Chest Radiology Practice Questions

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: 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: What is the investigation of choice for a Pancoast tumor?

MRI. ***MRI*** - **Magnetic Resonance Imaging (MRI)** is the investigation of choice for a Pancoast tumor due to its superior ability to visualize **soft tissue invasion** of structures in the **thoracic inlet**, such as the brachial plexus, subclavian vessels, and vertebral bodies. - This detailed assessment of local invasion is crucial for **surgical planning** and determining resectability. *HRCT* - **High-Resolution Computed Tomography (HRCT)** is primarily used for evaluating **diffuse parenchymal lung diseases** and provides detailed imaging of lung architecture, not for tumor staging. - It is not optimal for assessing **soft tissue extension** into the surrounding structures of the thoracic inlet, which is characteristic of a Pancoast tumor. *CECT* - **Contrast-Enhanced Computed Tomography (CECT)** is excellent for identifying the presence of a lung mass and evaluating its relationship to adjacent structures, as well as for **mediastinal lymph node staging** and detecting distant metastases. - While useful, its ability to precisely delineate **neural and vascular invasion** in the thoracic inlet is inferior to MRI. *Bronchography* - **Bronchography** is an outdated and invasive procedure that involves injecting contrast into the tracheobronchial tree to visualize the airways. - It has been largely replaced by CT and bronchoscopy and is not used for the diagnosis or staging of lung tumors like a Pancoast tumor.

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

Ruptured Hydatid Cyst. ***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.

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: Air bronchogram on chest X-ray denotes -

Intrapulmonary lesion. ***Intrapulmonary lesion*** - An **air bronchogram** indicates that the air-filled bronchi are surrounded by consolidated or fluid-filled alveoli, making the bronchi visible against the opacified lung parenchyma. - This pattern is a strong sign of a process **within the lung tissue itself**, such as pneumonia, pulmonary edema, or malignancy. *Extrapulmonary lesion* - **Extrapulmonary lesions**, such as pleural effusions or masses originating from the chest wall, typically displace or compress the lung and bronchi, rather than filling the alveoli around them. - They usually do **not produce an air bronchogram** because the air in the bronchi is not juxtaposed against diseased lung parenchyma. *Intrathoracic lesion* - This is a broad term that includes all lesions within the thoracic cavity, both intrapulmonary and extrapulmonary. - While an air bronchogram is an intrathoracic finding, it specifically points to an **intrapulmonary process**, not just any intrathoracic lesion. *Extrathoracic lesion* - **Extrathoracic lesions** are located outside the chest cavity and would not manifest as an air bronchogram on a chest X-ray. - This option is **completely unrelated** to the interpretation of an air bronchogram.

Question 1

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 2

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 3

What is the investigation of choice for a Pancoast tumor?

Accepted Answer

MRI

Answer

HRCT

Answer

CECT

Answer

Bronchography

Question 4

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

Accepted Answer

Ruptured Hydatid Cyst

Answer

Pulmonary Aspergillosis

Answer

Pulmonary Hamartoma

Answer

Cavitating Lung Metastasis

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

Air bronchogram on chest X-ray denotes -

Accepted Answer

Intrapulmonary lesion

Answer

Extrapulmonary lesion

Answer

Intrathoracic lesion

Answer

Extrathoracic lesion

Chest Radiology — MCQs

Chest Radiology — MCQs

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