Chest Radiology Practice Questions

Q: The Spinnaker Sail sign is seen in which of the following conditions?

Pneumomediastinum. **Explanation:** The **Spinnaker Sail sign** (also known as the Angel Wing sign) is a classic radiographic finding pathognomonic for **Pneumomediastinum** in neonates and infants. **1. Why Pneumomediastinum is correct:** When air escapes into the mediastinum, it dissects between the pericardium and the parietal pleura. In pediatric patients, this air lifts the lobes of the **thymus** superiorly and laterally away from the cardiac silhouette. On a frontal chest X-ray, the displaced thymic lobes resemble the sails of a boat (Spinnaker sails). This sign is rarely seen in adults because the thymus undergoes involution after puberty. **2. Why the other options are incorrect:** * **Pseudopneumomediastinum:** This refers to artifacts that mimic air in the mediastinum, such as the Mach band effect or skin folds. While it looks like pneumomediastinum, the anatomical displacement of the thymus (the "sail") is absent. * **Pleural effusion:** This presents as blunting of the costophrenic angles or a meniscus sign. It involves fluid in the pleural space, not air in the mediastinum. * **Pulmonary infarct:** This typically presents as **Hampton’s Hump** (a wedge-shaped opacity) on a chest X-ray, unrelated to thymic displacement. **Clinical Pearls for NEET-PG:** * **Continuous Diaphragm Sign:** Another sign of pneumomediastinum where air trapped behind the pericardium allows the central portion of the diaphragm to be seen. * **Naclerio’s V sign:** A V-shaped air lucency seen in the lower mediastinum, often associated with esophageal rupture (Boerhaave syndrome). * **Sail Sign vs. Spinnaker Sail Sign:** Do not confuse them. A normal **"Sail Sign"** is a healthy thymus appearing as a triangular opacity in a normal pediatric X-ray; the **"Spinnaker Sail Sign"** is the abnormal lifting of that thymus by air.

Q: Hoffman-Rigler sign for enlargement of the left ventricle is seen on which radiographic view?

Lateral view of the chest. **Explanation:** The **Hoffman-Rigler sign** is a classic radiographic sign used to identify **Left Ventricular Enlargement (LVE)**. It is specifically assessed on a **Lateral view of the chest**. **Why the Lateral View is Correct:** The left ventricle forms the posterior-inferior border of the cardiac silhouette. On a lateral radiograph, LVE is suggested if the posterior border of the left ventricle displaces posteriorly and overlaps the inferior vena cava (IVC). Specifically, the sign is positive if the left ventricular border extends **more than 1.8 cm posterior** to the posterior border of the IVC at a level 2 cm cephalad to the intersection of the IVC and the diaphragm. **Why Other Options are Incorrect:** * **PA/AP View:** While these views show an increased cardiothoracic ratio and a "down-and-out" apex in LVE, the specific Hoffman-Rigler measurement requires the depth perspective provided only by the lateral projection. * **Apicogram:** This is a specialized view (Lordotic view) used primarily to visualize lesions in the lung apices (e.g., TB or Pancoast tumors) by displacing the clavicles; it has no role in measuring chamber enlargement. **High-Yield Clinical Pearls for NEET-PG:** * **Left Atrial Enlargement (LAE):** Look for the "Double density sign," "Splaying of the carina" (widening of the subcarinal angle >90°), and "Walking cane sign" (posterior displacement of the left main bronchus) on PA/Lateral views. * **Right Ventricular Enlargement (RVE):** On the lateral view, RVE is characterized by the filling of the **retrosternal clear space**. * **Most sensitive view for small pleural effusion:** Lateral decubitus view. * **Most sensitive view for pneumoperitoneum:** Chest X-ray PA view (Erect), looking for air under the diaphragm.

Q: What is the best imaging modality for bronchogenic carcinoma?

CT. **Explanation:** **Computed Tomography (CT)** is the gold standard and best imaging modality for the evaluation of bronchogenic carcinoma. Its superiority lies in its high spatial resolution, which allows for the precise assessment of the primary tumor size, its relationship to adjacent structures (like the chest wall or mediastinum), and the detection of occult pulmonary nodules. Furthermore, **Contrast-Enhanced CT (CECT)** is essential for staging, as it accurately identifies hilar and mediastinal lymphadenopathy and detects common sites of metastasis, such as the liver and adrenal glands. **Why other options are incorrect:** * **MRI:** While excellent for evaluating superior sulcus (Pancoast) tumors to check for brachial plexus or vertebral involvement, MRI is generally inferior to CT for lung parenchyma due to motion artifacts from breathing and low proton density in the lungs. * **Bronchoscopy:** This is an **invasive diagnostic procedure**, not an imaging modality. While it is crucial for obtaining a tissue biopsy and assessing endobronchial spread, it cannot stage the outer extent of the tumor or distant metastases. * **Chest X-ray (Not listed but relevant):** Usually the initial screening tool, but it lacks the sensitivity to detect small lesions or provide detailed staging. **High-Yield Clinical Pearls for NEET-PG:** * **Staging:** CT is the modality of choice for **T (Tumor)** and **N (Node)** staging; **PET-CT** is the most sensitive for **M (Metastasis)** staging. * **Screening:** Low-Dose CT (LDCT) is the recommended screening tool for high-risk smokers. * **Calcification Patterns:** Eccentric or stippled calcification in a nodule suggests malignancy, whereas "popcorn" calcification is classic for Hamartoma.

Q: Disseminated small nodules with calcification in a chest X-ray suggest which of the following conditions?

Histoplasmosis. **Explanation:** The presence of disseminated small nodules with calcification on a chest X-ray is a classic radiologic presentation of **healed Histoplasmosis**. **1. Why Histoplasmosis is correct:** *Histoplasma capsulatum* is a dimorphic fungus often associated with bird or bat droppings. In the acute phase, it causes granulomatous inflammation. As these granulomas heal, they undergo **dystrophic calcification**, resulting in multiple, small (punctate), well-defined calcified nodules scattered throughout the lung parenchyma (often referred to as "buckshot calcification"). It is also frequently associated with calcified hilar or mediastinal lymph nodes. **2. Why the other options are incorrect:** * **Aspergillosis:** Typically presents as an "Aspergilloma" (fungus ball in a pre-existing cavity with a Monod sign/air crescent) or as Allergic Bronchopulmonary Aspergillosis (ABPA) with "finger-in-glove" opacities. It does not typically present as disseminated calcified nodules. * **Cryptococcosis:** Usually presents as solitary or multiple pulmonary nodules or masses (often non-calcified) or interstitial infiltrates, especially in immunocompromised patients. * **Coccidioidomycosis:** Often presents with thin-walled cavities, nodules, or pneumonia. While it can cause granulomas, disseminated miliary-style calcification is much more characteristic of Histoplasmosis. **Clinical Pearls for NEET-PG:** * **Differential Diagnosis for Miliary/Disseminated Calcified Nodules:** Healed Histoplasmosis, Healed Varicella Pneumonia (usually smaller/finer), Silicosis (look for "eggshell calcification" of nodes), and Mitral Stenosis (ossified nodules). * **Histoplasmosis Key Word:** "Buckshot calcification." * **Splenic Calcifications:** Histoplasmosis is also a common cause of multiple small "starry sky" calcifications in the spleen.

Q: What is the best view for a chest X-ray?

P.A. view. The **Postero-Anterior (PA) view** is considered the "gold standard" and the best routine view for a chest X-ray due to several anatomical and physical advantages: ### 1. Why PA View is the Best (Correct Answer) * **Reduced Cardiac Magnification:** In the PA view, the heart is closer to the film/detector. According to the principles of divergent X-ray beams, the closer an object is to the detector, the less it is magnified. This allows for an accurate assessment of the **Cardio-Thoracic Ratio (CTR)**. * **Scapular Displacement:** Patients are instructed to rotate their shoulders forward, which moves the scapulae laterally out of the lung fields, providing a clearer view of the lung parenchyma. * **Inspiratory Effort:** PA views are typically taken in a standing position with a full deep breath, allowing for better visualization of the lung bases and the diaphragm (usually at the level of the 10th posterior rib). ### 2. Why Other Options are Incorrect * **A.P. View:** Used primarily for bedridden or critically ill patients (portable X-rays). Because the heart is further from the detector, it appears **falsely enlarged** (spurious cardiomegaly), and the scapulae often overlie the lung fields. * **Lateral View:** While excellent for visualizing the "hidden areas" (retrocardiac and retrosternal spaces), it is a supplementary view and cannot replace the PA view for primary screening. ### 3. High-Yield Clinical Pearls for NEET-PG * **Distance:** A standard PA view is taken at a distance of **6 feet (72 inches)** to further minimize magnification. * **Lordotic View:** Best for visualizing **apical lung tumors** (Pancoast tumors) or TB lesions obscured by the clavicles. * **Lateral Decubitus View:** The most sensitive conventional view for detecting **small pleural effusions** (as little as 5-10 ml). * **Expiratory Film:** Indicated for detecting a small **pneumothorax** or foreign body aspiration (air trapping).

Q: A bedridden patient experiences acute chest pain which is worsened by breathing. Which imaging techniques could be helpful?

CT scan. **Explanation:** The clinical presentation of a bedridden patient with acute pleuritic chest pain is highly suggestive of **Pulmonary Embolism (PE)**. Immobilization is a major risk factor for Deep Vein Thrombosis (DVT), which can lead to PE. **1. Why CT Scan is the Correct Answer:** **CT Pulmonary Angiography (CTPA)** is currently the **gold standard** and investigation of choice for diagnosing acute pulmonary embolism. It allows for direct visualization of the embolus as a filling defect within the pulmonary arteries. It is preferred due to its high sensitivity, specificity, and ability to provide alternative diagnoses (like pneumonia or aortic dissection) if PE is ruled out. **2. Why Other Options are Incorrect:** * **X-ray Chest:** Usually the first investigation performed, but it is often **normal** in PE (the "normal CXR in a hypoxic patient" sign). While it can show signs like *Westermark sign* or *Hampton’s hump*, these are rare and non-specific. Its primary role is to rule out other causes like pneumothorax. * **Ventilation-Perfusion (V/Q) Scan:** Previously the first-line test, it is now reserved for patients with **renal failure** (where contrast is contraindicated) or pregnancy. It is less definitive than CTPA. * **Ultrasound (USG):** While bedside lung USG can show peripheral infarcts and Lower Limb Doppler can identify DVT, it cannot definitively diagnose or map a pulmonary embolism in the central vasculature. **Clinical Pearls for NEET-PG:** * **Gold Standard/IOC for PE:** CT Pulmonary Angiography (CTPA). * **Most common ECG finding in PE:** Sinus Tachycardia (Specific but rare: S1Q3T3 pattern). * **Most common X-ray finding:** Normal (or non-specific atelectasis). * **Definitive Gold Standard (Invasive):** Conventional Pulmonary Angiography (rarely used now).

Q: What is the ideal method for screening for lung secondaries?

CT scan. **Explanation:** The detection of pulmonary metastases (lung secondaries) is critical for staging malignancies. **Computed Tomography (CT) scan** is the gold standard and ideal screening method because of its superior spatial resolution and ability to detect small nodules (as small as 1–2 mm) that are often obscured by bony structures or the heart on conventional imaging. * **Why CT Scan is Correct:** CT provides cross-sectional imaging without overlapping structures. It is highly sensitive for identifying "cannonball" or "miliary" patterns of spread and can detect nodules in the lung apices, costophrenic angles, and retrocardiac areas—regions where other modalities often fail. * **Why Chest X-ray is Incorrect:** While often the first-line investigation due to cost and availability, CXR has low sensitivity. It can miss up to 20–30% of small nodules, especially those under 1 cm or those located in "blind spots" like the hilar regions. * **Why MRI is Incorrect:** MRI has limited utility in lung parenchyma due to low proton density and artifacts caused by respiratory motion and air-tissue interfaces. It is generally reserved for evaluating chest wall invasion or apical (Pancoast) tumors. * **Why Enzyme Assay is Incorrect:** There is no specific enzyme assay that can reliably screen for the physical presence of lung secondaries; diagnosis requires anatomical imaging. **High-Yield Clinical Pearls for NEET-PG:** * **HRCT vs. Contrast CT:** For screening metastases, a standard **Contrast-Enhanced CT (CECT)** is preferred over HRCT to differentiate nodules from vascular structures. * **Feeding Vessel Sign:** A distinct vessel leading to a nodule on CT is highly suggestive of hematogenous pulmonary metastasis. * **Most Common Primary:** In males, the most common primary site leading to lung secondaries is the GI tract/Prostate; in females, it is Breast cancer.

Q: "Snow-storm" appearance is seen in which condition?

Silicosis. ### Explanation **Correct Answer: B. Silicosis** **Why Silicosis is correct:** Silicosis is a fibrotic lung disease caused by the inhalation of crystalline silica particles. The characteristic **"Snow-storm" appearance** refers to the radiological finding on a chest X-ray, where numerous small, rounded opacities (silicotic nodules) are distributed throughout the lung fields, predominantly in the upper lobes. These nodules are discrete, 1–3 mm in size, and mimic the appearance of falling snow. **Analysis of Incorrect Options:** * **A. Anthracosis:** Caused by coal dust inhalation. It typically presents as "Coal Worker's Pneumoconiosis." Radiologically, it shows small opacities, but the classic "snow-storm" descriptor is specific to silicosis. * **C. Byssinosis:** Caused by cotton dust. It is characterized by "Monday Morning Fever" and progressive dyspnea. It is an airway disease (bronchoconstriction) rather than a nodular fibrotic disease, so it does not show a snow-storm pattern. * **D. Bagassosis:** Caused by sugarcane dust (thermophilic actinomycetes). It is a type of hypersensitivity pneumonitis. X-rays usually show mottling or a "ground-glass" appearance during acute phases, not discrete snow-storm nodules. **High-Yield Clinical Pearls for NEET-PG:** * **Egg-shell Calcification:** Another classic radiological sign of Silicosis, referring to the calcification of hilar lymph nodes. * **Complication:** Silicosis significantly increases the risk of **Tuberculosis** (Silicotuberculosis) due to impaired macrophage function. * **Occupations at risk:** Mining, sandblasting, stone cutting, and glass manufacturing. * **Differential Diagnosis:** A "snow-storm" appearance on X-ray can also be seen in **Miliary Tuberculosis** and **Metastatic Thyroid Carcinoma**, but in the context of occupational health, Silicosis is the primary answer.

Q: On a chest X-ray, if an 'air bronchogram' is seen within an opacity, what does this finding indicate about the opacity?

Intrapulmonary. ### Explanation **1. Why the Correct Answer is Right:** An **air bronchogram** refers to the visualization of air-filled, dark (radiolucent) bronchi silhouetted against a background of opaque (radiopaque) lung parenchyma. Under normal conditions, bronchi are not visible because they are filled with air and surrounded by air-filled alveoli. When the surrounding alveoli are filled with fluid, pus, blood, or cells (consolidation), the air-filled bronchi become visible. Since bronchi are intrinsic structures of the lung, their presence within an opacity confirms that the lesion is **Intrapulmonary**. **2. Why the Incorrect Options are Wrong:** * **Extrapleural (A) and Extrapulmonary (D):** These terms refer to lesions originating outside the lung (e.g., chest wall, ribs, or mediastinum). These structures do not contain bronchi; therefore, an air bronchogram can never be seen within them. * **Intrapleural (B):** This refers to the pleural space. Conditions like pleural effusion or hemothorax occupy the space between the visceral and parietal pleura. Since there are no airways in the pleural space, an air bronchogram is absent. In fact, a large pleural effusion often obscures or compresses the underlying lung. **3. NEET-PG High-Yield Pearls:** * **Most Common Cause:** Air bronchograms are most classically associated with **lobar pneumonia**. * **Other Causes:** Pulmonary edema, pulmonary hemorrhage, hyaline membrane disease (RDS), and certain tumors like bronchoalveolar carcinoma (now Adenocarcinoma in situ). * **Exclusion:** An air bronchogram is typically **absent** in pleural effusions and most cases of lung collapse (atelectasis) where the bronchus itself is obstructed. * **Golden S-Sign:** Remember that if a bronchus is obstructed by a mass, you will see collapse *without* an air bronchogram.

Q: Silhouetting of the left border of the heart on a chest radiograph (silhouette sign positive) indicates which of the following pathologies?

Lingular consolidation. **Explanation:** The **Silhouette Sign** is a fundamental principle in chest radiology. It occurs when two structures of similar radiodensity (e.g., soft tissue and fluid/consolidation) are in direct anatomical contact, causing the border between them to disappear. **Why Lingular Consolidation is Correct:** The **lingula** is the segment of the Left Upper Lobe (LUL) that is anatomically adjacent to the **left heart border**. When the lingula becomes consolidated, it loses its air and assumes the same density as the heart. Because they are in the same anatomical plane, the sharp interface is lost, "silhouetting" the left heart border. **Analysis of Incorrect Options:** * **A. Upper Lobe Consolidation:** While the lingula is part of the LUL, a general upper lobe consolidation (excluding the lingula) would silhouette the **left apical/superior mediastinal border**, not the heart border. * **B. Hilar Lymphadenopathy:** This typically presents as a lobulated mass or enlargement at the lung root. It may overlap the heart shadow but usually does not obliterate the heart border unless it is massive and anteriorly located. * **C. Lower Lobe Consolidation:** The Left Lower Lobe (LLL) lies posteriorly. Consolidation here will silhouette the **left hemidiaphragm** and the **descending aorta**, but the left heart border will remain crisp because the heart is an anterior structure. **High-Yield Clinical Pearls for NEET-PG:** * **Right Heart Border:** Silhouetted by **Right Middle Lobe (RML)** consolidation. * **Right Hemidiaphragm:** Silhouetted by **Right Lower Lobe (RLL)** consolidation. * **Aortic Knuckle:** Silhouetted by **Left Upper Lobe (LUL)** consolidation. * **Ascending Aorta:** Silhouetted by **Right Upper Lobe (RUL)** or anterior mediastinal masses. * **Rule of Thumb:** If you can see the heart border through a density, the pathology is posterior (Lower Lobe).

Question 1

The Spinnaker Sail sign is seen in which of the following conditions?

Accepted Answer

Pneumomediastinum

Answer

Pseudopneumomediastinum

Answer

Pleural effusion

Answer

Pulmonary infarct

Question 2

Hoffman-Rigler sign for enlargement of the left ventricle is seen on which radiographic view?

Accepted Answer

Lateral view of the chest

Answer

PA view of the chest

Answer

AP view of the chest

Answer

Apicogram of the chest

Question 3

What is the best imaging modality for bronchogenic carcinoma?

Accepted Answer

CT

Answer

MRI

Answer

Bronchoscopy

Answer

None

Question 4

Disseminated small nodules with calcification in a chest X-ray suggest which of the following conditions?

Accepted Answer

Histoplasmosis

Answer

Aspergillosis

Answer

Cryptococcosis

Answer

Coccidioidomycosis

Question 5

What is the best view for a chest X-ray?

Accepted Answer

P.A. view

Answer

A.P. view

Answer

Lateral view

Answer

None of the above

Question 6

A bedridden patient experiences acute chest pain which is worsened by breathing. Which imaging techniques could be helpful?

Accepted Answer

CT scan

Answer

Ultrasound (USG)

Answer

X-ray chest

Answer

Ventilation perfusion scan

Question 7

What is the ideal method for screening for lung secondaries?

Accepted Answer

CT scan

Answer

Chest X-ray

Answer

MRI

Answer

Enzyme assay

Question 8

"Snow-storm" appearance is seen in which condition?

Accepted Answer

Silicosis

Answer

Anthracosis

Answer

Byssinosis

Answer

Bagassosis

Question 9

On a chest X-ray, if an 'air bronchogram' is seen within an opacity, what does this finding indicate about the opacity?

Accepted Answer

Intrapulmonary

Answer

Extrapleural

Answer

Intrapleural

Answer

Extrapulmonary

Question 10

Silhouetting of the left border of the heart on a chest radiograph (silhouette sign positive) indicates which of the following pathologies?

Accepted Answer

Lingular consolidation

Answer

Upper lobe consolidation

Answer

Hilar lymphadenopathy

Answer

Lower lobe consolidation

Chest Radiology — MCQs

Chest Radiology — MCQs

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