Chest Radiology Practice Questions

Q: What condition is characterized by a 'signet ring appearance' on CT?

Bronchiectasis. ### Explanation The **'Signet Ring Sign'** is the classic radiological hallmark of **Bronchiectasis** on High-Resolution Computed Tomography (HRCT). **1. Why Bronchiectasis is correct:** In a healthy lung, the internal diameter of a bronchus is roughly equal to the diameter of its accompanying pulmonary artery (broncho-arterial ratio ≈ 1). In bronchiectasis, there is permanent abnormal dilation of the airways. When the CT slice cuts perpendicular to these structures, the **dilated bronchus** (the "ring") appears much larger than the **adjacent small pulmonary artery** (the "diamond" or "signet"), creating the appearance of a signet ring. **2. Why the other options are incorrect:** * **Bronchitis:** This is a clinical diagnosis characterized by airway inflammation and mucus production. While it may show non-specific bronchial wall thickening, it does not cause the permanent dilation required to form a signet ring. * **Emphysema:** Characterized by the destruction of alveolar walls and permanent enlargement of airspaces *distal* to the terminal bronchioles. It appears as areas of low attenuation (lucency) without visible walls, not as dilated rings. * **Bronchogenic Carcinoma:** Typically presents as a focal mass, nodule, or secondary signs like post-obstructive atelectasis. It does not manifest as diffuse airway dilation. **3. NEET-PG High-Yield Pearls:** * **HRCT** is the gold standard investigation for Bronchiectasis. * **Other HRCT signs of Bronchiectasis:** * **Tram-track sign:** Parallel thickened walls of dilated bronchi (seen when imaged longitudinally). * **Lack of tapering:** Bronchi maintain their diameter as they move toward the periphery. * **Finger-in-glove sign:** Seen when dilated bronchi are impacted with mucus. * **Kartagener Syndrome:** A common MCQ association involving the triad of Bronchiectasis, Situs Inversus, and Sinusitis.

Q: Continuous diaphragm sign is seen in which of the following conditions?

Pneumomediastinum. ### Explanation **Correct Answer: A. Pneumomediastinum** **The Concept:** The **Continuous Diaphragm Sign** is a classic radiographic feature of **pneumomediastinum**. Under normal physiological conditions, the central portion of the diaphragm is obscured on a chest X-ray because it is in direct contact with the heart (both have soft tissue density), creating a silhouette effect. In pneumomediastinum, air escapes into the space between the pericardium and the diaphragm. This air provides a low-density contrast that outlines the entire superior surface of the diaphragm, making it visible as a continuous line from one costophrenic angle to the other, passing beneath the heart. **Analysis of Incorrect Options:** * **B. Pseudopneumomediastinum:** This refers to artifacts (like the Mach band effect) or skin folds that mimic air in the mediastinum but do not show a true continuous diaphragm. * **C. Pleural Effusion:** This typically causes "blunting" of the costophrenic angles and obscures the diaphragm rather than making it more visible. * **D. Pulmonary Infarct:** This usually presents as a wedge-shaped opacity (Hampton’s Hump) in the lung periphery and does not involve air collection under the heart. **High-Yield Clinical Pearls for NEET-PG:** * **Other signs of Pneumomediastinum:** * **Spinnaker Sail Sign:** Air displacing the thymus (seen in neonates). * **Ring-around-the-artery sign:** Air outlining the pulmonary artery. * **Naclerio’s V sign:** Air between the descending aorta and the left hemidiaphragm (often seen in Boerhaave syndrome). * **Differentiating Pneumoperitoneum:** In pneumoperitoneum, air is *below* the diaphragm (Cupola sign), whereas in pneumomediastinum, the air is *above* the diaphragm but below the heart.

Q: What condition is characterized by conglomerate nodules seen on chest X-ray?

Silicosis. ### Explanation **Correct Answer: C. Silicosis** **Silicosis** is a fibrotic pneumoconiosis caused by the inhalation of crystalline silica. The hallmark radiological finding is the presence of small, well-defined nodules (2–5 mm) predominantly in the **upper lobes**. As the disease progresses to **Progressive Massive Fibrosis (PMF)**, these small nodules coalesce to form **conglomerate nodules** (large opacities >1 cm). These masses typically migrate toward the hila, leaving compensatory emphysema at the lung bases. **Why other options are incorrect:** * **Hypersensitivity Pneumonitis:** Typically presents with poorly defined centrilobular ground-glass nodules or a "headcheese sign" (mosaic attenuation) on CT. It does not typically form large conglomerate masses. * **Sarcoidosis:** While it features perilymphatic nodules and can lead to fibrosis, its classic radiological hallmark is **bilateral hilar lymphadenopathy** (Stage I) and the "Galaxy Sign" (a central nodule surrounded by tiny satellite nodules). * **Lobar Pneumonia:** Presents as a homogenous **consolidation** involving an entire lobe with air bronchograms, rather than discrete or conglomerate nodules. **High-Yield Clinical Pearls for NEET-PG:** * **Eggshell Calcification:** Calcification of the periphery of hilar lymph nodes is highly characteristic of Silicosis. * **Occupational History:** Look for keywords like "sandblasting," "mining," "stone cutting," or "pottery." * **TB Association:** Silicosis significantly increases the risk of Tuberculosis (**Silicotuberculosis**) because silica impairs alveolar macrophage function. * **PMF Differential:** Progressive Massive Fibrosis is also seen in Coal Worker’s Pneumoconiosis (CWP).

Q: All of the following are indirect radiologic signs of lung collapse EXCEPT?

Obscured contralateral hemidiaphragm. **Explanation:** In chest radiology, signs of lung collapse (atelectasis) are categorized into **Direct** and **Indirect** signs. Understanding this distinction is crucial for NEET-PG. **1. Why "Obscured contralateral hemidiaphragm" is the correct answer:** This is not a sign of collapse. In lung collapse, the volume loss occurs on the **ipsilateral** (same) side. Therefore, any diaphragmatic changes—such as elevation or obscuration (due to the Silhouette sign)—would occur on the **affected side**, not the contralateral side. In fact, the contralateral lung often shows **compensatory hyperinflation**, making the contralateral diaphragm appear clearer or more depressed, rather than obscured. **2. Analysis of Indirect Signs (Incorrect Options):** Indirect signs are compensatory mechanisms or secondary shifts resulting from the loss of volume in the affected lobe/lung: * **Mediastinal displacement (Option A):** The mediastinum shifts **towards** the side of collapse to fill the vacant space. * **Hilar displacement (Option B):** This is the **most sensitive indirect sign**. The hilum moves superiorly (upper lobe collapse) or inferiorly (lower lobe collapse). * **Rib crowding (Option C):** As the lung volume decreases, the intercostal spaces narrow on the affected side, leading to "crowding" of the ribs. **Clinical Pearls for NEET-PG:** * **Direct Sign:** The only direct sign of collapse is the **displacement of interlobar fissures**. * **Golden S Sign (S-curve of Golden):** Seen in Right Upper Lobe collapse due to a central mass; it is a high-yield radiological sign. * **Luftsichel Sign:** A crescent of air seen in Left Upper Lobe collapse, representing the hyperinflated superior segment of the left lower lobe. * **Veil Sign:** A hazy opacification seen in Left Upper Lobe collapse.

Q: All of the following are true about Kerley B lines except:

Runs from the hilar area to the peripheral lung. **Explanation:** Kerley B lines are a classic radiologic sign of pulmonary edema. The correct answer is **B** because it describes the characteristics of **Kerley A lines**, not Kerley B lines. **1. Why Option B is the Correct Answer (The Exception):** Kerley B lines are short (1–2 cm), thin, **peripheral** lines located at the lung bases. They are oriented perpendicular to the pleural surface. In contrast, **Kerley A lines** are longer (2–6 cm), radiate from the **hilar area** toward the periphery, and are caused by distension of anastomotic channels between peripheral and central lymphatics. **2. Analysis of Incorrect Options:** * **Option A (Horizontal):** This is a true characteristic. Kerley B lines are horizontal and usually seen in the costophrenic angles. * **Option C (Thickening of interlobular septa):** This is the underlying pathology. When fluid, cells, or connective tissue infiltrate the interlobular septa (which contain lymphatics and veins), they become visible on X-ray. * **Option D (Pulmonary venous hypertension):** This is the most common clinical cause. It is typically seen when the Pulmonary Capillary Wedge Pressure (PCWP) exceeds **18–20 mmHg**, often due to Left Ventricular Failure or Mitral Stenosis. **Clinical Pearls for NEET-PG:** * **Mnemonic (ABC):** * **A** = **A**pex/Hilar (Long lines) * **B** = **B**ases/Peripheral (Short horizontal lines) * **C** = **C**onfident/Reticular (Fine meshwork pattern) * **Differential Diagnosis:** While most common in Congestive Heart Failure (CHF), Kerley B lines can also be seen in Lymphangitis Carcinomatosa, Sarcoidosis, and Asbestosis. * **Bat-wing Opacity:** Represents alveolar edema (perihilar), whereas Kerley lines represent interstitial edema.

Q: Miliary shadow on chest X-ray is not seen in which of the following conditions?

COPD. **Explanation:** A **miliary pattern** on a chest X-ray is characterized by numerous small, discrete, rounded opacities (typically 1–3 mm in size) distributed uniformly throughout both lung fields. This pattern represents a hematogenous or lymphatic spread of disease. **Why COPD is the correct answer:** COPD (Chronic Obstructive Pulmonary Disease), which includes chronic bronchitis and emphysema, is characterized by **hyperinflation**, flattened diaphragms, increased retrosternal airspace, and pruning of peripheral vessels. It is an obstructive airway disease and does not produce micronodular interstitial shadows. Therefore, it does not present with a miliary pattern. **Analysis of incorrect options:** * **Tuberculosis (C):** This is the classic cause of a miliary pattern. It occurs due to the hematogenous dissemination of *Mycobacterium tuberculosis*. * **Pneumoconiosis (A):** Occupational lung diseases, particularly **Silicosis** and Coal Worker’s Pneumoconiosis, frequently present with diffuse micronodular opacities that mimic a miliary pattern. * **Sarcoidosis (B):** Stage II sarcoidosis often presents with a micronodular distribution (often with a perilymphatic predilection) along with bilateral hilar lymphadenopathy. **Clinical Pearls for NEET-PG:** * **Mnemonic for Miliary Shadows (MIST):** **M**iliary TB, **I**diopathic Pulmonary Fibrosis (early), **S**ilicoses/Sarcoidosis, **T**ropical Eosinophilia/Tumor (Metastases like Thyroid or Renal Cell Carcinoma). * **Miliary TB vs. Silicosis:** In Silicosis, nodules are often harder and may show "Eggshell calcification" of hilar nodes, whereas Miliary TB nodules are uniform and soft. * **Most common cause** of miliary shadows in India is **Tuberculosis**.

Q: Which of the following conditions does NOT cause a thick cavity in the lung?

Emphysema. In pulmonary imaging, a **thick-walled cavity** is generally defined as having a wall thickness greater than 4 mm, often associated with inflammation, infection, or malignancy. **Why Emphysema is the correct answer:** Emphysema is characterized by the permanent enlargement of airspaces distal to the terminal bronchioles due to the destruction of alveolar walls. This process results in **bullae** or **blebs**. These are thin-walled (typically <1 mm), air-filled spaces. They do not form "thick" cavities because the underlying pathology is tissue loss and hyperinflation, not an infiltrative or necrotizing process. **Analysis of incorrect options:** * **Lung Abscess:** This is a classic cause of a thick-walled cavity [1]. It typically presents with a thick, irregular wall often containing an **air-fluid level** due to liquefactive necrosis. * **Tuberculosis (TB):** Secondary (reactivation) TB commonly causes cavitation, especially in the apical segments [1]. These cavities are usually thick-walled due to caseous necrosis and surrounding granulomatous inflammation. * **Hamartoma:** While typically presenting as a "coin lesion" with characteristic **popcorn calcification**, large hamartomas can occasionally undergo central necrosis or cystic changes, leading to the appearance of a thick-walled lesion on imaging. **NEET-PG High-Yield Pearls:** 1. **Wall Thickness Rule:** Cavities with walls 15 mm are highly suspicious for malignancy (Squamous Cell Carcinoma). 2. **Air-fluid level:** Most commonly seen in lung abscesses and infected hydatid cysts. 3. **Monod Sign:** An air crescent seen in a cavity, classic for an **Aspergilloma** (fungal ball) occupying a pre-existing TB cavity [1]. 4. **Common causes of thick cavities (Mnemonic: CAVITY):** **C**ancer (Squamous cell), **A**utoimmune (Wegener’s), **V**ascular (Infarct) [1], **I**nfection (TB/Abscess), **T**rauma, **Y**outh (CPAM).

Q: Which of the following findings on a CT scan is indicative of active pulmonary tuberculosis?

Tree in bud appearance. **Explanation:** **1. Why "Tree-in-bud" is correct:** The **tree-in-bud appearance** is a classic CT finding representing **active endobronchial spread** of infection. It consists of small, peripheral, soft-tissue centrilobular nodules connected to linear branching structures. Pathologically, this represents the impaction of the distal airways (bronchioles) with pus, mucus, or inflammatory debris. While not pathognomonic for TB, in the context of a patient with constitutional symptoms, it is highly suggestive of **active pulmonary tuberculosis**. **2. Why the other options are incorrect:** * **Honeycomb appearance:** This refers to clustered cystic air spaces with thick walls, typically seen in the subpleural regions. It is the hallmark of **End-stage Interstitial Lung Disease (ILD)** or Usual Interstitial Pneumonia (UIP), representing irreversible fibrosis. * **Ground glass appearance:** This is a non-specific finding of increased lung attenuation where underlying vessels are still visible. It indicates partial filling of alveoli or thickening of the interstitium, commonly seen in **viral pneumonias (like COVID-19)**, pulmonary edema, or early stages of hypersensitivity pneumonitis. * **Signet ring sign:** This occurs when the internal diameter of a bronchus is larger than its accompanying pulmonary artery. It is the classic radiological sign of **Bronchiectasis**. **3. High-Yield Clinical Pearls for NEET-PG:** * **Ghon Complex:** A combination of a parenchymal lesion (Ghon focus) and ipsilateral involvement of a lymph node. * **Ranke Complex:** A healed, calcified Ghon complex. * **Miliary TB:** Characterized by 1–3 mm "millet-sized" nodules randomly distributed throughout both lungs. * **Reactivation TB:** Most commonly involves the **apical and posterior segments** of the upper lobes.

Q: A soft tissue mass in the chest with rib erosion in X-ray is seen in all except?

Leukemia. **Explanation:** The presence of a **soft tissue mass associated with rib erosion** on a chest X-ray typically indicates a primary bone tumor or a plasma cell dyscrasia that directly destroys the cortical bone as it expands into the surrounding tissue. **1. Why Leukemia is the Correct Answer:** Leukemia is a hematological malignancy of the bone marrow. While it can cause generalized osteopenia, lytic lesions (rarely), or periosteal reactions in children, it **does not typically present as a focal soft tissue mass with localized rib erosion.** In the chest, leukemia more commonly presents with mediastinal lymphadenopathy or pleural effusions rather than primary rib destruction. **2. Analysis of Incorrect Options:** * **Ewing’s Sarcoma:** This is a common primary bone tumor in children/young adults. When it involves the ribs (Askin tumor), it characteristically presents with a large, aggressive soft tissue mass and extensive rib destruction/erosion. * **Multiple Myeloma:** This is the most common primary bone malignancy in adults. It causes "punched-out" lytic lesions. A plasmacytoma (localized myeloma) frequently presents as an expansile rib lesion with an associated soft tissue component. * **Osteosarcoma:** Although more common in long bones, when it occurs in the ribs, it presents as a destructive bony lesion with a significant soft tissue mass, often showing osteoid matrix mineralization (sunburst appearance). **Clinical Pearls for NEET-PG:** * **Askin Tumor:** A primitive neuroectodermal tumor (PNET) of the chest wall, belonging to the Ewing’s family; look for a giant chest wall mass in a child. * **Most common cause of rib destruction:** Metastatic disease (e.g., Lung, Breast, Prostate) is more common than primary bone tumors. * **Multiple Myeloma:** Always consider this in an elderly patient with "punched-out" rib lesions and a soft tissue mass.

Q: A boot-shaped heart on a chest X-ray is characteristic of which congenital heart defect?

Tetralogy of Fallot. **Explanation:** The **boot-shaped heart** (also known as **"Coeur en Sabot"**) is the classic radiological sign for **Tetralogy of Fallot (TOF)**. This specific morphology occurs due to two primary anatomical changes: 1. **Right Ventricular Hypertrophy (RVH):** The pressure overload causes the right ventricle to enlarge, which lifts the cardiac apex upward and outward. 2. **Pulmonary Hypoplasia:** The narrow right ventricular outflow tract (pulmonary stenosis) results in a small, concave pulmonary artery segment (the "waist" of the heart), accentuating the boot appearance. **Analysis of Incorrect Options:** * **Transposition of the Great Arteries (TGA):** Characterized by an **"Egg-on-a-string"** appearance. The narrow mediastinum (due to stress-induced thymic atrophy and the parallel orientation of the great vessels) makes the heart look like an egg hanging by a string. * **Total Anomalous Pulmonary Venous Connection (TAPVC):** Specifically the supracardiac type, it presents with a **"Snowman sign"** or **"Figure-of-8"** appearance due to a dilated vertical vein and superior vena cava. * **Partial Anomalous Pulmonary Venous Connection (PAPVC):** Often associated with **Scimitar Syndrome**, where a curved anomalous vein drains into the IVC, resembling a Turkish sword (Scimitar sign). **High-Yield Clinical Pearls for NEET-PG:** * **TOF Components:** VSD, Overriding of Aorta, Pulmonary Stenosis, and RVH. * **Lung Fields in TOF:** Usually show **oligemia** (decreased vascular markings) due to reduced pulmonary blood flow. * **Box-shaped heart:** Seen in **Ebstein’s Anomaly** (massive right atrial enlargement). * **Sitting Duck sign:** Seen in **Persistent Truncus Arteriosus**.

Question 1

What condition is characterized by a 'signet ring appearance' on CT?

Accepted Answer

Bronchiectasis

Answer

Bronchitis

Answer

Emphysema

Answer

Bronchogenic Carcinoma

Question 2

Continuous diaphragm sign is seen in which of the following conditions?

Accepted Answer

Pneumomediastinum

Answer

Pseudopneumomediastinum

Answer

Pleural effusion

Answer

Pulmonary infarct

Question 3

What condition is characterized by conglomerate nodules seen on chest X-ray?

Accepted Answer

Silicosis

Answer

Hypersensitivity Pneumonitis

Answer

Sarcoidosis

Answer

Lobar Pneumonia

Question 4

All of the following are indirect radiologic signs of lung collapse EXCEPT?

Accepted Answer

Obscured contralateral hemidiaphragm

Answer

Mediastinal displacement

Answer

Hilar displacement

Answer

Rib crowding

Question 5

All of the following are true about Kerley B lines except:

Accepted Answer

Runs from the hilar area to the peripheral lung

Answer

Horizontal

Answer

Due to thickening of interlobular septa

Answer

Due to pulmonary venous hypertension

Question 6

Miliary shadow on chest X-ray is not seen in which of the following conditions?

Accepted Answer

COPD

Answer

Pneumoconiosis

Answer

Sarcoidosis

Answer

Tuberculosis

Question 7

Which of the following conditions does NOT cause a thick cavity in the lung?

Accepted Answer

Emphysema

Answer

Lung abscess

Answer

Tuberculosis

Answer

Hamartoma

Question 8

Which of the following findings on a CT scan is indicative of active pulmonary tuberculosis?

Accepted Answer

Tree in bud appearance

Answer

Honeycomb appearance

Answer

Ground glass appearance

Answer

Signet ring sign

Question 9

A soft tissue mass in the chest with rib erosion in X-ray is seen in all except?

Accepted Answer

Leukemia

Answer

Ewing's sarcoma

Answer

Multiple myeloma

Answer

Osteosarcoma

Question 10

A boot-shaped heart on a chest X-ray is characteristic of which congenital heart defect?

Accepted Answer

Tetralogy of Fallot

Answer

Transposition of the great arteries (TGA)

Answer

Total anomalous pulmonary venous connection (TAPVC)

Answer

Partial anomalous pulmonary venous connection (PAPVC)

Chest Radiology — MCQs

Chest Radiology — MCQs

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