Chest Radiology — MCQs

A 60-year-old chronic smoker presents with weight loss, cough, and hemoptysis. A chest radiograph revealed a specific appearance. The patient subsequently developed gradually progressive left upper limb pain, paresthesia, and weakness. He also developed left-sided Horner's syndrome. What is the most likely diagnosis?

Q235Easy

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

Q236Medium

A 57-year-old recently retired demolitions worker complains of increasing shortness of breath. The patient was a chronic heavy cigarette smoker throughout his adult life but quit about a year before presentation. A chest CT was performed. Which of the following steps is not appropriate in the evaluation of this patient?

Q237Medium

A 48-year-old man is admitted with shortness of breath and signs of left ventricular failure. What is the diagnosis most likely associated with these findings?

Q238Easy

A 43-year-old male undergoing preoperative evaluation for hernia repair is found to have a solitary pulmonary nodule. What is the important radiological feature to suggest its benign nature?

Q239Easy

Which of the following is the most common cause of an anterior mediastinal mass in an 18-year-old male?

Q240Easy

Which of the following is the most common feature of aortitis on chest x-ray?

Chest Radiology Indian Medical PG Practice Questions and MCQs

Question 231: On a chest X-ray, if an 'air bronchogram' is seen within an opacity, what does this finding indicate about the opacity?

A. Extrapleural
B. Intrapleural
C. Intrapulmonary (Correct Answer)
D. Extrapulmonary

Explanation: ### 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.

Question 232: Silhouetting of the left border of the heart on a chest radiograph (silhouette sign positive) indicates which of the following pathologies?

A. Upper lobe consolidation
B. Hilar lymphadenopathy
C. Lingular consolidation (Correct Answer)
D. Lower lobe consolidation

Explanation: **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 233: What condition is characterized by a 'signet ring appearance' on CT?

A. Bronchitis
B. Bronchiectasis (Correct Answer)
C. Emphysema
D. Bronchogenic Carcinoma

Explanation: ### 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.

Question 234: A 60-year-old chronic smoker presents with weight loss, cough, and hemoptysis. A chest radiograph revealed a specific appearance. The patient subsequently developed gradually progressive left upper limb pain, paresthesia, and weakness. He also developed left-sided Horner's syndrome. What is the most likely diagnosis?

A. Fungal ball
B. Pulmonary hydatid cyst
C. Pancoast tumour (Correct Answer)
D. Hamartoma

Explanation: **Explanation:** The clinical presentation is a classic description of **Pancoast syndrome**, typically caused by a **Pancoast tumor** (Superior Sulcus Tumor). These are usually bronchogenic carcinomas (most commonly squamous cell or adenocarcinoma) located at the extreme apex of the lung. **Why Pancoast Tumor is correct:** The tumor’s location allows it to invade surrounding structures, leading to a triad of symptoms: 1. **Brachial Plexus Involvement (C8-T2):** Causes the reported progressive upper limb pain, paresthesia, and weakness (specifically in the distribution of the ulnar nerve). 2. **Cervical Sympathetic Chain Involvement:** Destruction of the paravertebral sympathetic ganglia leads to **ipsilateral Horner’s syndrome** (miosis, ptosis, and anhidrosis). 3. **Radiology:** Typically shows a soft tissue opacity or pleural thickening at the lung apex, often with associated rib destruction. **Why other options are incorrect:** * **Fungal ball (Aspergilloma):** Usually occurs in pre-existing cavities (e.g., old TB). Radiologically shows the "Monod sign" (air crescent). It does not cause Horner’s syndrome or brachial plexopathy. * **Pulmonary hydatid cyst:** Presents as a well-defined "water-lily" sign on imaging. It is a parasitic infection and does not typically invade the apex or nerves. * **Hamartoma:** A benign lung tumor characterized by "popcorn calcification." It is usually asymptomatic and found incidentally. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cell type:** Adenocarcinoma (previously Squamous cell). * **Initial investigation:** Chest X-ray (look for apical cap >5mm or rib erosion). * **Gold standard for staging:** MRI (superior to CT for evaluating brachial plexus and spinal cord invasion). * **Pancoast Syndrome vs. Horner’s:** Pancoast syndrome refers to the clinical constellation of apical tumor, shoulder pain, and Horner’s syndrome.

Question 235: Continuous diaphragm sign is seen in which of the following conditions?

A. Pneumomediastinum (Correct Answer)
B. Pseudopneumomediastinum
C. Pleural effusion
D. Pulmonary infarct

Explanation: ### 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.

Question 236: A 57-year-old recently retired demolitions worker complains of increasing shortness of breath. The patient was a chronic heavy cigarette smoker throughout his adult life but quit about a year before presentation. A chest CT was performed. Which of the following steps is not appropriate in the evaluation of this patient?

A. Positron emission tomography (PET scan)
B. Bronchoscopy
C. Computed tomography-directed biopsy of the lesion
D. Follow-up CT in 3 to 6 months to document stability of the lesion (Correct Answer)

Explanation: **Explanation:** The patient presents with significant risk factors for bronchogenic carcinoma: a heavy smoking history and occupational exposure to dust/demolition (likely involving asbestos). In a high-risk patient with a new pulmonary lesion and symptoms (shortness of breath), the primary goal is to exclude malignancy promptly. **Why Option D is the correct answer (Inappropriate step):** In a high-risk individual (age >50, heavy smoker, occupational exposure), a suspicious pulmonary lesion cannot be managed with "watchful waiting." Following up in 3 to 6 months is inappropriate because it delays the diagnosis of a potentially curable but aggressive lung cancer. Stability over a short period does not definitively rule out malignancy in high-risk groups; active tissue diagnosis or metabolic characterization is required immediately. **Why other options are wrong (Appropriate steps):** * **A. PET Scan:** Useful for characterizing the metabolic activity of the lesion and for staging (detecting nodal or distant metastasis). * **B. Bronchoscopy:** Appropriate for central lesions to obtain brushings, washings, or endobronchial biopsies. * **C. CT-directed biopsy:** The gold standard for obtaining a tissue diagnosis for peripheral lesions to confirm malignancy and determine the histological type (e.g., Adenocarcinoma vs. Squamous cell). **Clinical Pearls for NEET-PG:** * **Fleischner Society Guidelines:** These guide the management of incidental nodules. However, they do not apply to symptomatic patients or those with known primary cancers. * **Asbestos & Smoking:** Asbestos exposure increases lung cancer risk by 5-fold; however, when combined with smoking, the risk increases synergistically by approximately **50-fold**. * **Doubling Time:** Malignant nodules typically have a volume doubling time between 20 and 400 days. Stability for **2 years** on imaging is the classic (though not absolute) indicator of benignity.

Question 237: A 48-year-old man is admitted with shortness of breath and signs of left ventricular failure. What is the diagnosis most likely associated with these findings?

A. A diastolic rumble (Correct Answer)
B. Soft first heart sound
C. Clubbing
D. Koilonychia

Explanation: **Explanation:** The clinical presentation of shortness of breath and left ventricular failure (LVF) in the context of chest radiology often points toward **Mitral Stenosis (MS)**. In MS, the obstruction of blood flow from the left atrium to the left ventricle leads to increased left atrial pressure, pulmonary venous hypertension, and eventually pulmonary edema (visible on X-ray as Kerley B lines, cephalization, and perihilar haze). **Why Option A is correct:** A **diastolic rumble** (specifically a low-pitched mid-diastolic murmur with presystolic accentuation) is the hallmark physical finding of Mitral Stenosis. MS is a leading cause of "pure" left atrial enlargement and secondary pulmonary venous congestion, which manifests as the signs of heart failure described. **Why the other options are incorrect:** * **B. Soft first heart sound:** In Mitral Stenosis, the S1 is typically **loud/accentuated** (due to the leaflets being wide apart at the onset of systole). A soft S1 is more characteristic of Mitral Regurgitation. * **C. Clubbing:** This is associated with chronic hypoxia (Cyanotic Heart Disease), lung abscess, or bronchogenic carcinoma, but not typically with isolated left ventricular failure or mitral valve disease. * **D. Koilonychia:** Spoon-shaped nails are a classic sign of **Iron Deficiency Anemia**, not cardiac failure. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology of MS:** Look for the "Straightening of the left cardiac border" (due to left atrial appendage enlargement) and the "Double atrial shadow" (Right heart border). * **Mitral Facies:** A pinkish-purple patch on the cheeks is a classic sign of severe MS. * **Most common cause:** Rheumatic Heart Disease remains the most common etiology for MS worldwide.

Question 238: A 43-year-old male undergoing preoperative evaluation for hernia repair is found to have a solitary pulmonary nodule. What is the important radiological feature to suggest its benign nature?

A. Large lesion with calcification
B. Irregular shape
C. No calcification
D. 1 cm lesion with uniform calcification (Correct Answer)

Explanation: **Explanation:** The primary goal in evaluating a Solitary Pulmonary Nodule (SPN) is to differentiate between benign and malignant etiologies. Calcification patterns and size are the most reliable radiological predictors of stability. **Why Option D is Correct:** A small lesion (<3 cm) with a **uniform (diffuse), solid calcification pattern** is a hallmark of a benign lesion, most commonly a granuloma (e.g., healed tuberculosis or histoplasmosis). Benign calcification patterns include: 1. **Diffuse/Uniform:** Solidly calcified. 2. **Central:** A dense nidus in the middle. 3. **Laminated/Concentric:** Typical of granulomas. 4. **Popcorn:** Classic for **Pulmonary Hamartoma**. **Analysis of Incorrect Options:** * **Option A (Large lesion):** Size is a significant risk factor; lesions >2 cm have a much higher probability of malignancy. While calcification is usually benign, a large mass still requires cautious evaluation. * **Option B (Irregular shape):** Malignant nodules typically have irregular, **spiculated (corona radiata)**, or lobulated margins due to infiltrative growth. Benign nodules are usually smooth and well-defined. * **Option C (No calcification):** The absence of calcification is a feature of most malignant nodules (though not pathognomonic). A non-calcified nodule in a patient over 40 requires further workup (CT/PET). **NEET-PG High-Yield Pearls:** * **Definition of SPN:** A single, well-circumscribed opacity <3 cm in diameter, surrounded by lung parenchyma, without associated atelectasis or adenopathy. * **Doubling Time:** Malignant nodules typically double in volume every 20–400 days. Stability for **2 years** on serial imaging strongly suggests a benign nature. * **Eccentric Calcification:** Beware! Stippled or eccentric calcification can be seen in malignancies (sequestration of calcium by a growing tumor). * **Management:** The first step in evaluating an incidental SPN is always to **look for old chest X-rays** for comparison.

Question 239: Which of the following is the most common cause of an anterior mediastinal mass in an 18-year-old male?

A. Thymoma (Correct Answer)
B. Ectopic parathyroid gland
C. Aortic aneurysm
D. Lymphoma

Explanation: **Explanation:** The anterior mediastinum is the space between the sternum and the heart/great vessels. The differential diagnosis for an anterior mediastinal mass is traditionally remembered by the **"4 Ts"**: Thymoma, Teratoma (Germ Cell Tumors), Thyroid (Retrosternal Goiter), and "Terrible" Lymphoma. **Why Thymoma is correct:** Among the 4 Ts, **Thymoma** is statistically the most common primary anterior mediastinal mass in adults. While it typically peaks between ages 40–60, it remains the most frequent overall diagnosis in this compartment. In the context of NEET-PG, unless a specific clinical clue points elsewhere (like B-symptoms for lymphoma or elevated AFP/HCG for germ cell tumors), Thymoma is the standard "most common" answer for an anterior mediastinal mass. **Why other options are incorrect:** * **Ectopic parathyroid gland:** While these can occur in the anterior mediastinum (within the thymus), they are rare and usually present as small, functional lesions causing hypercalcemia rather than a large visible mass. * **Aortic aneurysm:** This is a vascular pathology typically located in the **middle or posterior mediastinum** (depending on the segment of the aorta involved). It is not considered a primary mediastinal "mass." * **Lymphoma:** While very common in young adults (especially Hodgkin’s), it is statistically second to thymic epithelial tumors in overall frequency. It usually presents with bulky, lobulated lymphadenopathy and systemic symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Thymoma Association:** 30–50% of patients with thymoma have **Myasthenia Gravis**. Conversely, 15% of patients with Myasthenia Gravis have a thymoma. * **Age Factor:** In children, the most common anterior mass is a **Germ Cell Tumor** or Lymphoma; in older adults, it is Thymoma or Thyroid goiter. * **Imaging:** CT with IV contrast is the gold standard for evaluating the extent and invasion of mediastinal masses.

Question 240: Which of the following is the most common feature of aortitis on chest x-ray?

A. Calcification of the ascending aorta (Correct Answer)
B. Calcification of the descending aorta
C. Calcification of the pulmonary artery
D. Focal oligemia

Explanation: **Explanation:** **Aortitis**, particularly when caused by **Syphilis (Luetic aortitis)**, has a predilection for the proximal aorta. The underlying pathology involves *vasa vasorum* endarteritis, which leads to ischemia of the aortic media, destruction of elastic tissue, and subsequent dystrophic calcification. 1. **Why Option A is correct:** Calcification of the **ascending aorta** is the hallmark radiologic sign of syphilitic aortitis. While atherosclerotic calcification commonly affects the aortic arch and descending aorta, it rarely involves the ascending aorta in isolation. Therefore, seeing a "linear shell" of calcification in the ascending aorta on a chest X-ray is highly specific for aortitis. 2. **Why other options are incorrect:** * **Option B:** Calcification of the **descending aorta** is a very common finding in elderly patients and is typically a sign of routine **atherosclerosis**, not specific to inflammatory aortitis. * **Option C:** Calcification of the **pulmonary artery** is rare and usually associated with long-standing pulmonary arterial hypertension (PAH) or Eisenmenger syndrome, not aortitis. * **Option D:** **Focal oligemia** (Westermark sign) is a classic radiologic sign of **Pulmonary Embolism**, representing decreased vascularity distal to an occluded vessel. **High-Yield Clinical Pearls for NEET-PG:** * **Syphilitic Aortitis:** Most common site is the ascending aorta; can lead to **Aortic Regurgitation** (due to root dilatation) and **Coronary Ostial Stenosis**. * **Tree-barking appearance:** A gross pathological description of the intimal wrinkling seen in syphilitic aortitis. * **Takayasu Arteritis:** Another cause of aortitis ("Pulseless disease") common in young females, but it typically presents with arterial narrowing/stenosis rather than isolated ascending aortic calcification on X-ray.

Practice by Chapter

Normal Chest Radiographic Anatomy

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Radiographic Signs in Chest Imaging

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Pulmonary Infections

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Chronic Obstructive Pulmonary Disease

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Interstitial Lung Diseases

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Pulmonary Neoplasms

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Pleural Diseases

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Mediastinal Pathology

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Congenital and Developmental Chest Anomalies

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Pulmonary Vascular Diseases

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Chest Trauma Imaging

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Post-Surgical Chest Imaging

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