Radiographic Signs in Chest Imaging Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Radiographic Signs in Chest Imaging. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Radiographic Signs in Chest Imaging Indian Medical PG Question 1: Choose the best method of diagnosis for the clinical sign represented in the image.
- A. Serum copper
- B. Serum ceruloplasmin (Correct Answer)
- C. Karyotyping
- D. PCR
Radiographic Signs in Chest Imaging Explanation: ***Serum ceruloplasmin***
- The image shows a **Kayser-Fleischer ring**, a greenish-brown discoloration in the periphery of the cornea, which is pathognomonic for **Wilson's disease**.
- **Wilson's disease** is a genetic disorder of copper metabolism characterized by **low serum ceruloplasmin** levels (the primary copper-carrying protein in the blood) and increased copper deposition in various tissues.
*Serum copper*
- While Wilson's disease involves copper accumulation, **total serum copper** can be normal or even elevated due to widespread tissue damage releasing copper into the circulation, making it an unreliable diagnostic marker on its own.
- A low serum copper level can be seen, but it is not as specific as low ceruloplasmin, as much of the copper in serum is bound to ceruloplasmin.
*Karyotyping*
- **Karyotyping** is used to analyze the number and structure of chromosomes and is primarily indicated for diagnosing chromosomal abnormalities, such as Down syndrome or Turner syndrome.
- It is not relevant for diagnosing metabolic disorders like Wilson's disease, which is caused by a mutation in a single gene (ATP7B), not a chromosomal aberration.
*PCR*
- **PCR (Polymerase Chain Reaction)** is a technique used to amplify DNA sequences and can be used for genetic testing to identify specific mutations.
- While genetic testing for the **ATP7B gene** mutation is a confirmatory test for Wilson's disease, it is not the primary or best method for initial diagnosis, especially when classic clinical signs and biochemical markers (like low ceruloplasmin) are present.
Radiographic Signs in Chest Imaging Indian Medical PG Question 2: Which finding is NOT associated with pulmonary embolism on CT angiography?
- A. Filling defects
- B. Hampton's hump (Correct Answer)
- C. Enlarged pulmonary artery
- D. Oligemia
Radiographic Signs in Chest Imaging Explanation: ***Hampton's hump***
- **Hampton's hump** is a **peripheral wedge-shaped opacity** representing **pulmonary infarction**, classically described as a **chest X-ray finding**, not a primary CT angiography (CTA) finding.
- While the parenchymal opacity from infarction can be visualized on CT, it is **not what CTA is designed to detect**—CTA primarily visualizes the **pulmonary vasculature and intraluminal thrombi**.
- Hampton's hump reflects a **consequence** of PE (tissue infarction) rather than the embolus itself, making it **NOT directly associated with PE on CTA**.
*Filling defects*
- **Filling defects** represent **intraluminal thrombus** within contrast-filled pulmonary arteries.
- This is the **hallmark and primary diagnostic sign** of pulmonary embolism on CT angiography.
- CTA is specifically performed to visualize these vascular abnormalities.
*Enlarged pulmonary artery*
- An **enlarged main pulmonary artery** (>29 mm) is a **secondary finding** on CTA that suggests **pulmonary hypertension**.
- This can result from acute massive PE or chronic thromboembolic disease.
- It is readily visualized and measured on CTA as part of PE assessment.
*Oligemia*
- **Oligemia (Westermark sign)** refers to **regional decreased vascularity** distal to a significant pulmonary artery obstruction.
- While classically a **chest X-ray finding**, decreased vessel caliber and perfusion changes **can be appreciated on CTA**.
- Unlike Hampton's hump (a parenchymal consequence), oligemia reflects the **vascular effect** of the obstruction and is thus more directly related to CTA findings.
Radiographic Signs in Chest Imaging Indian Medical PG Question 3: A chest X-ray (CXR) of a patient is shown. What is the next step in management of this patient?
- A. Ventilation perfusion scan
- B. Bronchoalveolar lavage
- C. High resolution CT scan
- D. Exploratory laparotomy (Correct Answer)
Radiographic Signs in Chest Imaging Explanation: ***Exploratory laparotomy***
- The chest X-ray shows **free air under the diaphragm** on the right side, indicating **pneumoperitoneum**.
- **Pneumoperitoneum** usually signifies a **perforated abdominal viscus**, a surgical emergency requiring immediate exploration to identify and repair the perforation.
*Ventilation perfusion scan*
- This scan is primarily used to diagnose **pulmonary embolism** and is not indicated for the current finding.
- The chest X-ray does not show any signs suggestive of pulmonary embolism, such as a **Westermark sign** or a **Hampton hump**.
*Bronchoalveolar lavage*
- **Bronchoalveolar lavage (BAL)** is a diagnostic procedure used to retrieve fluid from the lower respiratory tract for analysis, typically for infections or inflammatory conditions.
- It would not be helpful in evaluating **subdiaphragmatic free air**, which is an abdominal issue.
*High resolution CT scan*
- While a **CT scan** could further characterize the pneumoperitoneum, the presence of clear free air on a plain film warrants **immediate surgical intervention** rather than further imaging, especially in an acute setting.
- A CT scan might be considered if the diagnosis is equivocal, but in this case, the finding is unequivocal and indicates an emergency.
Radiographic Signs in Chest Imaging Indian Medical PG Question 4: Which sign on chest X-ray indicates tension pneumothorax?
- A. Mediastinal shift (Correct Answer)
- B. Flattened diaphragm
- C. Deep sulcus sign
- D. All of the options
Radiographic Signs in Chest Imaging Explanation: ***Mediastinal shift***
- **Mediastinal shift** away from the affected side is the **most specific and critical radiographic sign** of tension pneumothorax on chest X-ray.
- The progressive air accumulation under positive pressure pushes the **mediastinum** (heart, great vessels, trachea) toward the contralateral side, causing life-threatening **cardiorespiratory compromise** by impeding venous return and cardiac output.
- This finding distinguishes tension pneumothorax from simple pneumothorax and mandates **immediate needle decompression**.
*Flattened diaphragm*
- A **flattened or depressed hemidiaphragm** can occur in tension pneumothorax due to increased intrapleural pressure pushing the diaphragm downward.
- However, this sign is **non-specific** as it also occurs in simple pneumothorax, hyperinflation, COPD, and other conditions.
- While supportive, it does not definitively indicate the high-pressure tension state.
*Deep sulcus sign*
- The **deep sulcus sign** (abnormally deep and lucent costophrenic angle) is seen on **supine chest X-rays** when air accumulates anteriorly and inferiorly in the pleural space.
- This indicates pneumothorax but is **not specific for tension pneumothorax** and can be seen in simple pneumothorax.
- It is position-dependent and does not indicate mediastinal compression.
*All of the options*
- While flattened diaphragm and deep sulcus sign **may be present** in tension pneumothorax, only **mediastinal shift** is the **definitive radiographic indicator** that distinguishes tension from simple pneumothorax.
- Mediastinal shift is the key finding that reflects the pathophysiological pressure differential causing cardiovascular compromise.
Radiographic Signs in Chest Imaging Indian Medical PG Question 5: Which condition is characterized by a specific appearance on CT scans that resembles small centrilobular nodules with branching linear structures?
- A. Pulmonary tuberculosis (Correct Answer)
- B. Silicosis
- C. Pulmonary hydatid cyst
- D. Small cell carcinoma
Radiographic Signs in Chest Imaging Explanation: ***Pulmonary tuberculosis***
- This description ("small centrilobular nodules with **branching linear structures**") is characteristic of the **tree-in-bud pattern** seen on CT scans, which is a hallmark finding in active **endobronchial spread of tuberculosis**.
- The tree-in-bud pattern results from the impaction of tuberculous **granulomas** and caseous material in the terminal and respiratory bronchioles.
*Silicosis*
- Characterized by multiple small, well-defined **nodules** (often in the upper lobes) that tend to calcify, but typically lacks the fine **branching linear structures**.
- It’s associated with occupational exposure to **silica dust** and may progress to **massive progressive fibrosis**.
*Pulmonary hydatid cyst*
- Presents as a well-defined, usually **single, large cystic lesion** on CT, often with internal membranes if ruptured (water lily sign or crumpled membrane sign).
- It does not typically manifest with small centrilobular nodules or branching linear structures.
*Small cell carcinoma*
- Usually appears as a **large central mass**, often with mediastinal lymphadenopathy, and sometimes associated with obstructive pneumonitis.
- It does not typically present as diffuse small centrilobular nodules with branching patterns.
Radiographic Signs in Chest Imaging Indian Medical PG Question 6: A chest X-ray shows a 'silhouette sign' with opacity obscuring the right heart border. Which lobe of the lung is most likely affected?
- A. Right upper lobe
- B. Right middle lobe (Correct Answer)
- C. Right lower lobe
- D. Left lower lobe
Radiographic Signs in Chest Imaging Explanation: ***Right middle lobe***
- The **silhouette sign** occurs when two objects of similar radiographic density are in direct contact, obscuring their common border.
- The **right middle lobe** is adjacent to the right heart border, so an opacity in this lobe will typically obscure the border.
*Right upper lobe*
- The right upper lobe is positioned superiorly and medially, meaning opacification would more likely obscure the **right paratracheal stripe** or the superior mediastinal borders.
- It does not directly border the right heart, thus it would not produce a silhouette sign with the cardiac outline.
*Right lower lobe*
- The right lower lobe is primarily associated with obscuring the **right hemidiaphragm** when it collapses or becomes consolidated.
- Although it is somewhat posterior to the heart, it usually does not directly obscure the anterior right heart border.
*Left lower lobe*
- The left lower lobe is on the opposite side of the chest and opacification would not affect the **right heart border**.
- Consolidation here would more likely obscure the **left hemidiaphragm** or the medial part of the left cardiac silhouette in certain views.
Radiographic Signs in Chest Imaging Indian Medical PG Question 7: Pulmonary embolism is most commonly caused by:
- A. Deep vein thrombosis (DVT) of the leg (Correct Answer)
- B. Fat embolism from pelvic fracture
- C. Cardiac emboli from heart disease
- D. Increased pulmonary pressure (a consequence of PE)
Radiographic Signs in Chest Imaging Explanation: ***Deep vein thrombosis (DVT) of the leg***
- **Deep vein thrombosis (DVT)** in the leg is the most common source of emboli that travel to the lungs, leading to pulmonary embolism [1].
- The thrombus breaks off from the deep veins, typically in the **lower extremities**, and propagates through the venous system to the pulmonary arteries [1].
*Increased pulmonary pressure (a consequence of PE)*
- **Increased pulmonary pressure** is a physiological consequence of a significant pulmonary embolism, as blood flow is obstructed, but it is not the cause of the embolism itself.
- This option describes a **downstream effect**, rather than the origin of the embolus.
*Fat embolism from pelvic fracture*
- **Fat embolisms** can occur after long bone fractures (especially pelvic or femur fractures) and surgeries, but they are a less common cause of PE compared to DVT.
- While they can lead to pulmonary symptoms, the mechanism involves **fat globules** entering the circulation, distinct from a thrombus.
*Cardiac emboli from heart disease*
- **Cardiac emboli** typically originate from the heart (e.g., from atrial fibrillation, mural thrombi after myocardial infarction, or valvular disease) and usually cause **systemic emboli** leading to strokes or limb ischemia.
- While rare, paradoxal emboli can occur via a patent foramen ovale but are not the leading cause of "pulmonary" embolism.
Radiographic Signs in Chest Imaging Indian Medical PG Question 8: A chest CT shows 'comet tail' sign in lung bases. Which additional finding would best support rounded atelectasis?
- A. Pleural thickening (Correct Answer)
- B. Ground glass opacities
- C. Tree-in-bud pattern
- D. Honeycomb changes
Radiographic Signs in Chest Imaging Explanation: ***Pleural thickening***
- The 'comet tail' sign refers to **curved bronchi and vessels** leading into a rounded opaque lesion, which is highly characteristic of **rounded atelectasis**.
- **Pleural thickening** is an almost universal finding in rounded atelectasis, as it commonly develops in areas of localized pleural inflammation and fibrosis.
*Ground glass opacities*
- **Ground glass opacities** indicate partial filling of airspaces or thickening of interstitial structures, but they do not specifically point to rounded atelectasis.
- This finding is nonspecific and can be seen in various lung conditions, including infection, inflammation, or early fibrosis.
*Tree-in-bud pattern*
- A **tree-in-bud pattern** on CT suggests infection or inflammation of the small airways (**bronchioles**), commonly seen in conditions like **bronchiolitis**, tuberculosis, or aspiration.
- It does not directly correlate with the development or features of rounded atelectasis.
*Honeycomb changes*
- **Honeycomb changes** are a hallmark of **end-stage pulmonary fibrosis**, representing clustered cystic airspaces with thickened walls.
- While rounded atelectasis involves fibrosis, honeycomb changes represent a distinct and more severe pattern of lung damage.
Radiographic Signs in Chest Imaging Indian Medical PG Question 9: The following are direct signs of lung collapse seen on a chest X-ray, which one of the following is NOT a direct sign?
- A. Crowding of the vessels
- B. Loss of aeration
- C. Mediastinal shift (Correct Answer)
- D. Displacement of the fissure
Radiographic Signs in Chest Imaging Explanation: ***Mediastinal shift***
- While mediastinal shift can occur with lung collapse, it is an **indirect sign** caused by the volume loss in the affected hemithorax, pulling the mediastinum towards the collapsed lung.
- Direct signs refer to changes observed *within* the collapsed lung tissue itself, such as increased density or displaced structures, whereas mediastinal shift is a secondary effect.
*Crowding of the vessels*
- This is a **direct sign** of lung collapse, as the pulmonary vessels become compacted due to the loss of lung volume.
- The vessels appear closer together and more prominent in the area of collapse.
*Loss of aeration*
- This is a **direct sign** of lung collapse, as air is expelled or resorbed from the affected lung tissue, leading to increased opacity.
- The collapsed lung appears denser and whiter on the X-ray compared to normally aerated lung.
*Displacement of the fissure*
- This is a **direct sign** of lung collapse, as the interlobar fissures are pulled towards the collapsed lobe due to volume loss.
- The displacement of the fissure indicates the location and extent of the collapse.
Radiographic Signs in Chest Imaging Indian Medical PG Question 10: A 60-year-old woman presents with a history of smoking and cough. Chest X-ray shows a solitary pulmonary nodule. Which of the following is the most appropriate next step in management?
- A. Sputum cytology
- B. Bronchoscopy
- C. CT scan of the chest (Correct Answer)
- D. PET scan
Radiographic Signs in Chest Imaging Explanation: ***CT scan of the chest***
- A **CT scan** provides a more detailed imaging of the nodule, allowing for better characterization of its size, shape, margins, and density (e.g., calcifications).
- This information helps in determining the likelihood of **malignancy** and guiding further management decisions, such as surveillance or biopsy.
*Sputum cytology*
- **Sputum cytology** has a low diagnostic yield for solitary pulmonary nodules, especially if the nodule is not centrally located or cavitating.
- It is more useful for diagnosing **central airway lesions** or widespread pulmonary infiltrates rather than discrete nodules.
*Bronchoscopy*
- **Bronchoscopy** is generally considered after a CT scan has provided more detailed information about the nodule's location and characteristics.
- Its utility in diagnosing a **solitary pulmonary nodule** depends on the nodule's size and proximity to the bronchial tree; peripheral nodules may be difficult to reach.
*PET scan*
- A **PET scan** is typically used to assess the metabolic activity of a nodule and for staging once malignancy is suspected or confirmed.
- It is usually performed **after a CT scan** to characterize the nodule's features, especially if the nodule is indeterminate after initial imaging.
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