Question 1
What is the radiologic definition of multifocal lung findings?
A. A single opacity in the lung parenchyma
B. Abnormalities involving multiple discrete locations in the lung
C. Bilateral pleural effusions
D. Uniform interstitial thickening across both lungs
Correct Answer: B. Abnormalities involving multiple discrete locations in the lung
Explanation: “Multifocal lung findings describe radiologic or pathologic abnormalities occurring in multiple discrete locations within the lung parenchyma.”
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Question 2
Which of the following is a common cause of multifocal lung findings?
A. Emphysema
B. Bronchiolitis obliterans
C. Metastatic disease
D. Pulmonary fibrosis
Correct Answer: C. Metastatic disease
Explanation: “Multifocal lung findings are commonly caused by metastatic disease, with lesions distributed in multiple regions of the lung.”
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Question 3
Which infectious process is most likely to present as multifocal lung findings?
A. Pulmonary edema
B. Fungal infections (e.g., Aspergillosis)
C. Pneumothorax
D. COPD exacerbation
Correct Answer: B. Fungal infections (e.g., Aspergillosis)
Explanation: “Fungal infections such as Aspergillosis can cause multiple lesions in the lung, often appearing as nodules or cavitations.”
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Question 4
What is the utility of PET-CT in evaluating multifocal lung findings?
A. To detect pleural effusion
B. To evaluate metabolic activity and differentiate benign from malignant lesions
C. To visualize air trapping in small airways
D. To assess lung function and capacity
Correct Answer: B. To evaluate metabolic activity and differentiate benign from malignant lesions
Explanation: “PET-CT is useful in distinguishing benign from malignant lesions by assessing metabolic activity in multifocal lung findings.”
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Question 5
Which pattern of distribution in multifocal lung findings is suggestive of sarcoidosis?
A. Centrilobular
B. Perilymphatic
C. Random
D. Peripheral
Correct Answer: B. Perilymphatic
Explanation: “Perilymphatic distribution of nodules is characteristic of sarcoidosis, reflecting involvement of the lymphatic vessels and interlobular septa.”
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Question 6
Which imaging finding is most consistent with bacterial pneumonia presenting as multifocal lung findings?
A. Cavitating nodules
B. Tree-in-bud pattern
C. Pleural plaques
D. Ground-glass opacities
Correct Answer: A. Cavitating nodules
Explanation: “Cavitating nodules may be seen in multifocal bacterial pneumonias, particularly with organisms like Staphylococcus aureus.”
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Question 7
What distinguishes hypersensitivity pneumonitis as a cause of multifocal lung findings?
A. Presence of pulmonary emboli
B. Randomly distributed pulmonary nodules
C. Ground-glass opacities and centril