Chest Radiology Practice Questions

Q: Which of the following features is characteristic of a benign lung lesion?

Speckled calcification. **Explanation:** In chest radiology, the pattern of calcification is the most reliable indicator for differentiating benign from malignant pulmonary nodules. **1. Why Speckled Calcification is Correct:** **Speckled (or central/diffuse/popcorn/laminated)** calcification patterns are hallmarks of benign lesions. Specifically, **speckled or central calcification** is typically seen in granulomas (like Tuberculosis or Histoplasmosis), while "popcorn" calcification is pathognomonic for Hamartomas. These patterns indicate a slow-growing, organized process. **2. Analysis of Incorrect Options:** * **Peripheral Calcification (B):** Also known as "stippled" or "eccentric" calcification, this is highly suspicious for **malignancy**. It often occurs when a tumor engulfs a pre-existing granuloma or when the tumor itself undergoes necrotic calcification. * **Ring Enhancement (C):** On contrast-enhanced CT, ring (peripheral) enhancement is often associated with lung abscesses or necrotic malignant tumors. Benign lesions typically show minimal or uniform enhancement. * **Hot spot with radio labeling agent (D):** This refers to high uptake on a **PET scan (18-FDG)**. A "hot spot" indicates high metabolic activity, which is a classic feature of **malignancy** (though it can occasionally be seen in active infections). **Clinical Pearls for NEET-PG:** * **Benign Patterns:** Diffuse, Central, Laminated (concentric), and Popcorn. * **Malignant Patterns:** Stippled, Eccentric, or absence of calcification. * **Size & Stability:** A lesion that remains stable in size for **2 years** is generally considered benign. * **Growth:** A doubling time of 18 months suggests benignity.

Q: Which sign on chest X-ray is suggestive of carcinoma lung?

Rib erosion. **Explanation:** **Rib erosion** is a highly specific radiological sign of malignancy in the context of a lung mass. It indicates direct chest wall invasion by the tumor, most classically seen in **Pancoast tumors** (superior sulcus tumors). While benign conditions like actinomycosis or chronic pressure can occasionally affect ribs, in the context of a pulmonary lesion, rib destruction is considered a hallmark of locally advanced bronchogenic carcinoma. **Analysis of Incorrect Options:** * **Central destruction within lesion:** While this refers to cavitation, it is non-specific. Cavitation can occur in lung cancer (especially Squamous Cell Carcinoma), but it is also a classic feature of lung abscesses and pulmonary tuberculosis. * **Flattening of diaphragm:** This is a sign of **hyperinflation**, typically seen in chronic obstructive pulmonary disease (COPD) or asthma, rather than a direct indicator of malignancy. * **Calcification:** Generally, calcification within a solitary pulmonary nodule suggests a **benign** etiology (e.g., granuloma or hamartoma). Malignant lesions are typically non-calcified, though they may rarely engulf pre-existing calcifications. **Clinical Pearls for NEET-PG:** * **S-sign of Golden:** Seen when a right upper lobe mass causes collapse, creating an 'S' shape on X-ray; highly suggestive of bronchogenic carcinoma. * **Calcification Patterns:** "Popcorn" calcification is characteristic of **Hamartoma**, while "concentric" or "solid" patterns suggest old granulomatous disease (benign). * **Pancoast Syndrome:** Look for a triad of Horner’s syndrome, rib destruction, and shoulder pain (brachial plexus involvement).

Q: Which of the following radiological signs is typically present in a patient with symptoms suggestive of pulmonary embolism?

All of the above. **Explanation:** Pulmonary Embolism (PE) is a critical diagnosis in radiology. While a chest X-ray is often normal in PE patients, certain classic signs can point toward the diagnosis. The correct answer is **"All of the above"** because each option represents a distinct pathophysiological consequence of a pulmonary embolus. 1. **Hampton’s Hump:** This is a wedge-shaped, pleura-based opacification with its apex pointing toward the hilum. It represents **pulmonary infarction** and is typically seen in the lower lobes. 2. **Westermark Sign:** This refers to **focal oligemia** (decreased vascular markings) distal to the occluded pulmonary artery. It occurs because the thrombus obstructs blood flow, making that area of the lung appear more radiolucent (blacker). 3. **Fleischner Sign:** This is a **prominent central pulmonary artery** caused by the presence of a large thrombus (distending the vessel) or pulmonary hypertension secondary to the embolism. **Clinical Pearls for NEET-PG:** * **Most common X-ray finding in PE:** A normal chest X-ray (or non-specific atelectasis/effusion). * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA). * **ECG Findings:** Most common is sinus tachycardia; most specific is the **S1Q3T3 pattern** (sign of acute right heart strain). * **Palla’s Sign:** Another radiological sign similar to Fleischner sign, specifically referring to an enlarged right descending pulmonary artery. * **Knuckle Sign:** Abrupt tapering of a pulmonary artery branch due to an embolus.

Q: What is an early radiographic sign of pulmonary edema on a chest X-ray?

Kerley B lines. **Explanation:** Pulmonary edema typically progresses through three distinct radiological stages based on pulmonary capillary wedge pressure (PCWP). Understanding this sequence is crucial for NEET-PG: 1. **Stage 1 (PCWP 13-18 mmHg):** Characterized by **Cephalization** (upper lobe venous diversion). 2. **Stage 2 (PCWP 18-25 mmHg):** Characterized by **Interstitial Edema**. The earliest sign of this stage is the appearance of **Kerley B lines**. These are short (1-2 cm), thin, horizontal lines seen at the lung peripheries (costophrenic angles), representing fluid-thickened interlobular septa. 3. **Stage 3 (PCWP >25 mmHg):** Characterized by **Alveolar Edema**, where fluid spills into the air spaces. **Analysis of Options:** * **Kerley B lines (Correct):** As fluid begins to leak into the interstitium before reaching the alveoli, these lines represent the earliest measurable sign of interstitial congestion. * **Batwing appearance:** This is a late sign seen in Stage 3 (Alveolar Edema), representing bilateral perihilar opacities with peripheral clearing. * **Pleural effusion:** While common in congestive heart failure, it usually occurs alongside or after interstitial changes; it is not the "earliest" sign. * **Ground-glass lung fields:** This indicates partial filling of alveoli or interstitial thickening; while seen in edema, it is non-specific and typically follows the initial septal thickening (Kerley lines). **High-Yield Pearls for NEET-PG:** * **Kerley A lines:** Longer lines radiating from the hila (representing lymphatic distension). * **Cephalization (Antler Sign):** The very first sign of pulmonary venous hypertension. * **Peribronchial Cuffing:** Another sign of interstitial edema where bronchial walls appear thickened due to fluid.

Q: What volume of fluid is required to produce costophrenic angle blunting on erect chest X-ray in cases of pleural effusion?

300ml. **Explanation:** The detection of pleural effusion on a chest X-ray (CXR) depends significantly on the patient's position and the volume of fluid present. In an **erect (upright) PA view**, fluid first accumulates in the most dependent part of the pleural space—the posterior costophrenic sulcus. As the volume increases, it fills the lateral costophrenic angles. 1. **Why 300ml is correct:** While the earliest blunting of the *posterior* costophrenic angle (visible on a lateral view) occurs with approximately 75–100ml of fluid, it typically requires **250–300ml** of fluid to cause visible blunting of the *lateral* costophrenic angle on a standard **frontal (PA) erect CXR**. This is a classic high-yield threshold for radiological diagnosis. 2. **Why other options are incorrect:** * **100ml:** This volume is sufficient to blunt the posterior angle on a **lateral view**, but is usually insufficient to be clearly seen on a frontal PA view. * **500ml & 750ml:** These volumes are well above the minimum threshold. At 500ml, the fluid level typically reaches the dome of the diaphragm, and at 1000ml+, it may obscure half of the hemithorax. **High-Yield Clinical Pearls for NEET-PG:** * **Most sensitive view:** The **Lateral Decubitus view** (with the affected side down) is the most sensitive, detecting as little as **5–10ml** of fluid. * **Lateral View (Erect):** Blunting of the posterior costophrenic angle requires **~75–100ml**. * **Supine View:** Fluid layers posteriorly; look for a "ground-glass" haziness over the hemithorax with preserved vascular markings. * **Ellis S-shaped curve:** The characteristic meniscus sign seen in moderate effusions due to the negative intrapleural pressure and lung elastic recoil.

Q: If the right cardiac silhouette is obliterated, it means the pathology involves which of the following?

Right middle lobe. ### Explanation The correct answer is **A. Right middle lobe**. This question is based on the **Silhouette Sign**, a fundamental concept in chest radiology. The silhouette sign occurs when two structures of similar radiographic density (e.g., soft tissue and fluid/consolidation) are in direct anatomical contact, causing the border between them to disappear or become "obliterated." **1. Why Right Middle Lobe (RML) is correct:** Anatomically, the RML lies anteriorly and is in direct contact with the **right atrium**, which forms the right heart border on a PA chest X-ray. Therefore, any pathology in the RML (like pneumonia or collapse) will obliterate the right cardiac silhouette. **2. Why other options are incorrect:** * **B. Right lower lobe:** The right lower lobe (RLL) is located posteriorly. It does not touch the heart border but is in contact with the **diaphragm**. Consolidation here would obliterate the right hemidiaphragm (positive silhouette sign) but leave the heart border sharp. * **C. Right atrium:** The right atrium *forms* the right cardiac silhouette; it is not the pathology *causing* the obliteration in the context of pulmonary imaging. * **D. Right ventricle:** The right ventricle forms the anterior surface of the heart and the lower part of the left heart border/retrosternal space; it does not form the right heart border on a PA view. **3. High-Yield Clinical Pearls for NEET-PG:** * **Right Heart Border:** Obliterated by **Right Middle Lobe** pathology. * **Left Heart Border:** Obliterated by **Lingula** (Left Upper Lobe) pathology. * **Right Hemidiaphragm:** Obliterated by **Right Lower Lobe** pathology. * **Left Hemidiaphragm:** Obliterated by **Left Lower Lobe** pathology. * **Aortic Knuckle:** Obliterated by **Left Upper Lobe (posterior segment)** pathology. * **Descending Aorta:** Obliterated by **Left Lower Lobe** pathology.

Q: All are differential diagnoses for the CT chest finding shown, except?

Diffuse pulmonary lymphangioleiomyomatosis. ***Diffuse pulmonary lymphangioleiomyomatosis*** - **LAM** characteristically presents with **diffuse thin-walled cysts** throughout both lungs, not a miliary/micronodular pattern. - This **cystic pattern** is pathognomonic for LAM and easily distinguishable from the nodular findings described in the CT. *Hemosiderosis* - Can present with **bilateral diffuse micronodules** due to **hemosiderin deposition** in pulmonary macrophages. - Often shows **ground-glass opacities** with micronodular pattern on high-resolution CT, fitting the described finding. *Tropical pulmonary eosinophilia* - Caused by **filarial infection** and presents with **bilateral diffuse micronodular** or reticulonodular opacities. - Associated with **peripheral eosinophilia** and **elevated IgE levels**, commonly showing miliary pattern on imaging. *Collagen vascular disorders* - Conditions like **systemic sclerosis** and **rheumatoid arthritis** can cause **diffuse micronodular** interstitial patterns. - Often progress to **honeycombing** and **fibrosis**, but early stages show fine nodular opacities matching the CT finding.

Q: Bilateral pleural thickening in the lower and middle lung zones is a radiological feature of which condition?

Asbestosis. **Explanation:** **Asbestosis** is the correct answer because asbestos-related lung disease has a unique predilection for the **pleura** and the **lower lung zones**. The hallmark radiological features include bilateral pleural plaques (circumscribed thickening) and diffuse pleural thickening, typically involving the middle and lower zones. This distribution occurs because asbestos fibers are inhaled and gravitate toward the lung bases due to gravity and diaphragmatic movement. Over time, these fibers cause subpleural fibrosis and calcification (the "Holly Leaf" sign). **Why the other options are incorrect:** * **Silicosis (A):** Characteristically involves the **upper lobes**. It presents with multiple small, rounded opacities and "Eggshell calcification" of the hilar lymph nodes, rather than primary pleural thickening. * **Stannosis (B):** Caused by tin dust inhalation. It is a benign pneumoconiosis characterized by very dense, small "tin-like" opacities distributed throughout the lung parenchyma, but it does not typically cause pleural thickening. * **Siderosis (C):** Caused by iron oxide (welder's lung). Like stannosis, it is a benign condition showing fine reticulonodular shadows without significant pleural involvement or progressive fibrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Distribution:** Asbestosis = Lower Lobes; Silicosis/Coal Worker's Pneumoconiosis = Upper Lobes. * **Pleural Plaques:** These are the most common manifestation of asbestos exposure and are typically **parietal**, sparing the costophrenic angles. * **Malignancy:** Asbestosis increases the risk of both Bronchogenic Carcinoma (most common) and Mesothelioma (most specific). * **Imaging:** HRCT is the gold standard for detecting early subpleural curvilinear lines and honeycombing in asbestosis.

Question 1

Which of the following features is characteristic of a benign lung lesion?

Accepted Answer

Speckled calcification

Answer

Peripheral calcification

Answer

Ring enhancement

Answer

Shows hot spot with radio labeling agent

Question 2

Which sign on chest X-ray is suggestive of carcinoma lung?

Accepted Answer

Rib erosion

Answer

Central destruction within lesion

Answer

Flattening of diaphragm

Answer

Calcification

Question 3

Which of the following radiological signs is typically present in a patient with symptoms suggestive of pulmonary embolism?

Accepted Answer

All of the above

Answer

Hampton's hump

Answer

Westermark sign

Answer

Fleischner sign

Question 4

What is an early radiographic sign of pulmonary edema on a chest X-ray?

Accepted Answer

Kerley B lines

Answer

Batwing appearance

Answer

Pleural effusion

Answer

Ground-glass lung fields

Question 5

What volume of fluid is required to produce costophrenic angle blunting on erect chest X-ray in cases of pleural effusion?

Accepted Answer

300ml

Answer

100ml

Answer

500ml

Answer

750ml

Question 6

Rib notching is a characteristic radiological finding in which of the following conditions?

Accepted Answer

Coarctation of aorta

Answer

Hypertension

Answer

Fibromuscular dysplasia

Answer

Aortic dissection

Question 7

If the right cardiac silhouette is obliterated, it means the pathology involves which of the following?

Accepted Answer

Right middle lobe

Answer

Right lower lobe

Answer

Right atrium

Answer

Right ventricle

Question 8

All are differential diagnoses for the CT chest finding shown, except?

Accepted Answer

Diffuse pulmonary lymphangioleiomyomatosis

Answer

Hemosiderosis

Answer

Tropical pulmonary eosinophilia

Answer

Collagen vascular disorders

Question 9

Which of the following conditions characteristically show honeycomb lung on chest X-ray?

Accepted Answer

Rheumatoid Arthritis, Tuberculosis, Scleroderma, Interstitial lung disease

Answer

Tuberculosis, Scleroderma, Carcinoma, Interstitial lung disease

Answer

Rheumatoid Arthritis, Scleroderma, Carcinoma, Interstitial lung disease

Answer

Rheumatoid Arthritis, Tuberculosis, Carcinoma, Interstitial lung disease

Question 10

Bilateral pleural thickening in the lower and middle lung zones is a radiological feature of which condition?

Accepted Answer

Asbestosis

Answer

Silicosis

Answer

Stannosis

Answer

Siderosis

Chest Radiology — MCQs

Chest Radiology — MCQs

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