Chest Radiology — MCQs

Chest Radiology Indian Medical PG Practice Questions and MCQs

Question 431: CT chest shows 'signet ring sign' with dilated bronchus and adjacent pulmonary artery. Which of these is LEAST likely?

A. ABPA
B. Sarcoidosis (Correct Answer)
C. Bronchiectasis
D. Cystic fibrosis

Explanation: ***Sarcoidosis*** - While sarcoidosis can cause various pulmonary manifestations, **bronchiectasis with a "signet ring sign" is not a typical or primary feature**. It primarily causes **non-caseating granulomas**, often leading to lymphadenopathy and interstitial lung disease. - The disease's characteristic features are usually **hilar and mediastinal lymphadenopathy** and **pulmonary nodules or fibrosis**, not dilated bronchi. *ABPA* - **Allergic bronchopulmonary aspergillosis (ABPA)** commonly causes **bronchial obstruction and subsequent dilation**, leading to bronchiectasis that can manifest as a "signet ring sign" on CT. - It often involves **central bronchiectasis** with mucoid impaction, which is a key imaging finding in this condition. *Bronchiectasis* - **Bronchiectasis** is fundamentally defined by **permanent dilation of the bronchi**, which appears as a "signet ring sign" when a dilated bronchus is seen adjacent to a smaller accompanying pulmonary artery. - This finding is a **hallmark imaging feature** for diagnosing bronchiectasis, regardless of its underlying cause. *Cystic fibrosis* - **Cystic fibrosis** is a genetic disorder leading to thick, sticky mucus that obstructs airways and predisposes to recurrent infections, inevitably causing **widespread bronchiectasis**. - The **"signet ring sign" is a very common finding** in CT scans of patients with cystic fibrosis due to extensive bronchial dilation.

Question 432: Best imaging modality for acute pulmonary embolism

A. V/Q scan
B. CT pulmonary angiogram (Correct Answer)
C. Chest X-ray
D. MRI

Explanation: ***CT pulmonary angiogram*** - This is the **gold standard** imaging modality for diagnosing acute pulmonary embolism due to its high sensitivity and specificity in visualizing pulmonary arteries. - It rapidly provides detailed images of the pulmonary vasculature, allowing for direct visualization of **thrombi**. *V/Q scan* - A **V/Q scan** measures ventilation and perfusion of the lungs and is less definitive than CTPA, especially in patients with pre-existing lung disease. - It is often considered when **CTPA is contraindicated**, such as in cases of severe renal impairment or contrast allergy. *Chest X-ray* - A **chest X-ray** is generally used to rule out other causes of chest pain and shortness of breath, such as pneumonia or pneumothorax, rather than to diagnose PE directly. - It has **low sensitivity and specificity** for pulmonary embolism, as findings are often non-specific or normal even in the presence of PE. *MRI* - **Magnetic resonance angiography (MRA)** can be used, but it is typically reserved for patients who cannot undergo CTPA or V/Q scan due to contraindications like **pregnancy** or **renal failure**. - It often takes longer to perform and has lower spatial resolution compared to CTPA for pulmonary artery visualization.

Question 433: Which sign on chest X-ray indicates tension pneumothorax?

A. Mediastinal shift (Correct Answer)
B. Flattened diaphragm
C. Deep sulcus sign
D. All of the options

Explanation: ***Mediastinal shift*** - **Mediastinal shift** away from the affected side is the **most specific and critical radiographic sign** of tension pneumothorax on chest X-ray. - The progressive air accumulation under positive pressure pushes the **mediastinum** (heart, great vessels, trachea) toward the contralateral side, causing life-threatening **cardiorespiratory compromise** by impeding venous return and cardiac output. - This finding distinguishes tension pneumothorax from simple pneumothorax and mandates **immediate needle decompression**. *Flattened diaphragm* - A **flattened or depressed hemidiaphragm** can occur in tension pneumothorax due to increased intrapleural pressure pushing the diaphragm downward. - However, this sign is **non-specific** as it also occurs in simple pneumothorax, hyperinflation, COPD, and other conditions. - While supportive, it does not definitively indicate the high-pressure tension state. *Deep sulcus sign* - The **deep sulcus sign** (abnormally deep and lucent costophrenic angle) is seen on **supine chest X-rays** when air accumulates anteriorly and inferiorly in the pleural space. - This indicates pneumothorax but is **not specific for tension pneumothorax** and can be seen in simple pneumothorax. - It is position-dependent and does not indicate mediastinal compression. *All of the options* - While flattened diaphragm and deep sulcus sign **may be present** in tension pneumothorax, only **mediastinal shift** is the **definitive radiographic indicator** that distinguishes tension from simple pneumothorax. - Mediastinal shift is the key finding that reflects the pathophysiological pressure differential causing cardiovascular compromise.

Question 434: A 50-year-old male with hemoptysis shows cavitary lesion with air-crescent sign. Most likely diagnosis?

A. Tuberculosis
B. Aspergilloma (Correct Answer)
C. Granulomatosis with polyangiitis (GPA)
D. Lung abscess

Explanation: ***Aspergilloma*** - The presence of a **cavitary lesion** with an **air-crescent sign** (Monod sign) in a patient with hemoptysis is highly characteristic of an aspergilloma, which is a fungal ball growing within a pre-existing lung cavity. - **Hemoptysis** is a common symptom due to the erosion of vessels by the fungal ball or inflammation. *Tuberculosis* - While **cavitary lesions** can be seen in tuberculosis, the **air-crescent sign** is not typical and hemoptysis in TB is usually related to active infection or rupture of an aneurysm (Rasmussen's aneurysm). - Tuberculosis would typically show other features like **consolidation**, **lymphadenopathy**, or **miliary opacities** depending on the stage. *Granulomatosis with polyangiitis (GPA)* - GPA can cause **cavitary lung lesions** and **hemoptysis** due to parenchymal vasculitis. - However, it does not typically present with the definitive **air-crescent sign** seen with aspergilloma. GPA would also show signs of **renal involvement** and **upper airway disease**. *Lung abscess* - A lung abscess is a **pus-filled cavity** in the lung often caused by bacterial infection, appearing as a cavitary lesion in imaging. - While it can cause hemoptysis, the **air-crescent sign** is not a characteristic feature; instead, it typically shows a **thick, irregular wall** with an air-fluid level.

Question 435: Which finding best indicates poor prognosis in interstitial lung disease?

A. Honeycombing on HRCT (Correct Answer)
B. Ground glass opacity
C. Restrictive PFT pattern
D. Clubbing

Explanation: ***Honeycombing on HRCT*** - **Honeycombing** on High-Resolution Computed Tomography (HRCT) indicates **irreversible fibrosis and architectural distortion** of the lung parenchyma, representing end-stage lung disease. - Its presence is a strong predictor of **worse prognosis and increased mortality** in various interstitial lung diseases, particularly **idiopathic pulmonary fibrosis (IPF)**. *Ground glass opacity* - **Ground glass opacity (GGO)** represents inflammation and early fibrosis, which can be **reversible** with treatment in some interstitial lung diseases. - While GGO indicates lung involvement, it does not necessarily signify irreversible damage or poor prognosis as definitively as honeycombing. *Restrictive PFT pattern* - A **restrictive pattern on pulmonary function tests (PFTs)** (reduced total lung capacity and vital capacity) is characteristic of all interstitial lung diseases. - While indicative of the disease, it is a **diagnostic hallmark rather than a specific prognostic indicator** for the severity of fibrosis or future outcome. *Clubbing* - **Clubbing** (thickening of the distal phalanges) is a common sign in many chronic lung diseases, including interstitial lung disease. - While its presence suggests chronic oxygen deprivation, it is a **non-specific finding** and does not directly correlate with disease progression or prognosis as strongly as imaging findings like honeycombing.

Question 436: Which finding is NOT associated with pulmonary embolism on CT angiography?

A. Filling defects
B. Hampton's hump (Correct Answer)
C. Enlarged pulmonary artery
D. Oligemia

Explanation: ***Hampton's hump*** - **Hampton's hump** is a **peripheral wedge-shaped opacity** representing **pulmonary infarction**, classically described as a **chest X-ray finding**, not a primary CT angiography (CTA) finding. - While the parenchymal opacity from infarction can be visualized on CT, it is **not what CTA is designed to detect**—CTA primarily visualizes the **pulmonary vasculature and intraluminal thrombi**. - Hampton's hump reflects a **consequence** of PE (tissue infarction) rather than the embolus itself, making it **NOT directly associated with PE on CTA**. *Filling defects* - **Filling defects** represent **intraluminal thrombus** within contrast-filled pulmonary arteries. - This is the **hallmark and primary diagnostic sign** of pulmonary embolism on CT angiography. - CTA is specifically performed to visualize these vascular abnormalities. *Enlarged pulmonary artery* - An **enlarged main pulmonary artery** (>29 mm) is a **secondary finding** on CTA that suggests **pulmonary hypertension**. - This can result from acute massive PE or chronic thromboembolic disease. - It is readily visualized and measured on CTA as part of PE assessment. *Oligemia* - **Oligemia (Westermark sign)** refers to **regional decreased vascularity** distal to a significant pulmonary artery obstruction. - While classically a **chest X-ray finding**, decreased vessel caliber and perfusion changes **can be appreciated on CTA**. - Unlike Hampton's hump (a parenchymal consequence), oligemia reflects the **vascular effect** of the obstruction and is thus more directly related to CTA findings.

Question 437: What does the 'Kerley B lines' appearance on a chest X-ray indicate?

A. Pulmonary fibrosis
B. Pulmonary edema (Correct Answer)
C. Pneumonia
D. Pleural effusion

Explanation: ***Pulmonary edema*** - **Kerley B lines** are thin, horizontal lines located peripherally in the lung fields on a chest X-ray, typically indicating the presence of **interstitial pulmonary edema**. - They represent **edematous interlobular septa** thickened by fluid, often seen in conditions like **congestive heart failure**. *Pulmonary fibrosis* - Characterized by **reticular opacities**, **honeycombing**, and **traction bronchiectasis** on a chest X-ray, which are distinct from Kerley B lines. - While both involve the interstitium, pulmonary fibrosis represents **irreversible scarring**, not acute fluid accumulation. *Pneumonia* - Typically presents as **lobar or patchy consolidation** (airspace opacities) on a chest X-ray, sometimes with air bronchograms, rather than thin linear opacities. - This condition involves inflammation and infection within the **alveoli**, leading to exudate. *Pleural effusion* - Appears as a **blunting of the costophrenic angles** and a **meniscus sign** (curvilinear shadow) on a chest X-ray, indicating fluid in the pleural space. - This is distinct from Kerley B lines, which are found within the lung parenchyma rather than the pleural space.

Question 438: What is the hallmark sign of acute respiratory distress syndrome (ARDS) on a chest X-ray?

A. Consolidation (Correct Answer)
B. Ground-glass opacity
C. Honeycombing
D. Pleural effusion

Explanation: ***Consolidation (Bilateral diffuse airspace opacities)*** - **Bilateral diffuse airspace opacities** (alveolar infiltrates/consolidation) are the hallmark findings of ARDS on chest X-ray, as defined by the Berlin criteria. - These opacities represent **alveolar flooding** due to increased capillary permeability and typically appear within 1 week of a known clinical insult. - The distribution is typically **bilateral and relatively symmetric**, not fully explained by effusions, lobar/lung collapse, or nodules. - Chest X-ray shows these as patchy or diffuse areas of increased opacity that can progress to more dense consolidation. *Ground-glass opacity* - **Ground-glass opacity** is primarily a **CT scan finding**, not reliably visible on plain chest X-rays. - This term describes increased attenuation with preserved bronchial and vascular markings, which requires the resolution of CT imaging to appreciate. - While present in ARDS on CT scans, it is not the hallmark feature on chest X-ray specifically. *Honeycombing* - **Honeycombing** refers to clustered cystic airspaces indicating **end-stage pulmonary fibrosis**. - This is a chronic finding seen in interstitial lung diseases, not in acute ARDS. - It represents irreversible architectural distortion from longstanding fibrosis. *Pleural effusion* - **Pleural effusion** may occur with ARDS but is not a defining or hallmark radiographic feature. - Small effusions can be present, but large effusions should prompt consideration of alternative diagnoses like heart failure. - The Berlin definition emphasizes that opacities should not be fully explained by effusions.

Question 439: A patient presents with difficulty breathing and a tracheal deviation to the left. A chest X-ray reveals a right-sided pneumothorax. Which structure is most likely affected?

A. Right lung (Correct Answer)
B. Mediastinum
C. Diaphragm
D. Left lung

Explanation: ***Right lung*** - A **right-sided pneumothorax** indicates air accumulation in the pleural space surrounding the right lung, causing it to collapse and leading to difficulty breathing. - The **tracheal deviation to the left** is a classic sign of a **tension pneumothorax** on the right, where the increased pressure pushes the mediastinum (and thus the trachea) away from the affected side. *Mediastinum* - While the mediastinum is *displaced* by a tension pneumothorax, it is not the primary structure *affected* in terms of the underlying pathology. - The mediastinum is a consequence of the pressure imbalance, not the initial site of the problem. *Diaphragm* - The diaphragm may be depressed on the affected side in a large pneumothorax, but it is not the primary structure affected by the air accumulation. - Diaphragmatic issues typically involve breathing mechanics or pathology within the diaphragm itself, not a primary pneumothorax. *Left lung* - The patient has a **right-sided pneumothorax**, meaning the pathology originates in the right pleural space and affects the right lung. - The left lung is not directly affected by the pneumothorax, although its function may be compromised due to mediastinal shift.

Question 440: What is the most common finding on a chest X-ray in a patient with congestive heart failure?

A. Pleural effusion
B. Cardiomegaly (Correct Answer)
C. Kerley B lines
D. Pulmonary edema

Explanation: ***Cardiomegaly*** - **Cardiomegaly**, evidenced by an increased **cardiothoracic ratio** on a chest X-ray, is a common and early indicator of chronic volume overload or structural heart disease, frequently seen in **congestive heart failure**. - It reflects ventricular dilation or hypertrophy, which are compensatory mechanisms that eventually fail in heart failure. *Pleural effusion* - While common in heart failure, **pleural effusions** usually represent a more advanced stage of fluid retention and are not the absolute most common initial or sole finding. - They occur due to increased hydrostatic pressure in the pleural capillaries, leading to fluid transudation. *Kerley B lines* - **Kerley B lines** are signs of **interstitial pulmonary edema**, indicating fluid accumulation in the lung interstitium. - While present in heart failure, particularly as the condition worsens, they are a specific sign and not as globally common as cardiomegaly, which can be seen even in early stages. *Pulmonary edema* - **Pulmonary edema** refers to fluid in the alveolar spaces, appearing as fluffy infiltrates on a chest X-ray. It signifies acute or severe decompensated heart failure. - Although highly characteristic of acute heart failure exacerbations, it is not consistently the most common finding across all stages of heart failure, especially in stable or mild cases where cardiomegaly might be the only radiological sign.

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

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