Chest Radiology Practice Questions

Q: What is the most common view used for a chest X-ray?

PA view. **PA view** - The **posteroanterior (PA) view** is the most common and preferred projection for routine chest X-rays. - This view minimizes **cardiac magnification** and provides a clearer demonstration of lung fields and pulmonary vasculature. *AP view* - The **anteroposterior (AP) view** is typically used for patients who are unable to stand, such as those who are bedridden or critically ill. - It causes **magnification of the heart shadow** and often results in poorer image quality due to the shorter source-to-image receptor distance. *Lateral view* - A **lateral view** is commonly performed in addition to the PA view to provide a three-dimensional perspective and help localize abnormalities. - It is not usually taken as the sole or primary projection for a general chest X-ray. *Oblique view* - **Oblique views** are specialized projections used to visualize specific areas of the chest more clearly, often to differentiate structures or investigate findings seen on standard PA or lateral views. - They are not considered a standard or routine view for initial chest imaging.

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).

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: 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: Round pneumonia is seen with

Streptococcus pneumoniae. ***Streptococcus pneumoniae*** - **Round pneumonia**, a well-defined spherical opacification on chest radiography, is a characteristic presentation of pneumonia caused by ***Streptococcus pneumoniae***, particularly in children. - The organism's ability to incite a rapid, localized inflammatory response can lead to the formation of this focal, rounded consolidation. *Kerosene oil aspiration pneumonia* - Kerosene oil aspiration typically causes a **diffuse, bilateral pneumonitis** with chemical irritation, not a well-circumscribed round lesion. - The radiographic pattern is usually one of prominent **ground-glass opacities** and consolidations, often in the lower lobes. *Mendelson syndrome pneumonia* - Mendelson syndrome, or **aspiration pneumonitis**, involves chemical lung injury from aspirating gastric contents, leading to **diffuse inflammation** and edema. - It typically presents as **patchy or diffuse infiltrates**, often bilateral and basilar, rather than a solitary round infiltrate. *Lung cancer* - While lung cancer can present as a **round mass** or nodule, it is a neoplastic process, not an infectious pneumonia. - A distinguishing feature is that lung cancer masses typically show **growth over time** and may have irregular margins or spiculation, unlike the acute inflammatory nature of round pneumonia.

Q: Finger-in-glove sign is seen in

Bronchocele. ***Bronchocele*** - The **finger-in-glove sign** is a characteristic radiological finding that represents **mucoid impaction** – a **bronchus distended with mucus**, appearing as branching, finger-like opacities. - **Bronchocele** refers to this mucus-filled, dilated bronchus caused by bronchial obstruction. - The **most common cause** of the finger-in-glove sign is **allergic bronchopulmonary aspergillosis (ABPA)**, though it can also be seen in bronchial atresia, asthma with mucus plugging, and other causes of bronchial obstruction with mucostasis. *Pulmonary alveolar proteinosis* - This condition is characterized by the accumulation of **lipoproteinaceous material within the alveoli**, not the bronchi. - Radiologically, it often presents as **diffuse ground-glass opacities** and **interlobular septal thickening**, known as a "crazy-paving" pattern, which is distinct from the finger-in-glove sign. *Pneumocystis jirovecii* - **Pneumocystis pneumonia (PCP)** typically affects immunocompromised individuals and is characterized by a diffuse **interstitial pneumonia**. - Radiological features include diffuse **ground-glass opacities**, reticular patterns, and sometimes cysts, but not the mucinous impaction seen in the finger-in-glove sign. *Tuberculosis* - Tuberculosis can manifest in various forms, including **cavitary lesions**, **nodules**, consolidation, and **pleural effusions**. - While it can cause bronchial narrowing, it does not typically lead to the distinct finger-in-glove appearance caused by mucoid impaction within dilated bronchi.

Q: Based on the provided chest X-ray image of a patient presenting with low-grade fever, which infection is most likely?

Miliary Tuberculosis. ***Miliary Tuberculosis*** - The chest X-ray shows diffuse, fine, granular infiltrates, often described as a **"millet seed" pattern**, which is highly characteristic of **miliary tuberculosis**. - This pattern represents widespread hematogenous dissemination of *Mycobacterium tuberculosis* and is consistent with systemic symptoms like **low-grade fever**. - The **uniform distribution** of 1-3 mm nodules throughout both lung fields is pathognomonic for miliary TB. *Lobar Pneumonia* - **Lobar pneumonia** appears as a homogenous opacification of a lung segment or entire lobe, often with obscuration of vascular markings and sometimes with **air bronchograms**. - The image does not show a dense, localized area of consolidation, but rather a diffuse, fine nodular pattern throughout both lung fields. - Lobar pneumonia typically presents with high-grade fever and acute symptoms, not the low-grade fever described. *Interstitial Lung Disease* - While interstitial lung disease can present with widespread infiltrates, these are typically more varied, showing patterns like **reticular nodularities**, **honeycombing**, or **ground-glass opacities**. - The uniform, fine nodularity seen in the image is not typical for most forms of interstitial lung disease. - ILD is usually a chronic process, whereas miliary TB can present acutely or subacutely. *Bronchopneumonia* - **Bronchopneumonia** commonly presents as patchy, multifocal areas of consolidation or opacities that are often centered around bronchi in a **bronchocentric distribution**. - The widespread, uniform, and fine nodular pattern seen on this X-ray is distinct from the typical patchy, asymmetric appearance of bronchopneumonia. - Bronchopneumonia shows more confluent opacities rather than discrete miliary nodules.

Q: On CT chest, the 'halo sign' is particularly associated with which condition in immunocompromised patients?

Invasive pulmonary aspergillosis. ***Invasive pulmonary aspergillosis*** - The **halo sign** on CT chest, characterized by a ground-glass opacity surrounding a nodule, is a classic radiographic finding in **invasive pulmonary aspergillosis**, especially in immunocompromised patients. - This sign represents hemorrhage around the fungal nodule and indicates active tissue invasion by *Aspergillus* species. *Pulmonary hydatid cyst* - Hydatid cysts are typically well-defined, thin-walled cystic lesions, often displaying the **water lily sign** if complicated by rupture, which is different from the halo sign. - These cysts are caused by the larval stage of *Echinococcus granulosus* and are not associated with a peripheral ground-glass opacity. *Round pneumonia* - Round pneumonia is a localized, **spherical consolidation** often seen in children, which does not typically exhibit the perilesional ground-glass opacity characteristic of the halo sign. - It usually represents bacterial infection and resolves with antibiotics, unlike the invasive fungal disease suggested by the halo sign. *Bronchiectasis* - Bronchiectasis is characterized by **irreversible dilation of the bronchi**, often appearing as "tram-track" opacities or "signet ring" signs on CT. - It is a chronic condition related to airway damage and mucus retention, and not associated with acute nodular lesions or the halo sign.

Q: Which condition is characterized by a specific appearance on CT scans that resembles small centrilobular nodules with branching linear structures?

Pulmonary tuberculosis. ***Pulmonary tuberculosis*** - This description ("small centrilobular nodules with **branching linear structures**") is characteristic of the **tree-in-bud pattern** seen on CT scans, which is a hallmark finding in active **endobronchial spread of tuberculosis**. - The tree-in-bud pattern results from the impaction of tuberculous **granulomas** and caseous material in the terminal and respiratory bronchioles. *Silicosis* - Characterized by multiple small, well-defined **nodules** (often in the upper lobes) that tend to calcify, but typically lacks the fine **branching linear structures**. - It’s associated with occupational exposure to **silica dust** and may progress to **massive progressive fibrosis**. *Pulmonary hydatid cyst* - Presents as a well-defined, usually **single, large cystic lesion** on CT, often with internal membranes if ruptured (water lily sign or crumpled membrane sign). - It does not typically manifest with small centrilobular nodules or branching linear structures. *Small cell carcinoma* - Usually appears as a **large central mass**, often with mediastinal lymphadenopathy, and sometimes associated with obstructive pneumonitis. - It does not typically present as diffuse small centrilobular nodules with branching patterns.

Q: Which view is best for visualizing the collapse of the middle lobe of the lung?

Lateral. ***Lateral*** - A **lateral chest X-ray** is crucial for localizing abnormalities to specific lung lobes because it allows for a clear visualization of the **fissures** which define the lung lobes. - Collapse of the right middle lobe is particularly well-visualized on a lateral view as a **triangular opacity** that points towards the hilum, often obliterating the right heart border. *Anteroposterior (AP)* - While an AP or PA view can show collapse, it often appears as a **non-specific wedge or triangular opacity** and struggles with precise lobar localization due to superimposed structures. - The **heart shadow and mediastinum** can obscure parts of the middle lobe, making definitive diagnosis challenging from this view alone. *Oblique* - Oblique views are typically used for specific purposes, such as evaluating the **pleura** or **ribs**, and are not a standard view for initial assessment of lobar collapse. - They introduce **distortion and superimposition** that can make the identification and characterization of lobar collapse more difficult than a standard lateral projection. *Lordotic* - A lordotic view is primarily used to visualize the **lung apices** and to differentiate apical lesions from superimposed clavicular shadows. - It is not effective for visualizing the middle lobe, which is located more inferiorly, and would introduce significant distortion, making assessment of its collapse unreliable.

Question 1

What is the most common view used for a chest X-ray?

Accepted Answer

PA view

Answer

AP view

Answer

Lateral view

Answer

Oblique view

Question 2

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

Question 3

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 4

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 5

Round pneumonia is seen with

Accepted Answer

Streptococcus pneumoniae

Answer

Kerosene oil aspiration pneumonia

Answer

Mendelson syndrome pneumonia

Answer

Lung cancer

Question 6

Finger-in-glove sign is seen in

Accepted Answer

Bronchocele

Answer

Tuberculosis

Answer

Pulmonary alveolar proteinosis

Answer

Pneumocystis jirovecii

Question 7

Based on the provided chest X-ray image of a patient presenting with low-grade fever, which infection is most likely?

Accepted Answer

Miliary Tuberculosis

Answer

Lobar Pneumonia

Answer

Interstitial Lung Disease

Answer

Bronchopneumonia

Question 8

On CT chest, the 'halo sign' is particularly associated with which condition in immunocompromised patients?

Accepted Answer

Invasive pulmonary aspergillosis

Answer

Pulmonary hydatid cyst

Answer

Round pneumonia

Answer

Bronchiectasis

Question 9

Which condition is characterized by a specific appearance on CT scans that resembles small centrilobular nodules with branching linear structures?

Accepted Answer

Pulmonary tuberculosis

Answer

Silicosis

Answer

Pulmonary hydatid cyst

Answer

Small cell carcinoma

Question 10

Which view is best for visualizing the collapse of the middle lobe of the lung?

Accepted Answer

Lateral

Answer

Anteroposterior (AP)

Answer

Oblique

Answer

Lordotic

Chest Radiology — MCQs

Chest Radiology — MCQs

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