Chest Radiology Practice Questions

Q: What is the initial diagnostic imaging modality of choice for suspected bronchiectasis?

High-resolution computed tomography (HRCT) scan. **Explanation:** **1. Why HRCT is the Correct Answer:** High-resolution computed tomography (HRCT) is the **gold standard** and initial diagnostic modality of choice for bronchiectasis. The underlying medical concept relies on HRCT’s ability to use thin slices (1–2 mm) and high-spatial-frequency reconstruction algorithms to visualize the bronchial wall and lumen with extreme precision. It allows for the identification of the classic **"Signet Ring Sign"** (where the internal diameter of the bronchus is larger than its accompanying pulmonary artery) and the lack of tapering of the bronchi toward the periphery. **2. Why Other Options are Incorrect:** * **Spiral CT:** While useful for general lung pathology, standard spiral CT uses thicker slices which may miss subtle bronchial wall thickening or small areas of cylindrical bronchiectasis. * **Bronchoscopy:** This is an invasive procedure used to identify the *cause* of localized bronchiectasis (e.g., foreign body or tumor) or to obtain cultures, but it cannot visualize the bronchial anatomy beyond the proximal airways. * **Pulmonary Angiography:** This is used to visualize pulmonary vasculature. It is only indicated in bronchiectasis if there is massive hemoptysis requiring bronchial artery embolization. **3. High-Yield Clinical Pearls for NEET-PG:** * **Signet Ring Sign:** The most characteristic HRCT finding (Broncho-arterial ratio >1). * **Tram-track Sign:** Seen on HRCT/X-ray representing non-tapering, thickened bronchial walls. * **Finger-in-glove Opacity:** Suggests Allergic Bronchopulmonary Aspergillosis (ABPA) causing mucoid impaction. * **Kartagener Syndrome:** Triad of Bronchiectasis, Sinusitis, and Situs Inversus. * **Chest X-ray:** Often the first test performed, but frequently normal in early disease; hence, HRCT remains the definitive diagnostic choice.

Q: Pulmonary thromboembolism on V-Q scan is suggested by:

Perfusion defect with normal ventilation. **Explanation:** The hallmark of **Pulmonary Thromboembolism (PTE)** on a V-Q (Ventilation-Perfusion) scan is a **V-Q Mismatch**. This occurs because a thrombus mechanically obstructs blood flow to a segment of the lung, while the airways remain patent, allowing air to reach the alveoli. * **Why Option B is correct:** In PTE, the area distal to the clot shows a **perfusion defect** (cold spot on scan) because the radiopharmaceutical (Technetium-99m MAA) cannot reach the capillaries. However, since the bronchial tree is unaffected, the **ventilation** (using Xenon-133 or Technetium-99m DTPA aerosol) remains **normal**. This "mismatch" is highly suggestive of an embolic event. * **Why other options are incorrect:** * **Option A:** A ventilation defect with normal perfusion (Reverse Mismatch) is typically seen in conditions like pneumonia, pulmonary edema, or atelectasis. * **Option B:** A "matched defect" (both V and Q are abnormal) suggests a primary parenchymal or airway disease (e.g., COPD, consolidation) rather than a vascular obstruction. * **Option D:** Normal scans effectively rule out PTE with a high negative predictive value. **High-Yield Clinical Pearls for NEET-PG:** * **PIOPED Criteria:** Used to categorize V-Q scans into High, Intermediate, or Low probability for PTE. Two or more large mismatched segmental defects indicate **High Probability**. * **Westermark Sign:** A focal area of oligemia (decreased vascularity) on a Chest X-ray, representing the radiographic equivalent of a perfusion defect. * **Hampton’s Hump:** A wedge-shaped opacity pointing toward the hilum, indicating pulmonary infarction. * **Gold Standard:** While V-Q scans are used in patients with renal failure or contrast allergy, **CT Pulmonary Angiography (CTPA)** is currently the investigation of choice for PTE.

Q: Which condition classically presents with an 'apical cap' on a chest X-ray?

Dissecting aneurysm. **Explanation:** The correct answer is **Dissecting aneurysm (Option A)**. An **apical cap** (pleural cap) refers to a curved, cap-like opacity at the very apex of the lung. In the context of trauma or acute chest pain, a left-sided apical cap is a classic radiological sign of a **thoracic aortic dissection** or **traumatic aortic rupture**. It occurs because blood from the mediastinal hematoma tracks superiorly along the extrapleural space, accumulating over the apex of the left lung. **Analysis of Incorrect Options:** * **B. Cystic hygroma:** These are lymphatic malformations typically found in the neck (posterior triangle) or axilla. While they can extend into the superior mediastinum, they present as soft tissue masses rather than a classic apical cap. * **C. Castleman's disease:** This is a rare lymphoproliferative disorder. On imaging, it usually presents as a solitary, intensely enhancing mediastinal nodal mass or diffuse lymphadenopathy, not an apical cap. * **D. Sarcoidosis:** The hallmark radiological finding in sarcoidosis is bilateral hilar and paratracheal lymphadenopathy (Garland’s triad/1-2-3 sign), often accompanied by interstitial lung disease. **High-Yield Clinical Pearls for NEET-PG:** * **Aortic Dissection Signs on CXR:** Widened mediastinum (>8 cm), blurring of the aortic knob, tracheal deviation to the right, and the "Calcium sign" (intimal calcium displaced >1 cm from the outer aortic wall). * **Differential for Apical Cap:** While dissection is the "emergency" cause, benign causes include apical pleural scarring (due to old TB or radiation) and Pancoast tumors (though these are usually masses rather than thin caps). * **Left vs. Right:** An apical cap in aortic trauma is almost always on the **left** side.

Q: The Ellis curve is characteristic of which of the following conditions?

Pleural effusion. **Explanation:** The **Ellis Curve** (also known as the Damoiseau-Ellis line) is a classic radiological sign seen on a chest X-ray in patients with a **moderate-sized, free-flowing pleural effusion**. [1] **Why it occurs:** In a pleural effusion, fluid accumulates in the pleural space. Due to the negative intrapleural pressure and the natural elastic recoil of the lungs, the fluid is pulled higher along the lateral chest wall than it is medially. This creates a characteristic **S-shaped, upward-curving, convex line** that is highest at the axilla and slopes downward toward the spine. **Analysis of Incorrect Options:** * **A. Pneumothorax:** Characterized by a "hyper-lucent" area with an absent lung vascular marking and a visible **visceral pleural line**. It does not form a curved fluid meniscus. * **C. Pneumonia:** Typically presents as **consolidation** with air bronchograms. [1] While it can be associated with a parapneumonic effusion, the consolidation itself does not form an Ellis curve. [2] * **D. Asthma:** Primarily a clinical diagnosis. Radiologically, it may show **hyperinflation** (flattened diaphragms, increased retrosternal space) but no fluid-related curves. [1] **NEET-PG High-Yield Pearls:** * **Minimum fluid for detection:** Approximately 200–300 ml is required to see blunting of the costophrenic angle on a PA view, but as little as 50 ml can be seen on a **Lateral Decubitus** view (the most sensitive position). * **Loculated effusion:** If the fluid is trapped by adhesions, it will not form an Ellis curve; instead, it appears as a D-shaped opacity. * **Massive effusion:** Causes a complete "white-out" of the hemithorax with a **mediastinal shift to the opposite side**.

Q: The 'Turkish Sword' appearance is a radiological finding of which of the following conditions?

Congenital Veno-Lobar Syndrome. **Explanation:** The **'Turkish Sword'** or **'Scimitar' sign** is the classic radiological hallmark of **Scimitar Syndrome**, which is a component of **Congenital Veno-Lobar Syndrome**. **1. Why the correct answer is right:** Congenital Veno-Lobar Syndrome (Scimitar Syndrome) is characterized by **partial anomalous pulmonary venous return (PAPVR)**. In this condition, an abnormal pulmonary vein drains the entire or part of the right lung into the inferior vena cava (IVC). On a frontal chest X-ray, this anomalous vein appears as a curved, radio-opaque shadow descending vertically toward the diaphragm, resembling a curved Middle Eastern sword (Scimitar or Turkish Sword). It is often associated with right lung hypoplasia and dextroposition of the heart. **2. Why the incorrect options are wrong:** * **Pleuro-pericardial cyst:** Typically presents as a well-defined, water-density mass at the **right cardiophrenic angle**. It does not produce a vertical vascular shadow. * **Small VSD:** Usually presents with a normal chest X-ray or mild cardiomegaly with increased pulmonary vascular markings (plethora), but no specific "sword-like" vascular anomaly. * **Endomyocardial fibrosis:** Characterized by apical obliteration and massive atrial enlargement (especially the right atrium), often leading to a "box-shaped" or globular heart, but not the Scimitar sign. **Clinical Pearls for NEET-PG:** * **Components of Scimitar Syndrome:** Right lung hypoplasia, PAPVR to the IVC, and systemic arterial supply to the right lung (usually from the abdominal aorta). * **Association:** Often associated with **atrial septal defects (ASD)**. * **Dextroposition vs. Dextrocardia:** In this syndrome, the heart is pushed/pulled to the right due to lung hypoplasia (dextroposition), rather than a true reversal of the heart's base-apex axis (dextrocardia).

Q: The "water lilly sign" on a chest X-ray is characteristic of which condition?

Sarcoidosis. ### Explanation The **Water Lily Sign** (also known as the Camelot sign) is a classic radiological finding pathognomonic for a **Hydatid cyst** (caused by *Echinococcus granulosus*). **Wait, there is a discrepancy in the provided key:** While the prompt indicates **Sarcoidosis** as the correct option, in standard medical literature and NEET-PG high-yield facts, the Water Lily sign is exclusively associated with **Echinococcus (Option B)**. #### Why Echinococcus is the correct clinical association: The sign occurs when a pulmonary hydatid cyst ruptures. The endocyst (inner membrane) collapses and floats on the surface of the remaining fluid within the pericyst (outer host-derived layer). On a chest X-ray or CT, this appears as undulating membranes floating on a fluid level, resembling a water lily. #### Analysis of Options: * **B. Echinococcus (Correct Clinical Fact):** This is the definitive cause. Rupture leads to the "Water Lily" appearance. * **D. Sarcoidosis (Incorrect):** Sarcoidosis typically presents with bilateral hilar lymphadenopathy (1-2-3 sign or Garland’s triad) and interstitial lung disease, not floating membranes in a cyst. * **A. Pulmonary Hypoplasia:** Characterized by a small hemithorax and mediastinal shift; it does not present with cystic floating membranes. * **C. Pneumonia:** Usually presents as consolidation or air bronchograms. While a lung abscess (a complication) can show an air-fluid level, it lacks the characteristic floating endocyst membrane. #### NEET-PG High-Yield Pearls: * **Hydatid Cyst Signs:** * *Meniscus sign/Crescent sign:* Air between the pericyst and exocyst. * *Water Lily sign:* Floating collapsed endocyst. * **Treatment of choice:** PAIR (Puncture, Aspiration, Injection, Re-aspiration) or surgical excision, usually covered by Albendazole. * **Common Site:** Liver is the most common site overall, but the lung is the second most common.

Q: All are true about thymus swelling except:

Shift of trachea on X-ray. The thymus is a soft, lymphoid organ located in the anterior mediastinum, most prominent in infants and young children. Understanding its radiological characteristics is crucial for differentiating normal physiological enlargement from pathological masses. ### **Why "Shift of trachea" is the Correct Answer (The Exception)** The normal thymus is a **soft, pliable structure**. Even when enlarged (physiological or reactive hyperplasia), it conforms to the surrounding structures rather than compressing them. Therefore, a thymic swelling **does not cause a mass effect**; it will not displace the trachea or compress the great vessels. If tracheal deviation is present, a clinician should suspect a firmer mass like a lymphoma, germ cell tumor, or neuroblastoma. ### **Analysis of Other Options** * **Widening of mediastinum (A):** In infants, the thymus is the most common cause of a wide superior mediastinum on a chest X-ray. This is a normal finding up to the age of 2 years. * **Sail-like appearance (B):** This is a classic radiological sign (the **"Thymic Sail Sign"**). The thymus often has a sharp, triangular lateral border, usually on the right side, resembling the sail of a boat. * **Steroid administration (C):** The thymus is highly sensitive to corticosteroids. During periods of acute stress or exogenous steroid administration, the thymus undergoes rapid involution (shrinkage). It may later exhibit "rebound hyperplasia" once the stressor is removed. ### **High-Yield Clinical Pearls for NEET-PG** * **Wave Sign (Mulvey’s Sign):** The soft thymus shows indentations from the overlying ribs, creating a wavy contour on X-ray. * **Age Factor:** The thymus is largest at puberty but most visible on X-ray in the first 2 years of life. It undergoes fatty infiltration (involution) in adults. * **DiGeorge Syndrome:** Characterized by **thymic aplasia** (absent thymic shadow on X-ray) along with hypocalcemia and cardiac defects.

Q: Split Pleura sign is seen in which of the following conditions?

Pleural empyema. **Explanation:** The **Split Pleura Sign** is a classic and highly specific CT finding for **Pleural Empyema**. It occurs when the parietal and visceral pleura become thickened and separated by a collection of infected fluid. On contrast-enhanced CT, both layers of the pleura enhance intensely, creating the appearance of two distinct "split" layers surrounding the hypodense fluid collection. **Analysis of Options:** * **Pleural Empyema (Correct):** The presence of pus in the pleural space triggers an inflammatory response, leading to the thickening and enhancement of both pleural layers. This sign helps differentiate empyema from a simple parapneumonic effusion. * **Lung Abscess:** This is an intraparenchymal collection. Unlike empyema, an abscess typically has thick, irregular walls, forms an acute angle with the chest wall, and destroys the lung parenchyma (vessels and bronchi end abruptly at the cavity). * **Pleural Fibroma:** Also known as a Solitary Fibrous Tumor of the Pleura, this is a localized soft tissue mass. It does not typically cause the diffuse, uniform splitting of pleural layers seen in empyema. * **Dressler Syndrome:** This is a post-myocardial infarction syndrome characterized by pericarditis and pleuritis. While it causes pleural effusion, it rarely leads to the significant pleural thickening required to produce the split pleura sign. **High-Yield Pearls for NEET-PG:** * **CT is the gold standard** for identifying the split pleura sign. * **Empyema vs. Abscess:** Empyema displaces adjacent vessels/bronchi (compression), whereas an abscess destroys them. * **Other features of Empyema:** Lenticular (biconvex) shape and extrapleural fat stranding. * The split pleura sign can also occasionally be seen in **pleurodesis** or **chronic hemothorax**, but empyema is the most common association in exams.

Q: What is the first differential diagnosis for a 50-year-old patient presenting with a cough for two weeks, based on chest X-ray findings?

Round pneumonia. ***Round pneumonia*** - A **round, well-defined spherical opacity** on chest X-ray in a patient with **acute cough** for two weeks strongly suggests round pneumonia, which is a localized consolidation that appears spherical. - Most commonly caused by **Streptococcus pneumoniae** and presents with **acute respiratory symptoms**, making it the first differential in this clinical scenario. *Lung abscess* - Typically shows **cavitation with air-fluid levels** on chest X-ray, not a solid round opacity. - Usually presents with **prolonged illness**, **foul-smelling sputum**, and **systemic toxicity** rather than just a two-week cough. *Asbestosis (coin lesion)* - Shows **bilateral lower lobe interstitial changes** with **pleural plaques**, not a single round opacity. - Requires **occupational asbestos exposure** history and presents with **progressive dyspnea** over years, not acute cough. *Pulmonary hamartoma* - Appears as a **chronic, asymptomatic** lesion with characteristic **popcorn calcification** on CT scan. - Patients are typically **asymptomatic** without acute respiratory symptoms like cough.

Q: The "flat waist sign" is characteristically seen in which of the following conditions?

Left lower lobe collapse. **Explanation:** The **"Flat Waist Sign"** is a classic radiological sign of **Left Lower Lobe (LLL) collapse**. **1. Why Left Lower Lobe Collapse is Correct:** In a normal chest X-ray, the left heart border has a characteristic "waist" formed by the concavity between the aortic arch, the pulmonary artery, and the left ventricle. When the left lower lobe collapses, it displaces posteriorly and medially. This causes the **heart to rotate posterolaterally** and the mediastinum to shift slightly. This rotation flattens the normal concavity of the left heart border, resulting in a straight or "flat" appearance—the Flat Waist Sign. **2. Why the Other Options are Incorrect:** * **Right Upper Lobe (RUL) Collapse:** Characterized by the **Golden S-sign** (due to a central mass) and upward displacement of the horizontal fissure. * **Right Middle Lobe (RML) Collapse:** Best seen on a lateral view as a wedge-shaped opacity; on PA view, it causes **blurring of the right heart border** (Silhouette sign). * **Left Upper Lobe (LUL) Collapse:** Characterized by the **Luftsichel sign** (a crescent of air around the aortic arch) and anterior displacement of the major fissure. **3. High-Yield Clinical Pearls for NEET-PG:** * **Luftsichel Sign:** Pathognomonic for Left Upper Lobe collapse. * **Golden S-Sign:** Suggests a central obstructing mass causing lobe collapse (usually RUL). * **Sail Sign:** Seen in Left Lower Lobe collapse (the collapsed lobe forms a triangular opacity behind the heart) or as a normal finding in the pediatric thymus. * **Silhouette Sign:** Loss of the heart border or diaphragm contour helps localize which lobe is involved (e.g., loss of right heart border = RML).

Question 1

What is the initial diagnostic imaging modality of choice for suspected bronchiectasis?

Accepted Answer

High-resolution computed tomography (HRCT) scan

Answer

Spiral CT

Answer

Bronchoscopy

Answer

Pulmonary angiography

Question 2

Pulmonary thromboembolism on V-Q scan is suggested by:

Accepted Answer

Perfusion defect with normal ventilation

Answer

Ventilation defect with normal perfusion

Answer

Perfusion defect with ventilation defect

Answer

Normal perfusion and ventilation

Question 3

Which condition classically presents with an 'apical cap' on a chest X-ray?

Accepted Answer

Dissecting aneurysm

Answer

Cystic hygroma

Answer

Castleman's disease

Answer

Sarcoidosis

Question 4

The Ellis curve is characteristic of which of the following conditions?

Accepted Answer

Pleural effusion

Answer

Pneumothorax

Answer

Pneumonia

Answer

Asthma

Question 5

The 'Turkish Sword' appearance is a radiological finding of which of the following conditions?

Accepted Answer

Congenital Veno-Lobar Syndrome

Answer

Pleuro-pericardial cyst

Answer

Small Ventricular Septal Defect (VSD)

Answer

Endomyocardial fibrosis

Question 6

The "water lilly sign" on a chest X-ray is characteristic of which condition?

Accepted Answer

Sarcoidosis

Answer

Pulmonary hypoplasia

Answer

Echinococcus

Answer

Pneumonia

Question 7

All are true about thymus swelling except:

Accepted Answer

Shift of trachea on X-ray

Answer

Widening of mediastinum on X-ray

Answer

Sharp border with sail-like appearance

Answer

Steroid administration reduces size of swelling

Question 8

Split Pleura sign is seen in which of the following conditions?

Accepted Answer

Pleural empyema

Answer

Lung abscess

Answer

Pleural fibroma

Answer

Dressler syndrome

Question 9

What is the first differential diagnosis for a 50-year-old patient presenting with a cough for two weeks, based on chest X-ray findings?

Accepted Answer

Round pneumonia

Answer

Lung abscess

Answer

Asbestosis (coin lesion)

Answer

Pulmonary hamartoma

Question 10

The "flat waist sign" is characteristically seen in which of the following conditions?

Accepted Answer

Left lower lobe collapse

Answer

Right upper lobe collapse

Answer

Right middle lobe collapse

Answer

Left upper lobe collapse

Chest Radiology — MCQs

Chest Radiology — MCQs

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