Chest Radiology Practice Questions

Q: What is the best investigation for diagnosing minimal right pleural effusion?

Ultrasound (USG). **Explanation:** The diagnosis of pleural effusion depends on the sensitivity of the imaging modality to detect small volumes of fluid. **Ultrasound (USG)** is the correct answer because it is highly sensitive and can detect as little as **5–20 mL** of pleural fluid. It is superior to conventional radiography for identifying minimal effusions, differentiating fluid from pleural thickening, and identifying loculations. **Analysis of Options:** * **A & D (Lateral Decubitus X-ray):** While more sensitive than an upright PA view (which requires ~200 mL to show costophrenic angle blunting), a lateral decubitus film still requires approximately **25–50 mL** of fluid to be visible. For a right-sided effusion, a **Right** lateral decubitus view is used (fluid layers down). * **B (CT Scan):** CT is the "gold standard" for characterizing pleural anatomy and can detect very small amounts of fluid (~10 mL). However, it is not considered the "best" initial investigation due to high radiation dose, cost, and lack of portability compared to USG. **High-Yield Pearls for NEET-PG:** 1. **Sensitivity Thresholds:** * **USG:** 5–20 mL (Most sensitive bedside tool). * **Lateral Decubitus X-ray:** 25–50 mL. * **Upright PA X-ray:** 175–200 mL (blunting of costophrenic angle). * **Lateral X-ray (Upright):** 75 mL (blunting of posterior costophrenic sulcus). 2. **USG Sign:** The "Quad sign" and "Sinusoid sign" are classic sonographic findings of pleural effusion. 3. **Clinical Utility:** USG is the investigation of choice for **guiding thoracocentesis**, significantly reducing the risk of iatrogenic pneumothorax.

Q: A chest X-ray shows Hilar vascular markings, Kerley B lines, and a hazy left lung field. What is the most likely diagnosis?

Mild congestive heart failure. ### Explanation The correct answer is **Mild congestive heart failure (CHF)**. This diagnosis is based on the classic radiological progression of pulmonary edema, which occurs in stages as pulmonary capillary wedge pressure (PCWP) rises. **1. Why Mild CHF is correct:** The findings described represent **Interstitial Edema** (Stage II of CHF): * **Hilar vascular markings:** Increased prominence of pulmonary vessels due to venous congestion. * **Kerley B lines:** Short, horizontal lines (1–2 cm) at the lung bases/periphery, representing thickened interlobular septa due to fluid accumulation. * **Hazy lung field:** Represents early alveolar fluid or interstitial thickening (ground-glass appearance). * *Note:* In NEET-PG, "Mild CHF" often refers to this interstitial stage before frank alveolar "bat-wing" edema occurs. **2. Why other options are incorrect:** * **Pleural effusion:** While often associated with CHF, it typically presents as a dense, homogenous opacity with a **concave upper border (Meniscus sign)** and obliteration of the costophrenic angle, rather than diffuse Kerley B lines. * **Bronchiectasis:** Characterized by "Tram-track" opacities (thickened bronchial walls) and "Signet ring" signs on CT, usually associated with chronic cough and foul sputum. * **Emphysema:** Presents with **hyperlucency** (darker lungs), flattened diaphragms, and a "sabre-sheath" heart, which is the opposite of the increased vascular markings seen here. **3. High-Yield Clinical Pearls for NEET-PG:** * **Cephalization (Antler Sign):** Redistribution of blood to the upper lobes (Stage I CHF, PCWP 13–18 mmHg). * **Kerley B lines:** Pathognomonic for interstitial edema (Stage II CHF, PCWP 18–25 mmHg). * **Bat-wing appearance:** Perihilar opacities seen in alveolar edema (Stage III CHF, PCWP >25 mmHg). * **Heart Size:** A Cardiothoracic (CT) ratio >0.5 on a PA view is the most common finding in CHF.

Q: A patient presents with chronic productive cough and clubbing, with coarse rales on auscultation. What is the diagnosis suggested by the CT scan shown?

Bilateral varicose bronchiectasis. ***Bilateral varicose bronchiectasis*** - The clinical triad of **chronic productive cough**, **digital clubbing**, and **coarse rales** is pathognomonic for bronchiectasis, with varicose type showing characteristic **beaded/irregular dilations** on CT. - CT demonstrates the **signet-ring sign** (dilated bronchi larger than adjacent vessels) and **bronchial wall thickening**, confirming irreversible airway dilatation. *Multiple cavitating secondaries* - Would present with **multiple thick-walled cavities** scattered throughout both lungs, typically in **peripheral locations**. - Associated with **weight loss**, **hemoptysis**, and a **known primary malignancy** (commonly lung, kidney, or head & neck cancers). *Interstitial fibrosis* - Characterized by **fine inspiratory crackles** rather than coarse rales, with **honeycombing** and **reticular patterns** on CT. - Typically causes **restrictive lung disease** with reduced lung volumes, not the obstructive pattern seen in bronchiectasis. *Miliary tuberculosis* - Shows **diffuse small nodules** (1-3mm) with uniform distribution throughout both lung fields on CT. - Presents with **systemic symptoms** like fever, night sweats, and weight loss, often in **immunocompromised patients**.

Q: Kerley lines are typically seen in which of the following conditions?

Mitral stenosis and Interstitial edema. **Explanation:** Kerley lines are a classic radiological sign of **interstitial pulmonary edema**. They represent the thickening of the interlobular septa due to fluid accumulation, cellular infiltration, or fibrosis. **1. Why the Correct Answer is Right:** * **Interstitial Edema:** This is the direct cause of Kerley lines. When pulmonary venous pressure rises (as seen in left heart failure), fluid leaks into the interstitial spaces and interlobular septa, making them visible on a chest X-ray. * **Mitral Stenosis:** This condition leads to chronic elevation of left atrial pressure, which is transmitted backward into the pulmonary veins. This results in chronic pulmonary venous hypertension and subsequent interstitial edema, making Kerley lines a hallmark finding in advanced mitral stenosis. **2. Why Other Options are Incorrect:** * **Pleural Effusion:** While often co-occurring with heart failure, pleural effusion represents fluid in the pleural space, not the interlobular septa. It typically presents as blunting of the costophrenic angles. * **Pericardial Effusion:** This involves fluid within the pericardial sac surrounding the heart. On X-ray, it presents as a "water-bottle" heart or globular cardiomegaly, but it does not cause septal thickening in the lungs. **3. NEET-PG High-Yield Pearls:** * **Kerley A lines:** Longer (2-6 cm), unbranching lines radiating from the hila toward the central upper lobes. * **Kerley B lines:** Short (1-2 cm), horizontal lines seen at the **periphery** (costophrenic angles). These are the most common and clinically significant. * **Kerley C lines:** Short, fine lines throughout the lungs, creating a reticular appearance (least common). * **Mnemonic:** Kerley **B** lines are at the **B**ase and **B**oundary (periphery).

Q: Which of the following shows splaying of the carina in the retrocardiac shadow?

Left atrium enlargement. ### Explanation **1. Why Left Atrium Enlargement (LAE) is Correct:** The Left Atrium is the most posterior chamber of the heart, situated directly below the bifurcation of the trachea (carina). When the left atrium enlarges, it expands superiorly and posteriorly. This upward pressure pushes against the mainstem bronchi, specifically increasing the angle between the left and right main bronchi. On a frontal chest X-ray, this is visualized as **splaying of the carina** (an increase in the subcarinal angle to >90 degrees). Additionally, because the enlarged atrium projects behind the heart, it creates a "double density" sign within the **retrocardiac shadow**. **2. Analysis of Incorrect Options:** * **Left Ventricle Enlargement (LVE):** Enlarges inferiorly, posteriorly, and to the left. It causes the cardiac apex to shift downward and outward but does not impact the subcarinal angle. * **Right Atrium Enlargement (RAE):** Enlarges the right heart border toward the right lung field. It does not reach the subcarinal region. * **Right Ventricle Enlargement (RVE):** Enlarges anteriorly, filling the retrosternal clear space on a lateral view and displacing the apex upward (boot-shaped heart), but it has no effect on the carina. **3. High-Yield Clinical Pearls for NEET-PG:** * **Normal Subcarinal Angle:** Usually between 60° and 75°. An angle **>90°** is highly suggestive of LAE. * **Other X-ray signs of LAE:** * **Double Density Sign:** Overlapping of the enlarged LA shadow on the RA shadow. * **Walking Cane Sign:** Lateral displacement of the left main bronchus. * **Straightening of the left heart border:** Due to enlargement of the left atrial appendage. * **Most Common Cause:** Mitral Stenosis is the classic cause of isolated LAE leading to these radiological findings.

Q: Which of the following statements about loculated pleural effusion is false?

The opacity may show air bronchogram.. ### Explanation **1. Why Option D is the Correct (False) Statement:** An **air bronchogram** is a classic radiological sign of **parenchymal lung disease** (consolidation). It occurs when air-filled bronchi are visualized against a background of fluid-filled or collapsed alveoli. Since a loculated pleural effusion is an **extrapulmonary** collection of fluid within the pleural space, it does not contain bronchi. Therefore, it can never demonstrate an air bronchogram. Its presence definitively points toward a pulmonary process rather than a pleural one. **2. Analysis of Incorrect Options (True Statements):** * **Option A:** Pleural masses or loculated effusions typically form **obtuse angles** with the chest wall or mediastinum when viewed in profile. This is a hallmark of an extrapulmonary lesion, whereas intrapulmonary lesions usually form acute angles. * **Option B:** When viewed **enface** (perpendicular to the collection), the margins appear **unsharp or hazy** because the fluid is being viewed through its widest diameter with tapering edges. They only appear sharp when viewed in profile (tangential). * **Option C:** Unlike pneumonia or atelectasis, pleural fluid is not contained within the lung parenchyma; therefore, it **does not conform to segmental or lobar anatomy**. **3. NEET-PG High-Yield Pearls:** * **Vanishing Tumor (Pseudotumor):** A specific type of loculated pleural effusion occurring within a fissure (usually the minor fissure), often seen in congestive heart failure, which disappears with diuretic therapy. * **Differentiating Pleural vs. Lung Lesions:** * **Pleural:** Obtuse angles, displacement of lung vessels, no air bronchograms. * **Lung:** Acute angles, air bronchograms present, moves with respiration. * **Ultrasound:** The gold standard for identifying septations within a loculated effusion and guiding thoracentesis.

Q: What is the cause of posterior mediastinal opacity on a PA and lateral view of a chest X-ray?

Bochdalek's hernia. ### Explanation The mediastinum is divided into compartments, and identifying the location of a mass is crucial for differential diagnosis. **Bochdalek’s hernia** is a congenital diaphragmatic hernia resulting from the failure of the pleuroperitoneal canal to close. It is most commonly located **posterolaterally** (usually on the left side). On a chest X-ray, it appears as a soft tissue opacity or a gas-filled bowel loop in the **posterior mediastinum**, making it the correct answer. #### Analysis of Incorrect Options: * **Lymph node mass:** While lymphadenopathy is a common mediastinal mass, it typically involves the **middle mediastinum** (hilar, paratracheal, or subcarinal regions). * **Tortuous innominate artery:** This is a vascular variant that typically presents as a widening of the **superior/anterior mediastinum** on the right side, often seen in elderly or hypertensive patients. * **Aneurysm:** Most thoracic aortic aneurysms (ascending or arch) present in the **anterior or middle mediastinum**. While a descending thoracic aortic aneurysm can be posterior, Bochdalek’s hernia is a more classic "textbook" cause of a localized posterior diaphragmatic mass. #### NEET-PG High-Yield Pearls: * **Mnemonic for Hernias:** **B**ochdalek is **B**ack (Posterior) and **L**eft; **M**orgagni is **M**edial/Midline (Anterior). * **Posterior Mediastinal Masses:** Think of the "3 N's": **N**eurogenic tumors (most common), **N**enteric cysts, and **N**ode enlargement (less common than middle). * **Silhouette Sign:** If a mass obscures the heart border, it is anterior; if the heart border is visible through the mass, it is likely posterior.

Q: Which of the following is NOT a true radiographic finding in emphysema?

Decreased intercostal space. **Explanation** Emphysema is a form of Chronic Obstructive Pulmonary Disease (COPD) characterized by the permanent enlargement of air spaces distal to the terminal bronchioles and destruction of alveolar walls. This leads to **hyperinflation** of the lungs. **Why "Decreased intercostal space" is the correct answer:** In emphysema, the lungs are hyperinflated due to air trapping. This increased volume causes the ribs to move upward and outward, leading to **increased (widened) intercostal spaces**, not decreased. Decreased intercostal spaces are typically seen in conditions associated with lung volume loss, such as collapse (atelectasis) or fibrosis. **Analysis of Incorrect Options:** * **A. Low, flat diaphragm:** This is the most sensitive sign of hyperinflation. As lung volume increases, the diaphragm is pushed downward. A "tarrace" or scalloped appearance may occur due to prominent costal attachments. * **B. Tubular heart:** The hyperinflated lungs compress the mediastinum and the diaphragm descends, causing the heart to appear elongated and narrow (vertical/tubular heart). * **D. Increased radiolucence:** Destruction of the lung parenchyma and vascular bed, combined with increased air trapping, results in darker (more radiolucent) lung fields on X-ray. **NEET-PG High-Yield Pearls:** * **Sabre-sheath trachea:** A classic sign where the trachea's coronal diameter is narrowed and sagittal diameter is increased. * **Retrosternal clear space:** An increase in this space (>2.5 cm on a lateral X-ray) indicates hyperinflation. * **Bullae:** Radiolucent areas >1 cm with thin walls; their presence is a definitive sign of emphysema. * **Hoover’s Sign:** The inward movement of the lower costal margins during inspiration, a clinical correlate of a flattened diaphragm.

Q: Honey comb lung appearance is seen in which of the following conditions?

Scleroderma. **Explanation:** **Honeycombing** is the radiological hallmark of **end-stage pulmonary fibrosis**. It is characterized by the presence of small, cystic airspaces (3–10 mm in diameter) with thick, well-defined walls, typically arranged in layers in the subpleural and basal regions of the lung. 1. **Why Scleroderma is correct:** Scleroderma (Systemic Sclerosis) is a connective tissue disorder frequently associated with **Interstitial Lung Disease (ILD)**, most commonly the NSIP (Non-Specific Interstitial Pneumonitis) or UIP (Usual Interstitial Pneumonitis) patterns. Chronic inflammation leads to irreversible architectural distortion and fibrosis, resulting in the classic "honeycomb" appearance on HRCT. 2. **Why other options are incorrect:** * **Consolidation:** Characterized by the replacement of alveolar air with fluid, pus, or cells. It presents as increased lung opacity with **air bronchograms**, not cystic fibrosis. * **Alveolar cell carcinoma (Adenocarcinoma in situ):** Typically presents as a "ground-glass" nodule or a lepidic growth pattern (pneumonic form), often showing the **"CT angiogram sign."** * **Pulmonary edema:** Features include Kerley B lines, pleural effusion, and peribronchial cuffing due to fluid overload, which is reversible and non-fibrotic. **High-Yield Clinical Pearls for NEET-PG:** * **HRCT** is the gold standard for diagnosing honeycombing. * **Differential Diagnosis for Honeycombing (Mnemonic: SHIT):** **S**arcoidosis (Stage IV), **H**istiocytosis X (LCH), **I**diopathic Pulmonary Fibrosis (IPD/UIP), **T**herapeutic drugs (Amiodarone/Bleomycin) or **T**he Connective tissue diseases (Scleroderma/RA). * **UIP Pattern:** Honeycombing is a mandatory requirement for a "Definite UIP" diagnosis on HRCT.

Q: What is the best position for a chest X-ray to detect a minimal right pleural effusion?

Right lateral decubitus. **Explanation:** The detection of pleural effusion on a chest X-ray depends on the volume of fluid and the patient's position relative to gravity. **Why Right Lateral Decubitus is Correct:** In the lateral decubitus position, the patient lies on their side. Gravity causes free-flowing pleural fluid to accumulate along the dependent chest wall. This creates a linear opacity between the inner rib cage and the lung parenchyma. The **Right Lateral Decubitus** is the most sensitive projection for a **right-sided** effusion because it allows even minimal amounts of fluid (as little as **5–10 mL**) to be visualized. **Analysis of Incorrect Options:** * **Erect (PA/AP):** This is the standard screening view. However, it requires at least **175–200 mL** of fluid to cause "blunting" of the costophrenic angle. It is not sensitive enough for "minimal" effusions. * **Supine:** In a supine patient, fluid layers posteriorly. This results in a vague, ground-glass opacification (veiling) of the entire hemithorax rather than a distinct fluid level, making it very difficult to quantify small amounts. * **Left Lateral Decubitus:** This position would be used to detect a minimal *left-sided* effusion. For a right-sided effusion, the fluid would move toward the mediastinum, making it harder to see. **NEET-PG High-Yield Pearls:** * **Sensitivity Hierarchy:** Lateral Decubitus (5-10 mL) > Lateral View (75 mL) > Erect PA View (175-200 mL). * **USG Chest:** The gold standard for bedside detection and localization; it can detect as little as **3–5 mL** of fluid. * **Loculated Effusion:** If fluid does not shift on a decubitus film, it suggests the effusion is loculated (common in empyema). * **Ellis S-shaped curve:** The characteristic upper border of a large pleural effusion seen on an erect X-ray.

Question 1

What is the best investigation for diagnosing minimal right pleural effusion?

Accepted Answer

Ultrasound (USG)

Answer

Right lateral decubitus X-ray

Answer

CT scan

Answer

Left lateral decubitus X-ray

Question 2

A chest X-ray shows Hilar vascular markings, Kerley B lines, and a hazy left lung field. What is the most likely diagnosis?

Accepted Answer

Mild congestive heart failure

Answer

Pleural effusion

Answer

Bronchiectasis

Answer

Emphysema

Question 3

A patient presents with chronic productive cough and clubbing, with coarse rales on auscultation. What is the diagnosis suggested by the CT scan shown?

Accepted Answer

Bilateral varicose bronchiectasis

Answer

Multiple cavitating secondaries

Answer

Interstitial fibrosis

Answer

Miliary tuberculosis

Question 4

Kerley lines are typically seen in which of the following conditions?

Accepted Answer

Mitral stenosis and Interstitial edema

Answer

Pleural effusion and Interstitial edema

Answer

Pleural effusion and Mitral stenosis

Answer

Mitral stenosis and Pericardial effusion

Question 5

Which of the following shows splaying of the carina in the retrocardiac shadow?

Accepted Answer

Left atrium enlargement

Answer

Left ventricle enlargement

Answer

Right atrium enlargement

Answer

Right ventricle enlargement

Question 6

Which of the following statements about loculated pleural effusion is false?

Accepted Answer

The opacity may show air bronchogram.

Answer

They form obtuse angles against the mediastinum/chest wall when viewed in profile.

Answer

They have unsharp margins when viewed enface.

Answer

They do not conform to segmental distribution.

Question 7

What is the cause of posterior mediastinal opacity on a PA and lateral view of a chest X-ray?

Accepted Answer

Bochdalek's hernia

Answer

Lymph node mass

Answer

Tortuous innominate artery

Answer

Aneurysm

Question 8

Which of the following is NOT a true radiographic finding in emphysema?

Accepted Answer

Decreased intercostal space

Answer

Low, flat diaphragm with a flattened or 'tarrace' pattern

Answer

Tubular heart

Answer

Increased radiolucence

Question 9

Honey comb lung appearance is seen in which of the following conditions?

Accepted Answer

Scleroderma

Answer

Consolidation

Answer

Alveolar cell carcinoma

Answer

Pulmonary edema

Question 10

What is the best position for a chest X-ray to detect a minimal right pleural effusion?

Accepted Answer

Right lateral decubitus

Answer

Erect

Answer

Supine

Answer

Left lateral decubitus

Chest Radiology — MCQs

Chest Radiology — MCQs

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