Chest Radiology Practice Questions

Q: Nipple shadows in a chest X-ray characteristically have a sharp:

Lateral margin. **Explanation:** Nipple shadows are a common mimic of pulmonary nodules on a chest X-ray. The characteristic appearance of a nipple shadow is defined by the **Mach band effect** and the tangential orientation of the X-ray beam. **Why the Lateral Margin is correct:** The lateral margin of the nipple is typically surrounded by air, creating a sharp interface with the skin. Because the X-ray beam strikes this interface tangentially, it produces a **well-defined, sharp lateral border**. Conversely, the medial aspect of the nipple gradually blends into the soft tissue of the breast or chest wall, resulting in an ill-defined or "fuzzy" medial margin. This "sharp-lateral, blurred-medial" appearance is a classic radiological sign used to differentiate a nipple shadow from an intrapulmonary lesion. **Analysis of Incorrect Options:** * **Medial Margin:** As noted, the medial side lacks a sharp air-tissue interface, making it appear hazy. * **Superior/Inferior Margins:** While these may occasionally appear somewhat defined, they do not consistently exhibit the characteristic sharpness seen on the lateral edge due to the anatomical contour of the nipple. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Nipple shadows are typically located in the 4th or 5th intercostal spaces, usually lateral to the midclavicular line. * **Symmetry:** They are often bilateral and symmetric, which helps rule out pathology. * **Confirmatory Step:** If a nipple shadow is suspected to be a lung nodule, the next best step is a **repeat X-ray with nipple markers** (e.g., small metallic pellets taped over the nipples). * **Differential Diagnosis:** Always differentiate from "Coin lesions" (e.g., granulomas, hamartomas, or malignancy). A true pulmonary nodule usually has sharp borders all around (360 degrees).

Q: Minimum fluid collection required for radiological detection of pleural effusion in lateral decubitus view is:

25 ml. **Explanation:** The detection of pleural effusion on imaging depends significantly on the patient's position and the sensitivity of the modality used. **Why 25 ml is correct:** The **lateral decubitus view** (with the affected side down) is the most sensitive conventional radiographic projection for detecting small amounts of pleural fluid. In this position, gravity causes the fluid to layer along the dependent chest wall. It can detect as little as **5–25 ml** of fluid. In the context of standard medical examinations like NEET-PG, **25 ml** is the classically accepted threshold for reliable visualization in this view. **Analysis of Incorrect Options:** * **15 ml:** While some modern high-quality films might show traces at this level, 25 ml is the standard academic benchmark for detection. * **35 ml & 45 ml:** These volumes are well above the minimum threshold for a lateral decubitus film. These amounts are still too small to be seen on a standard upright PA view. **High-Yield Clinical Pearls for NEET-PG:** * **USG (Ultrasonography):** The most sensitive bedside tool; can detect as little as **5–10 ml**. * **Lateral Decubitus View:** Detects **25 ml**. * **Lateral View (Upright):** Detects **50–75 ml** (seen as blunting of the posterior costophrenic angle). * **PA View (Upright):** Detects **150–200 ml** (seen as blunting of the lateral costophrenic angle). * **Ellis S-shaped curve:** The characteristic upper border of a moderate-to-large free pleural effusion seen on an upright X-ray.

Q: A young man with tuberculosis presents with massive recurrent hemoptysis. What is the most probable cause?

Bronchial artery. **Explanation:** In the context of chronic inflammatory lung diseases like **Tuberculosis (TB)**, the most common source of massive hemoptysis is the **Bronchial Artery (90% of cases)**. Chronic inflammation leads to the release of angiogenic factors, causing the bronchial arteries (which are part of the high-pressure systemic circulation) to become hypertrophied, dilated, and fragile. In TB, this often manifests as a **Rasmussen aneurysm** (classically involving the pulmonary artery) or, more frequently, as hypervascularity of the bronchial circulation. Because bronchial arteries carry blood at systemic pressure (mean ~90 mmHg) compared to the low-pressure pulmonary system (mean ~15 mmHg), their rupture results in life-threatening, massive hemorrhage. **Analysis of Options:** * **A. Pulmonary Artery:** While a Rasmussen aneurysm (a pseudoaneurysm of the pulmonary artery) is a classic TB complication, it accounts for only ~5-10% of massive hemoptysis cases. * **C & D. Pulmonary Vein / Superior Vena Cava:** These are low-pressure venous systems. While they can be involved in trauma or malignancy, they are rarely the source of massive hemoptysis in inflammatory conditions like TB. **High-Yield Facts for NEET-PG:** * **Definition of Massive Hemoptysis:** Expectoration of >300–600 ml of blood within 24 hours. * **Gold Standard Investigation:** **MDCT Angiography** is the initial investigation of choice to localize the site and source. * **Treatment of Choice:** **Bronchial Artery Embolization (BAE)** is the definitive non-surgical management for stabilizing massive hemoptysis. * **Most common source:** Bronchial arteries (90%); **Non-bronchial systemic arteries** (e.g., intercostal, subclavian) account for the remainder.

Q: What is the most reliable method for diagnosing pulmonary embolism?

Pulmonary angiography. **Explanation:** **1. Why Pulmonary Angiography is Correct:** Pulmonary angiography remains the **"Gold Standard"** and the most reliable method for diagnosing pulmonary embolism (PE). It involves the direct injection of contrast into the pulmonary arteries under fluoroscopy. The definitive diagnostic finding is a **filling defect** or an abrupt "cutoff" of a vessel. While CT Pulmonary Angiography (CTPA) is the first-line investigation in clinical practice due to its non-invasive nature, conventional catheter angiography is the most accurate (highest sensitivity and specificity). **2. Why Other Options are Incorrect:** * **Plain Skiagram (Chest X-ray):** Usually normal or shows non-specific findings (e.g., atelectasis). While specific signs like **Westermark sign** (focal oligemia) or **Hampton’s Hump** (wedge-shaped opacity) exist, they are rare and have low sensitivity. * **Perfusion Scan (V/Q Scan):** This is a screening tool, not a definitive diagnostic one. It is useful when CTPA is contraindicated (e.g., renal failure or pregnancy), but it often yields "intermediate probability" results which require further testing. * **Electrocardiography (ECG):** Most commonly shows sinus tachycardia. The classic **S1Q3T3 pattern** is specific but only seen in about 10-15% of cases (indicative of right heart strain). **3. High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice (IOC):** CT Pulmonary Angiography (CTPA). * **Gold Standard:** Pulmonary Angiography. * **Best Initial Screening Test:** D-Dimer (High negative predictive value; used to rule out PE in low-risk patients). * **Most Common Finding on CXR:** Normal Chest X-ray. * **Most Common ECG Finding:** Sinus Tachycardia.

Q: Which of the following is NOT a radiographic finding of Congestive Heart Failure (CHF)?

Oligemia. **Explanation:** Congestive Heart Failure (CHF) leads to pulmonary venous hypertension and fluid extravasation into the lung parenchyma and pleural space. The radiographic findings follow a predictable sequence based on pulmonary capillary wedge pressure (PCWP). **Why Oligemia is the correct answer:** **Oligemia** refers to a reduction in pulmonary blood volume, appearing as "translucent" or darker lung fields with thin, sparse vessels. This is a hallmark of conditions with decreased pulmonary blood flow, such as **Tetralogy of Fallot (TOF)** or pulmonary embolism, not CHF. In contrast, CHF causes **Pulmonary Hyperemia** and **Cephalization** (redistribution of blood flow to the upper lobes). **Analysis of Incorrect Options:** * **Cardiomegaly:** Usually the earliest sign of CHF (on PA view, Cardiothoracic ratio >0.5). It indicates ventricular enlargement or pericardial effusion. * **Kerley B lines:** These are short (1-2 cm), horizontal peripheral lines at the lung bases, perpendicular to the pleura. They represent thickened interlobular septa due to edema (PCWP 18–22 mmHg). * **Kerley A lines:** Longer (2-6 cm) linear opacities radiating from the hila toward the periphery in the mid and upper zones. They represent distended anastomotic lymphatic channels. **High-Yield Clinical Pearls for NEET-PG:** * **Stages of CHF on CXR:** 1. **Stage I (PCWP 13-18 mmHg):** Cephalization (Antler sign). 2. **Stage II (PCWP 18-25 mmHg):** Interstitial edema (Kerley lines, peribronchial cuffing, hazy hila). 3. **Stage III (PCWP >25 mmHg):** Alveolar edema (**Bat-wing/Butterfly appearance**) and pleural effusions. * **Kerley B lines** are the most common and specific sign of interstitial pulmonary edema.

Q: A patient presents with bilateral hilar lymphadenopathy with eggshell calcification on chest X-ray. What is the most likely diagnosis?

Silicosis. ***Silicosis*** - The presence of **bilateral hilar lymphadenopathy** with **eggshell calcification** is a classic, pathognomonic finding for silicosis. - This pneumoconiosis is caused by inhalation of silica dust, often seen in miners and sandblasters, and typically shows multiple small nodules predominantly in the **upper lung zones**. *Sarcoidosis* - While sarcoidosis is a common cause of **bilateral hilar lymphadenopathy**, the presence of **eggshell calcification** is much less frequent compared to silicosis. - Calcification in sarcoidosis, when it occurs, is more often amorphous or diffuse, not the distinct peripheral rim seen in the image. *Tuberculosis* - Tuberculosis can cause hilar lymphadenopathy, but it is often **unilateral**, and calcification typically occurs in a healed **Ghon complex** as a solid, dense nodule. - The specific pattern of **eggshell calcification** is not a characteristic feature of tuberculosis. *Pneumoconiosis due to asbestos* - Asbestosis characteristically involves the **lower lung zones** and is associated with **pleural plaques**, pleural thickening, and interstitial fibrosis. - Significant hilar lymphadenopathy and **eggshell calcification** are not typical features of asbestos-related lung disease.

Q: A patient with a history of occupational asbestos exposure presents with SOB and fatigue. CXR was done. What is the diagnosis? ![img-18.jpeg](img-18.jpeg)

Asbestosis. ***Asbestosis*** - The chest X-ray demonstrates classic features of asbestosis, including **pleural plaques** (calcifications on the pleura) and diffuse **interstitial fibrosis**, which is most prominent in the **lower lung zones**. - Asbestosis is a type of pneumoconiosis caused by the inhalation of **asbestos fibers**, and these radiographic findings are highly characteristic of long-term exposure. - Note: A diagnostic-quality radiograph clearly showing bilateral calcified pleural plaques and basal interstitial fibrosis, combined with a confirmed history of occupational asbestos exposure, is required to reliably distinguish asbestosis from other chronic pulmonary diseases. *TB* - Tuberculosis typically presents with findings in the **upper lobes** or apical segments of the lungs, such as **cavitations**, consolidation, or a **Ghon complex**. - The diffuse lower lobe interstitial pattern and pleural plaques seen in this image are not features of a typical TB infection. *Silicosis* - Silicosis is a pneumoconiosis that classically affects the **upper lung zones**, presenting as multiple small, rounded opacities that can coalesce into larger masses. - A characteristic finding, though not always present, is **"eggshell calcification"** of the hilar lymph nodes, which is absent here. Pleural plaques are not a typical feature. *Byssinosis* - Byssinosis, or "brown lung disease," is caused by exposure to cotton dust and often presents with a normal chest X-ray or non-specific findings of hyperinflation. - The diagnosis is primarily clinical, based on a history of chest tightness and dyspnea that improves over the work week. It does not cause the distinct pleural and parenchymal changes seen in asbestosis.

Q: Based on the provided chest X-ray images, what is the most likely diagnosis?

Pulmonary Edema. ***Pulmonary Edema*** - The chest X-ray demonstrates diffuse, bilateral opacities with a central, perihilar distribution, creating the classic **"bat wing"** or **"butterfly"** appearance characteristic of pulmonary edema. - This pattern is caused by the accumulation of fluid in the **alveolar spaces**, often secondary to left-sided heart failure (cardiogenic pulmonary edema). *Hydrothorax* - Hydrothorax is a type of **pleural effusion** specifically involving serous fluid. The primary abnormality in the provided image is within the lung **parenchyma**, not the pleural space. - A significant hydrothorax would present as a homogenous opacification in the dependent parts of the lung with a **meniscus sign**, which is not the dominant feature here. *Pleural Effusion* - A pleural effusion is fluid in the **pleural space**, which would cause **blunting of the costophrenic angles** and a meniscus-shaped opacity. While a small effusion may be present, the main finding is the extensive **alveolar infiltrates**. - The central distribution of opacities seen in the image is not typical for an isolated pleural effusion, which collects in the most dependent areas. *Pulmonary Fibrosis* - Pulmonary fibrosis is a chronic condition that appears as **reticular opacities**, **honeycombing**, and lung volume loss on X-ray, which are signs of **interstitial scarring**. - The image shows acute **airspace (alveolar) opacities**, not the chronic interstitial changes typical of fibrosis.

Q: A chest X-ray is shown below. What is the most likely diagnosis?

Pulmonary oedema. ***Pulmonary oedema*** - The chest X-ray shows classic features of pulmonary oedema, including **bilateral diffuse opacities**, particularly in the perihilar region (a "bat's wing" appearance), and **cephalization** of the pulmonary vessels. - These findings indicate the accumulation of fluid within the lung's interstitial and alveolar spaces, commonly due to increased pulmonary capillary hydrostatic pressure, often from **left-sided heart failure**. *Hydrothorax* - Hydrothorax refers to the accumulation of serous fluid (transudate) specifically within the **pleural space**, not the lung parenchyma itself. - Radiographically, this would present as **blunting of the costophrenic angle** and a **meniscus sign**, which are not the primary features seen in this image. *Pleural effusion* - This is a general term for fluid in the pleural space. The dominant pathology in the provided X-ray is within the **lung parenchyma**, not the pleural cavity. - While a small reactive effusion can accompany pulmonary oedema, the main findings are the diffuse **alveolar infiltrates**, not a large fluid collection obscuring the lung base. *Pulmonary fibrosis* - Pulmonary fibrosis involves chronic **scarring of lung tissue**, which appears as **reticular patterns**, **honeycombing**, or traction bronchiectasis on an X-ray. - The opacities in this image are hazy and "fluffy," which is characteristic of acute fluid accumulation, not the fine, linear patterns of chronic fibrosis.

Q: A patient with a history of breast cancer underwent Cobalt-60 radiotherapy involving the right thorax. She now presents with respiratory distress 1–6 months after completing radiotherapy, and imaging shows haziness in the right lung that is sharply demarcated and conforms to the radiation field. What is the most likely diagnosis?

Radiation Pneumonitis. ***Radiation Pneumonitis*** - This is a non-infectious inflammatory response of the lung parenchyma following radiotherapy, typically occurring **1-6 months** after treatment, which fits the patient's timeline after **Cobalt-60 therapy**. - Imaging findings classically show **diffuse haziness**, consolidation, or ground-glass opacities that are sharply demarcated and conform to the **radiation port**. *Recurrence of Breast Cancer* - **Pulmonary metastases** from breast cancer usually present as discrete **nodules**, masses, or lymphangitic carcinomatosis on imaging, not a diffuse haziness confined to a prior radiation field. - The onset of symptoms in this case is more acute and temporally related to radiation therapy, making an inflammatory process like pneumonitis more likely than metastatic recurrence. *Pulmonary Embolism* - While cancer is a risk factor for **pulmonary embolism (PE)**, a chest X-ray is often normal or shows non-specific findings like atelectasis or a **Hampton's hump**; the diffuse haziness seen here is not a typical feature of PE. - Diagnosis of PE requires a **CT pulmonary angiogram (CTPA)** or V/Q scan, as the clinical signs can overlap but the radiographic evidence points elsewhere. *Infective Pneumonia* - **Infective pneumonia** typically presents with symptoms like **fever**, chills, and a productive cough, which are not described in the clinical vignette. - The radiographic opacities in bacterial pneumonia are usually lobar or segmental and do not have the sharp, straight borders that correspond to a radiation field.

Question 1

Nipple shadows in a chest X-ray characteristically have a sharp:

Accepted Answer

Lateral margin

Answer

Medial margin

Answer

Superior margin

Answer

Inferior margin

Question 2

Minimum fluid collection required for radiological detection of pleural effusion in lateral decubitus view is:

Accepted Answer

25 ml

Answer

15 ml

Answer

35 ml

Answer

45 ml

Question 3

A young man with tuberculosis presents with massive recurrent hemoptysis. What is the most probable cause?

Accepted Answer

Bronchial artery

Answer

Pulmonary artery

Answer

Pulmonary vein

Answer

Superior vena cava

Question 4

What is the most reliable method for diagnosing pulmonary embolism?

Accepted Answer

Pulmonary angiography

Answer

Plain skiagram

Answer

Perfusion scan

Answer

Electrocardiography

Question 5

Which of the following is NOT a radiographic finding of Congestive Heart Failure (CHF)?

Accepted Answer

Oligemia

Answer

Kerley B lines

Answer

Kerley A lines

Answer

Cardiomegaly

Question 6

A patient presents with bilateral hilar lymphadenopathy with eggshell calcification on chest X-ray. What is the most likely diagnosis?

Accepted Answer

Silicosis

Answer

Tuberculosis

Answer

Sarcoidosis

Answer

Pneumoconiosis due to asbestos

Question 7

A patient with a history of occupational asbestos exposure presents with SOB and fatigue. CXR was done. What is the diagnosis? ![img-18.jpeg](img-18.jpeg)

Accepted Answer

Asbestosis

Answer

Silicosis

Answer

TB

Answer

Byssinosis

Question 8

Based on the provided chest X-ray images, what is the most likely diagnosis?

Accepted Answer

Pulmonary Edema

Answer

Hydrothorax

Answer

Pleural Effusion

Answer

Pulmonary Fibrosis

Question 9

A chest X-ray is shown below. What is the most likely diagnosis?

Accepted Answer

Pulmonary oedema

Answer

Hydrothorax

Answer

Pleural effusion

Answer

Pulmonary fibrosis

Question 10

A patient with a history of breast cancer underwent Cobalt-60 radiotherapy involving the right thorax. She now presents with respiratory distress 1–6 months after completing radiotherapy, and imaging shows haziness in the right lung that is sharply demarcated and conforms to the radiation field. What is the most likely diagnosis?

Accepted Answer

Radiation Pneumonitis

Answer

Recurrence of Breast Cancer

Answer

Pulmonary Embolism

Answer

Infective Pneumonia

Chest Radiology — MCQs

Chest Radiology — MCQs

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