Chest Radiology Practice Questions

Q: Water bottle heart is seen in which of the following conditions?

Pericardial effusion. **Explanation:** **Pericardial effusion** is the correct answer. The "Water Bottle Heart" sign (also known as the "Leather Bottle" or "Flask-shaped" heart) occurs when a large amount of fluid accumulates in the pericardial sac. Due to gravity, the fluid collects in the dependent portions of the pericardium, causing the lower part of the cardiac silhouette to bulge outward while the superior mediastinum remains narrow. This creates a globular, symmetric enlargement of the heart shadow on a Chest X-ray, resembling an old-fashioned water flask. **Why other options are incorrect:** * **Patent Ductus Arteriosus (PDA):** Typically presents with features of left-to-right shunt, leading to left atrial and left ventricular enlargement, along with increased pulmonary vascular markings, rather than a symmetric globular shape. * **Chronic Emphysema:** Characterized by a "Tubular" or "Drip-shaped" heart. The hyperinflated lungs compress the heart and cause the diaphragm to flatten, making the heart appear narrow and elongated. * **Constrictive Pericarditis:** The heart size is usually normal or small. The classic radiological finding is **pericardial calcification** (best seen on a lateral view), not massive enlargement. **High-Yield Pearls for NEET-PG:** * **Minimum fluid for X-ray detection:** At least 200–250 ml of fluid must accumulate before the cardiac silhouette enlarges on a PA view. * **Echocardiography:** This is the gold standard and most sensitive initial investigation for diagnosing pericardial effusion. * **Epicardial Fat Pad Sign:** On a lateral X-ray, a vertical opaque line (pericardial fluid) sandwiched between two radiolucent fat lines (epicardial and paracardial fat) is highly suggestive of effusion. * **Electrical Alternans:** The classic ECG finding associated with a large effusion/tamponade due to the "swinging" of the heart in the fluid.

Q: Westermark's sign, Hampton's hump, and Palla's sign are all characteristic radiological findings suggestive of which condition?

Pulmonary Embolism. **Explanation:** The correct answer is **Pulmonary Embolism (PE)**. While a chest X-ray is often normal in PE (the most common finding being sinus tachycardia on ECG or a normal CXR), specific signs can point toward the diagnosis: 1. **Westermark’s Sign:** Focal oligemia (decreased vascular markings) distal to the occluded pulmonary artery due to mechanical obstruction of blood flow. 2. **Hampton’s Hump:** A wedge-shaped, pleura-based opacification with its apex pointing toward the hilum. This represents pulmonary infarction. 3. **Palla’s Sign:** Enlargement of the right descending pulmonary artery, appearing as a "sausage-shaped" shadow, caused by the presence of a large thrombus. **Why other options are incorrect:** * **Tubercular Pleural Effusion:** Typically presents with a "meniscus sign" (obliteration of costophrenic angles) and may show associated lung parenchymal lesions or hilar lymphadenopathy. * **Acute Pulmonary Edema/LVF:** These present with bilateral, symmetrical findings such as **Kerley B lines**, peribronchial cuffing, "Bat-wing" hilar opacities, and cardiomegaly. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA). * **Most Common CXR Finding:** Normal CXR or non-specific atelectasis/pleural effusion. * **Knuckle Sign:** Similar to Palla’s sign, referring to the abrupt tapering of a pulmonary artery due to an embolus. * **Fleischner Sign:** Prominent central pulmonary artery due to massive PE. * **McConnell's Sign:** A specific **Echocardiographic** finding (RV free wall akinesia with sparing of the apex).

Q: Lucent hemithorax is due to all the following except?

Lung Collapse. ### Explanation **Lucent hemithorax** refers to a chest X-ray finding where one side of the chest appears darker (more radiolucent) than the other. This occurs due to either increased air (hyperinflation), decreased blood flow (oligemia), or chest wall abnormalities. **Why Lung Collapse is the Correct Answer:** Lung collapse (atelectasis) leads to an **opaque (white) hemithorax**, not a lucent one. When a lung collapses, air is resorbed, and the lung tissue becomes dense and solid. This increased density absorbs more X-rays, resulting in a radio-opaque appearance. Additionally, there is an ipsilateral shift of the mediastinum toward the side of the collapse. **Analysis of Incorrect Options:** * **Rotation:** This is a technical artifact. If the patient is rotated, the side further from the film appears more lucent due to the decreased thickness of the chest wall musculature the X-rays must penetrate. * **Swyer-James-McLeod Syndrome:** This is a post-infectious obliterative bronchiolitis. It results in air trapping and reduced vascularity (pruning of vessels) in one lung, leading to a classic hyperlucent hemithorax. * **Foreign Body:** A non-opaque foreign body in a bronchus can act as a **"check-valve,"** allowing air in during inspiration but preventing it from leaving during expiration. This leads to obstructive emphysema and a lucent hemithorax on the affected side. **High-Yield Clinical Pearls for NEET-PG:** * **Macleod’s Syndrome:** Look for a small/normal-sized lung with hyperlucency and decreased vascular markings. * **Poland Syndrome:** A rare cause of lucent hemithorax due to the congenital absence of the pectoralis major muscle. * **Pneumothorax:** A common cause of lucent hemithorax where there is a complete absence of bronchovascular markings. * **Westermark Sign:** Focal peripheral lucency (oligemia) seen in Pulmonary Embolism.

Q: Which of the following is NOT a radiological feature of chronic cor pulmonale?

Prominent lower lobe vessels. **Explanation:** **Cor pulmonale** refers to right ventricular hypertrophy and/or dilation resulting from pulmonary hypertension caused by primary lung disease (e.g., COPD, interstitial lung disease). **Why "Prominent lower lobe vessels" is the correct answer:** In chronic cor pulmonale, pulmonary hypertension leads to **pruning** of the peripheral vasculature. The central pulmonary arteries become dilated (prominent), while the peripheral and lower lobe vessels typically appear **constricted or attenuated** due to increased pulmonary vascular resistance. "Prominent lower lobe vessels" (cephalization) is a classic feature of **Left Heart Failure**, not Cor Pulmonale. **Analysis of Incorrect Options:** * **Kerley B lines:** These represent thickened interlobular septa. While more common in left-sided failure, they can occur in chronic cor pulmonale due to chronic lymphatic congestion or associated interstitial lung disease. * **Pleural effusion:** Chronic right-sided heart failure leads to increased systemic venous pressure, which can impair pleural fluid drainage, resulting in effusions. * **Cardiomegaly:** In chronic cases, right ventricular hypertrophy and subsequent dilation lead to an enlarged cardiac silhouette, often characterized by an "upturned apex" on a PA chest X-ray. **NEET-PG High-Yield Pearls:** * **Westermark Sign:** Focal oligemia distal to a pulmonary embolism (important differential for clear lung fields). * **Fleischner Sign:** Enlarged central pulmonary artery due to pulmonary embolism/hypertension. * **Egg-shell calcification:** Characteristic of Silicosis (a common cause of cor pulmonale). * **Key X-ray finding:** A central pulmonary artery diameter >16 mm is a highly specific indicator of pulmonary hypertension.

Q: What is not a CT finding in bronchiectasis?

Crazy paving appearance. **Explanation:** Bronchiectasis is defined as the permanent, abnormal dilatation of the bronchi. High-Resolution Computed Tomography (HRCT) is the gold standard for diagnosis. **Why "Crazy Paving" is the correct answer:** **Crazy paving appearance** refers to thickened interlobular septa and intralobular lines superimposed on a background of ground-glass opacification. It is a non-specific finding but is classically associated with **Pulmonary Alveolar Proteinosis (PAP)**, Lipoid pneumonia, or ARDS. It is not a feature of bronchiectasis, which primarily involves the airways rather than the alveolar/interstitial space in this specific pattern. **Analysis of other options:** * **Signet ring appearance:** This is the hallmark of bronchiectasis. It occurs when the dilated bronchus is larger than its accompanying pulmonary artery (broncho-arterial ratio >1). * **Tree-in-bud appearance:** This represents impaction of mucus, pus, or fluid in the distal bronchioles. It is frequently seen in infectious etiologies of bronchiectasis (e.g., Tuberculosis or MAC). * **Traction bronchiectasis:** This occurs when surrounding parenchymal **lung fibrosis** pulls the bronchial walls apart, leading to irregular dilatation. It is a common secondary finding in end-stage interstitial lung disease. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** HRCT Chest. * **Types of Bronchiectasis (Reid Classification):** Cylindrical (most common), Varicose, and Cystic (most severe). * **Tram-track signs:** Parallel opacities representing thickened bronchial walls (seen on X-ray and CT). * **Finger-in-glove sign:** Represents mucoid impaction, often seen in Allergic Bronchopulmonary Aspergillosis (ABPA).

Q: A 42-year-old female smoker with a 20-pack-year history is admitted with progressive shortness of breath. On examination, she has distant heart sounds with decreased breath sounds on lung exam bilaterally. No summation gallop is heard. ECG shows low voltage. Chest x-ray findings are shown. Which of the following findings on the chest x-ray may be associated with this presentation?

Positional change of chest x-ray findings. ***Positional change of chest x-ray findings*** - In **large pericardial effusion**, the cardiac silhouette can change shape and position with patient positioning due to fluid redistributing around the heart, creating the **"swinging heart" appearance**. - This finding, combined with **distant heart sounds**, **low voltage ECG**, and bilateral decreased breath sounds in a smoker, strongly suggests a **massive pericardial effusion** compressing surrounding structures. *Pericardial rub on auscultation* - **Pericardial friction rub** is typically heard in **acute pericarditis** when inflamed pericardial layers rub against each other. - In **large pericardial effusions**, the rub is usually **absent** because the fluid separates the pericardial layers, preventing friction. *Hamman's crunch on physical exam* - **Hamman's crunch** is a crepitant sound synchronous with heartbeat, characteristic of **pneumomediastinum** (air in mediastinum). - This finding is associated with **esophageal rupture** or **pneumothorax**, not pericardial effusion, and would not explain the distant heart sounds. *Continuous diaphragm sign on chest x-ray* - The **continuous diaphragm sign** indicates **pneumomediastinum** where air outlines the diaphragm continuously across the mediastinum. - This radiological finding is seen with **air in the mediastinum**, not fluid accumulation in the pericardial space as suggested by this clinical presentation.

Q: The CT chest of the patient shows the presence of which of the following?

Bronchiectasis. ***Bronchiectasis*** - CT chest shows characteristic **signet ring sign** (dilated bronchus with adjacent pulmonary artery) and **tram-track sign** (parallel bronchial walls). - Bronchi demonstrate **lack of normal tapering** and appear dilated with **thickened walls**, often in a cylindrical or varicose pattern. *Pneumatoceles* - Appear as **thin-walled air-filled cysts** within the lung parenchyma, typically following pneumonia or trauma. - Show **smooth, thin walls** without the bronchial pattern or wall thickening seen in bronchiectasis. *Normal scan* - Would show **normal bronchial tapering** with bronchi becoming progressively smaller toward the periphery. - Absence of **bronchial wall thickening**, cystic changes, or abnormal bronchial dilatation patterns. *Loculated empyema* - Presents as **loculated pleural fluid collections** with **enhancing pleural surfaces** on contrast-enhanced CT. - Shows **pleural thickening** and **septations** within the pleural space, not bronchial abnormalities.

Question 1

A 35-year-old patient with a history of asbestos exposure presents with chest pain. An X-ray reveals a solitary pulmonary nodule in the right lower zone. A CECT shows an enhancing nodule adjoining the right lower costal pleura with a comet tail sign and adjacent pleural thickening. What is the most likely diagnosis?

Accepted Answer

Round atelectasis

Answer

Mesothelioma

Answer

Pulmonary sequestration

Answer

Adenocarcinoma

Question 2

Water bottle heart is seen in which of the following conditions?

Accepted Answer

Pericardial effusion

Answer

Patent ductus arteriosus

Answer

Chronic emphysema

Answer

Constrictive pericarditis

Question 3

The "floating water-lily sign" is characteristic of which condition?

Accepted Answer

Lung abscess

Answer

Pulmonary hydatid cyst

Answer

Bronchial adenoma

Answer

Aspergilloma

Question 4

Westermark's sign, Hampton's hump, and Palla's sign are all characteristic radiological findings suggestive of which condition?

Accepted Answer

Pulmonary Embolism

Answer

Tubercular pleural effusion

Answer

Acute Pulmonary edema

Answer

Left ventricular failure

Question 5

Lucent hemithorax is due to all the following except?

Accepted Answer

Lung Collapse

Answer

Rotation

Answer

Swyer-James McLeod Syndrome

Answer

Foreign Body

Question 6

Which of the following is NOT a radiological feature of chronic cor pulmonale?

Accepted Answer

Prominent lower lobe vessels

Answer

Kerley B lines

Answer

Pleural effusion

Answer

Cardiomegaly

Question 7

Bronchography may be dangerous in a patient with which of the following conditions?

Accepted Answer

Iodine sensitivity

Answer

Emphysema

Answer

Bronchiectasis

Answer

All of the above

Question 8

What is not a CT finding in bronchiectasis?

Accepted Answer

Crazy paving appearance

Answer

Tree in bud appearance

Answer

Signet ring appearance

Answer

Traction bronchiectasis with lung fibrosis

Question 9

A 42-year-old female smoker with a 20-pack-year history is admitted with progressive shortness of breath. On examination, she has distant heart sounds with decreased breath sounds on lung exam bilaterally. No summation gallop is heard. ECG shows low voltage. Chest x-ray findings are shown. Which of the following findings on the chest x-ray may be associated with this presentation?

Accepted Answer

Positional change of chest x-ray findings

Answer

Pericardial rub on auscultation

Answer

Hamman's crunch on physical exam

Answer

Continuous diaphragm sign on chest x-ray

Question 10

The CT chest of the patient shows the presence of which of the following?

Accepted Answer

Bronchiectasis

Answer

Pneumatoceles

Answer

Normal scan

Answer

Loculated empyema

Chest Radiology — MCQs

Chest Radiology — MCQs

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