This Figure Shows a CT Scan Where the Lung on the Left

question 52

Multiple Choice

This figure shows a CT scan where the lung on the left is severely impacted by emphysema.
The region indicated by the arrow is clear because

• A) a tumor has formed in this region.
• B) tar from cigarette smoking is blocking the penetration of X-rays through the lung.
• C) the alveoli in this region have all ruptured as a result of exposure to the irritants from cigarette smoke.
• D) fluid has accumulated in this region of the lung as a result of edema.

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