by conventional CT. - HRCT is the **gold standard** for imaging fine lung architecture. *Investigation of choice for interstitial lung disease* - This statement is **true**; HRCT is considered the **gold standard imaging modality** for the diagnosis, classification, and monitoring of various **interstitial lung diseases (ILDs)**. - It effectively identifies characteristic patterns such as **pulmonary fibrosis**, ground-glass opacities, honeycombing, and reticular opacities. *Has narrow beam collimation* - This statement is **true**; HRCT employs **narrow beam collimation** (typically 1-2 mm) to acquire thin slices through the lung. - This narrow collimation is essential for maximizing spatial resolution and minimizing partial volume averaging, which is a key technical feature that enables detailed imaging. *Uses thin slice thickness* - This statement is **true**; HRCT utilizes **thin slice thickness** (1-2 mm) which is fundamental to its high-resolution capability. - Thin slices reduce partial volume averaging and allow for better visualization of fine lung structures, distinguishing HRCT from conventional CT which uses thicker slices (5-10 mm).

Question 1

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

Accepted Answer

CT scan

Answer

Chest X-ray

Answer

MRI

Answer

Ultrasound

Question 2

Identify the most likely diagnosis based on the chest X-ray findings in a patient with low-grade fever.

Accepted Answer

Miliary TB

Answer

ILD

Answer

Bronchopneumonia

Answer

Consolidation

Question 3

Identify the condition represented in the chest radiograph.

Accepted Answer

Miliary tuberculosis

Answer

Bronchiectasis

Answer

COPD

Answer

Lung cancer

Question 4

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

Accepted Answer

Bat wing sign

Answer

Westermark's sign

Answer

Hampton's hump

Answer

Kerley B lines

Question 5

Snow storm appearance on chest X-ray is seen in -

Accepted Answer

Silicosis

Answer

Anthracosis

Answer

Byssinosis

Answer

Bagassosis

Question 6

Kerley B lines are seen in mitral stenosis when the resting left atrial pressure exceeds which value?

Accepted Answer

20 mm Hg

Answer

10 mm Hg

Answer

30 mm Hg

Answer

40 mm Hg

Question 7

Chest x-ray of a child presenting with acute breathlessness. What is the most likely diagnosis?

Accepted Answer

Pneumothorax

Answer

Normal

Answer

Pneumatocele

Answer

Pleural effusion

Question 8

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

Accepted Answer

Bronchiectatic features

Answer

Reticular opacities

Answer

Honeycombing

Answer

Ground glass opacities

Question 9

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

Accepted Answer

Boot-shaped heart

Answer

Elevated left main bronchus

Answer

Splaying of carina

Answer

Enlargement of left atrial appendage

Question 10

Which of the following statements about HRCT (High Resolution Computed Tomography) is false?

Accepted Answer

Cannot provide detailed imaging of lung tissues

Answer

Investigation of choice for interstitial lung disease

Answer

Has narrow beam collimation

Answer

Uses thin slice thickness

Chest Radiology — MCQs

Chest Radiology — MCQs

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