Chest Radiology Practice Questions

Q: Which of the following is NOT a typical differential diagnosis for a solitary pulmonary nodule?

Mycetoma. ***Mycetoma*** - A mycetoma is a **fungal infection** that typically affects subcutaneous tissues, skin, and bone, forming granulomas and sinuses. It is not typically seen as a solitary pulmonary nodule. - While pulmonary fungal infections can occur, a mycetoma in the lung typically presents as a **fungus ball (aspergilloma)** within a pre-existing cavity, rather than a solitary, solid nodule. *Tuberculoma* - A tuberculoma is a **granuloma** caused by Mycobacterium tuberculosis, which can present as a well-defined, solitary pulmonary nodule or mass on imaging. - It represents a contained form of tuberculosis and is a common differential for a solitary pulmonary nodule, especially in endemic areas. *Hamartoma* - A hamartoma is a **benign tumor-like malformation** composed of normal tissues (like cartilage, fat, and muscle) that are disorganized. - It is one of the most common benign causes of a solitary pulmonary nodule. *Bronchogenic carcinoma* - Bronchogenic carcinoma, including adenocarcinoma, squamous cell carcinoma, and large cell carcinoma, is the most significant concern when evaluating a solitary pulmonary nodule. - It is a primary **malignant lung tumor** and represents a crucial differential diagnosis due to its poor prognosis if not detected and treated early.

Q: Which view is best for visualizing the collapse of the middle lobe of the lung?

Lateral. ***Lateral*** - A **lateral chest X-ray** is crucial for localizing abnormalities to specific lung lobes because it allows for a clear visualization of the **fissures** which define the lung lobes. - Collapse of the right middle lobe is particularly well-visualized on a lateral view as a **triangular opacity** that points towards the hilum, often obliterating the right heart border. *Anteroposterior (AP)* - While an AP or PA view can show collapse, it often appears as a **non-specific wedge or triangular opacity** and struggles with precise lobar localization due to superimposed structures. - The **heart shadow and mediastinum** can obscure parts of the middle lobe, making definitive diagnosis challenging from this view alone. *Oblique* - Oblique views are typically used for specific purposes, such as evaluating the **pleura** or **ribs**, and are not a standard view for initial assessment of lobar collapse. - They introduce **distortion and superimposition** that can make the identification and characterization of lobar collapse more difficult than a standard lateral projection. *Lordotic* - A lordotic view is primarily used to visualize the **lung apices** and to differentiate apical lesions from superimposed clavicular shadows. - It is not effective for visualizing the middle lobe, which is located more inferiorly, and would introduce significant distortion, making assessment of its collapse unreliable.

Q: Retrocardiac lucency with air fluid level is seen in

Hiatus hernia. ***Hiatus hernia*** - A **hiatus hernia** occurs when part of the stomach protrudes into the chest through the **esophageal hiatus** of the diaphragm. - This can lead to a **retrocardiac lucency** (gas-filled stomach) with an **air-fluid level** visible on chest X-rays due to gastric contents. - The herniated gastric fundus appears as a characteristic gas bubble behind the heart, particularly well-seen on lateral chest radiographs. *Distal esophageal obstruction* - While distal esophageal obstruction can cause esophageal dilation and sometimes an **air-fluid level** within the esophagus, it generally presents as a tubular structure *behind* the heart rather than a distinct retrocardiac lucency representing a portion of the stomach. - The appearance would be more suggestive of a dilated esophagus filled with contents, not a herniated stomach. *Diaphragmatic eventration* - **Diaphragmatic eventration** is an abnormal elevation of a portion of the diaphragm, often due to congenital weakness or phrenic nerve paralysis. - It does not typically cause a **retrocardiac lucency** with an **air-fluid level**, as it involves the diaphragm itself rather than the herniation of an abdominal organ. - It may show elevation of the hemidiaphragm but without the characteristic gas-filled viscus appearance. *None of the options* - Hiatus hernia is a well-established radiological diagnosis for retrocardiac lucency with an **air-fluid level**, making this option clearly incorrect.

Q: A chest X-ray shows bilateral lung infiltrates. What is the next best investigation?

CT. ***CT*** - A **CT scan (preferably HRCT)** provides a more detailed view of the lung parenchyma, allowing for better characterization of the infiltrates (e.g., location, pattern, presence of nodules, ground-glass opacities, or consolidation). - This detailed imagery is crucial for narrowing down the differential diagnosis and guiding further diagnostic or therapeutic interventions. - **CT is the best next investigation** for characterizing bilateral lung infiltrates seen on chest X-ray. *Sputum examination* - While important for identifying infectious causes, **sputum examination** is often only productive in certain types of pneumonia or infections and might not directly clarify the morphology or distribution of the infiltrates as a CT scan would. - It might be a subsequent step once the nature of the infiltrate is better understood through imaging. *Bronchoscopy* - **Bronchoscopy** is an invasive procedure generally reserved for cases where less invasive methods have failed to yield a diagnosis or when specific findings from imaging (like a CT scan) suggest the need for direct visualization, lavage, or biopsy. - It's not typically the immediate next step after identifying bilateral infiltrates on a chest X-ray. *Echocardiography* - **Echocardiography** is useful for evaluating cardiac causes of bilateral infiltrates (such as pulmonary edema from heart failure). - However, it does not directly visualize or characterize the lung parenchymal infiltrates themselves, making CT more valuable as the next investigation.

Q: Popcorn calcification is seen in:

Pulmonary hamartoma. ***Pulmonary hamartoma*** - **Popcorn calcification** is a pathognomonic radiographic finding highly suggestive of **pulmonary hamartoma**, a **benign tumor** composed of cartilage, fat, and connective tissue - This characteristic calcification pattern is due to the presence of **chondroid (cartilaginous) tissue** within the lesion - Appears as coarse, irregular calcifications resembling popcorn on chest X-ray or CT scan *Bronchogenic carcinoma* - Malignant lung lesions typically show **irregular, spiculated, or ill-defined margins** and tend to grow rapidly - While calcification can occur in some lung malignancies, it usually appears as **eccentric, stippled, or amorphous** rather than the distinctive popcorn pattern - Popcorn calcification is not a feature of primary lung cancers *Tuberculosis* - **Granulomatous infections** such as tuberculosis often lead to calcification, but it usually presents as **laminated, clustered, or target-like patterns** in lymph nodes or within granulomas (Ghon lesion, Ranke complex) - **Popcorn calcification** is not a typical feature of active or healed tuberculous lesions *Pulmonary metastases* - **Metastatic lesions** are generally not calcified, although a few primary tumors (e.g., mucinous adenocarcinoma, osteosarcoma, chondrosarcoma) can metastasize as calcified nodules - When calcification is present in metastases, it is rarely in the specific **popcorn pattern** and is usually diffuse, punctate, or amorphous

Q: Which of the following conditions characteristically causes bilateral hypertranslucency of lung fields on chest X-ray?

Emphysema. ***Correct: Emphysema*** - **Emphysema** causes destruction of alveolar walls, leading to enlarged air spaces and **air trapping**, making both lungs appear hypertranslucent on X-ray - This **bilateral hypertranslucency** is due to reduced lung tissue density, decreased vascular markings, and increased air volume - Classic radiographic features include flattened diaphragms, increased retrosternal space, and hyperlucent lung fields *Incorrect: Mcleod syndrome* - Also known as **Swyer–James–MacLeod syndrome**, this condition causes **unilateral** lung or lobe hyperlucency due to post-infectious obliterative bronchiolitis - The key differentiating feature is that it's **unilateral**, whereas the question asks for bilateral hypertranslucency - Affected lung shows air trapping on expiratory films *Incorrect: Pneumothorax* - A **pneumothorax** presents as a **unilateral** or focal hypertranslucent area due to air in the pleural space - Characterized by **absence of lung markings** beyond the visceral pleural line and associated lung collapse - This is a pleural space abnormality, not a bilateral parenchymal lung disease *Incorrect: Poland syndrome* - **Poland syndrome** is a congenital condition with absence or underdevelopment of the pectoralis major muscle - Can lead to **unilateral** apparent hyperlucency on the affected side due to missing chest wall muscle - This is a **chest wall anomaly**, not a parenchymal lung disease causing bilateral hypertranslucency

Q: Which of the following is not typically seen on a chest X-ray in pulmonary artery hypertension?

Narrowing of central arteries. ***Narrowing of central arteries*** - **Pulmonary artery hypertension** is characterized by the **enlargement of the central pulmonary arteries** due to increased pressure. - **Narrowing of central arteries** would contradict the hemodynamic changes seen in pulmonary hypertension. - This is the finding that is **NOT typically seen**, making this the correct answer. *Enlargement of central arteries* - This is a **hallmark radiographic finding** in pulmonary hypertension, reflecting the **dilatation of the main and proximal pulmonary arteries** due to increased pressure. - The **pulmonary artery segment becomes prominent**, often appearing convex on the left heart border. *Peripheral pruning* - This refers to the **abrupt tapering and loss of peripheral pulmonary vascular markings**, indicating reduced blood flow to the distal lung parenchyma. - It is a **common finding in advanced pulmonary hypertension**, as the distal vessels constrict and become obliterated. *None of the options* - This is incorrect since **narrowing of central arteries** is clearly not a typical finding in pulmonary hypertension.

Q: Inhalational anthrax is characterized by:

Mediastinal widening and pleural effusion. ***Mediastinal widening and pleural effusion*** - The spores of *Bacillus anthracis* are taken up by macrophages, transported to mediastinal lymph nodes, causing lymphadenitis and edema that appears as **mediastinal widening** on chest X-ray. - Hemorrhagic mediastinitis and subsequent vascular compromise lead to the development of hemorrhagic **pleural effusions**, which are characteristic of inhalational anthrax. *Consolidation and pleural effusion* - While pleural effusions are seen, lobar consolidation is more typical of bacterial pneumonias caused by common bacteria, not primarily inhalational anthrax initially. - The primary lung manifestation in anthrax is not parenchymal consolidation but rather hemorrhagic mediastinitis extending to the pleura. *Bilateral patchy opacities with pleural effusion* - Bilateral patchy opacities are more indicative of conditions like atypical pneumonia, viral pneumonia, or acute respiratory distress syndrome (ARDS), which are not the presenting radiographic signs of early inhalational anthrax. - Although advanced cases might show some parenchymal involvement, the hallmark features remain mediastinal and pleural. *None of the options* - This option is incorrect because mediastinal widening and pleural effusion are classic and well-documented radiological findings in inhalational anthrax.

Q: To visualize vascular sling causing tracheal or external airway compression, which of the following would you best prefer?

CT. ***Correct: CT (CT Angiography)*** - **CT angiography is the gold standard** for diagnosing vascular rings and slings causing airway compression - Provides **excellent spatial resolution** with multiplanar and 3D reconstruction capabilities to clearly demonstrate the anatomical relationship between anomalous vessels and the trachea/bronchi - **Fast acquisition time** minimizes motion artifacts, particularly important in pediatric patients who are the typical population affected by vascular slings - Superior for **surgical planning** due to detailed visualization of vascular anatomy and the exact site and degree of airway compression - More readily available and cost-effective compared to MRI for this specific indication *Incorrect: MRI* - While MRI provides excellent soft tissue contrast and avoids ionizing radiation, it has **longer acquisition times** leading to increased risk of motion artifacts, especially in children - Lower spatial resolution compared to CT for vascular structures - May be used as a **complementary modality** when radiation avoidance is critical or for follow-up imaging, but not the first-line preferred modality *Incorrect: Catheter angiography of aorta and pulmonary artery* - **Invasive procedure** with associated risks including vascular injury, bleeding, and contrast reactions - Provides excellent vascular detail but **no information about airway compression** or surrounding soft tissue structures - Reserved for cases requiring **intervention** (embolization, stent placement) or when non-invasive imaging is inconclusive - Has been largely replaced by non-invasive CTA for diagnostic purposes *Incorrect: PET-CT* - Primarily assesses **metabolic activity**, used for oncology staging, infection, and inflammatory conditions - **Not indicated** for structural vascular anomalies or their anatomical relationships to airways - Does not provide the necessary vascular or airway detail for evaluating vascular slings

Question 1

Inferior rib notching is seen in

Accepted Answer

Coarctation of the aorta

Answer

Rickets (Vitamin D deficiency)

Answer

Atrial Septal Defect (ASD)

Answer

Multiple Myeloma

Question 2

Which of the following is NOT a typical differential diagnosis for a solitary pulmonary nodule?

Accepted Answer

Mycetoma

Answer

Tuberculoma

Answer

Hamartoma

Answer

Bronchogenic carcinoma

Question 3

Which view is best for visualizing the collapse of the middle lobe of the lung?

Accepted Answer

Lateral

Answer

Anteroposterior (AP)

Answer

Oblique

Answer

Lordotic

Question 4

Retrocardiac lucency with air fluid level is seen in

Accepted Answer

Hiatus hernia

Answer

Distal esophageal obstruction

Answer

Diaphragmatic eventration

Answer

None of the options

Question 5

A chest X-ray shows bilateral lung infiltrates. What is the next best investigation?

Accepted Answer

CT

Answer

Sputum examination

Answer

Bronchoscopy

Answer

Echocardiography

Question 6

Popcorn calcification is seen in:

Accepted Answer

Pulmonary hamartoma

Answer

Bronchogenic carcinoma

Answer

Tuberculosis

Answer

Pulmonary metastases

Question 7

Which of the following conditions characteristically causes bilateral hypertranslucency of lung fields on chest X-ray?

Accepted Answer

Emphysema

Answer

Mcleod syndrome

Answer

Poland syndrome

Answer

Pneumothorax

Question 8

Which of the following is not typically seen on a chest X-ray in pulmonary artery hypertension?

Accepted Answer

Narrowing of central arteries

Answer

Enlargement of central arteries

Answer

Peripheral pruning

Answer

None of the options

Question 9

Inhalational anthrax is characterized by:

Accepted Answer

Mediastinal widening and pleural effusion

Answer

Consolidation and pleural effusion

Answer

Bilateral patchy opacities with pleural effusion

Answer

None of the options

Question 10

To visualize vascular sling causing tracheal or external airway compression, which of the following would you best prefer?

Accepted Answer

CT

Answer

MRI

Answer

Catheter angiography of aorta and pulmonary artery

Answer

PET-CT

Chest Radiology — MCQs

Chest Radiology — MCQs

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