Chest Radiology — MCQs

Chest Radiology Indian Medical PG Practice Questions and MCQs

Question 451: What is the investigation of choice for a Pancoast tumor?

A. MRI (Correct Answer)
B. HRCT
C. CECT
D. Bronchography

Explanation: ***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 *Bronchography* - **Bronchography** is an outdated and invasive procedure that involves injecting contrast into the tracheobronchial tree to visualize the airways.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.

Question 452: 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 453: Which of the following statements about HRCT (High Resolution Computed Tomography) is false?

A. Investigation of choice for interstitial lung disease
B. Cannot provide detailed imaging of lung tissues (Correct Answer)
C. Has narrow beam collimation
D. Uses thin slice thickness

Explanation: ***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 454: Round pneumonia is seen with

A. Streptococcus pneumoniae (Correct Answer)
B. Kerosene oil aspiration pneumonia
C. Mendelson syndrome pneumonia
D. Lung cancer

Explanation: ***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.

Question 455: Finger-in-glove sign is seen in

A. Bronchocele (Correct Answer)
B. Tuberculosis
C. Pulmonary alveolar proteinosis
D. Pneumocystis jirovecii

Explanation: ***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.

Question 456: Based on the provided chest X-ray image of a patient presenting with low-grade fever, which infection is most likely?

A. Miliary Tuberculosis (Correct Answer)
B. Lobar Pneumonia
C. Interstitial Lung Disease
D. Bronchopneumonia

Explanation: ***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.

Question 457: On CT chest, the 'halo sign' is particularly associated with which condition in immunocompromised patients?

A. Pulmonary hydatid cyst
B. Round pneumonia
C. Bronchiectasis
D. Invasive pulmonary aspergillosis (Correct Answer)

Explanation: ***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.

Question 458: A 55-year-old hypertensive patient presents with severe chest pain radiating to the back. What does a CT scan of the thorax typically reveal?

A. Type A Aortic dissection
B. Type B Aortic dissection (Correct Answer)
C. Pulmonary Embolism
D. Thoracic Aortic Aneurysm

Explanation: ***Type B Aortic dissection*** - A CT scan of the thorax would show a **tear in the descending aorta**, typically distal to the left subclavian artery, consistent with a type B dissection. - The combination of **hypertension** and **severe chest pain radiating to the back** is highly suggestive of an aortic dissection, and involvement of the descending aorta (Type B) often presents with radiating back pain. *Type A Aortic dissection* - A type A dissection involves the **ascending aorta**, which would typically present with chest pain radiating to the neck or jaw, or acute onset of symptoms suggestive of a stroke or myocardial infarction. - While it's also an aortic dissection, its location is different, and the pain typically radiates to different areas. *Pulmonary Embolism* - A **pulmonary embolism** would appear as a filling defect in the pulmonary arteries on a CT angiogram, not a tear in the aorta. - Though it can cause chest pain, it's typically pleuritic and not usually described as severe and radiating to the back in the same manner as an aortic dissection. *Thoracic Aortic Aneurysm* - A **thoracic aortic aneurysm** is a localized dilation of the aorta, not a tear, and it typically presents with chronic or less acute symptoms unless it ruptures or causes compression. - While an aneurysm can be present, the acute and severe nature of the pain described points more strongly to an acute event like dissection rather than a stable aneurysm.

Question 459: Identify the condition represented in the image.

A. Miliary tuberculosis (Correct Answer)
B. Bronchiectasis
C. COPD
D. Lung cancer

Explanation: ***Miliary tuberculosis*** - The image displays lungs riddled with numerous small (1-5 mm), uniform **granulomas**, resembling millet seeds, which is characteristic of **miliary tuberculosis**. - This pattern results from the **hematogenous dissemination** of **Mycobacterium tuberculosis** throughout the body, including the lungs. *Bronchiectasis* - Bronchiectasis is characterized by **irreversible dilation of bronchi** with chronic inflammation and infection, which would appear as dilated airways and associated scarring on gross pathology, not diffuse small nodules. - While it can be a complication of tuberculosis, the primary gross feature in the image is not dilated bronchi. *COPD* - Chronic Obstructive Pulmonary Disease (COPD) typically manifests as **emphysema** (enlarged airspaces with destruction of alveolar walls) or **chronic bronchitis** (mucus gland hypertrophy and inflammation of airways). - These conditions would present with large areas of destroyed lung tissue, mucous plugging, or thickened bronchial walls, which are distinctly different from the numerous small nodules seen in the image. *Lung cancer* - Lung cancer usually presents as a **mass or nodule**, which can be solitary or multiple, but typically larger and more irregular than the uniform small nodules in this image. - While metastatic lung cancer can present with multiple nodules, the uniform size and diffuse distribution seen here are far more typical of miliary spread of an infection.

Question 460: Which condition is characterized by a specific appearance on CT scans that resembles small centrilobular nodules with branching linear structures?

A. Pulmonary tuberculosis (Correct Answer)
B. Silicosis
C. Pulmonary hydatid cyst
D. Small cell carcinoma

Explanation: ***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.

Practice by Chapter

Normal Chest Radiographic Anatomy

Practice Questions

Radiographic Signs in Chest Imaging

Practice Questions

Pulmonary Infections

Practice Questions

Chronic Obstructive Pulmonary Disease

Practice Questions

Interstitial Lung Diseases

Practice Questions

Pulmonary Neoplasms

Practice Questions

Pleural Diseases

Practice Questions

Mediastinal Pathology

Practice Questions

Congenital and Developmental Chest Anomalies

Practice Questions

Pulmonary Vascular Diseases

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Chest Trauma Imaging

Practice Questions

Post-Surgical Chest Imaging

Practice Questions

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