Correct!
4. 1 and 3

There are both scattered ground glass opacities and small nodules present on the CT scan (Figure 2).

Figure 2. Thoracic CT in lung windows showing ground glass opacities (white square) and small centrilobular nodules (white circles).

Which of the following is/are true of centrilobular nodules? (Click on the correct answer to proceed to the fourth of fivel pages)

1. Are diagnostic of hypersensitivity pneumonitis
2. Are usually caused by sarcoidosis
3. Can be associated with a variety of pulmonary infections
4. Touch the pleural surface
5. All of the above

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