Correct!
1. The nodules are indeterminate as regards their etiology

The nodules are technically indeterminate, and, while the incidental detection of an aggressive process, such as malignancy (choice 4), does occasionally occur, this possibility is less likely given that little change in the size of the nodules has been noted over a 3-year period. The nodules could be the result of a number of indolent processes, including infections (particularly fungal infections), benign neoplasms, or rare proliferative lesions, but there is simply no way to distinguish among these various possibilities at this point.

A thoracic CT scan from 5 years earlier (Figure 4) was located.

Figure 4. Axial enhanced thoracic CT performed 5 years prior to presentation.

Regarding the thoracic CT, which of the following statements is most accurate? (click on the correct answer to be directed to the eighth of 11 pages)

1. The previous thoracic CT (Figure 4) shows no evidence of either the nodules or cysts found on the presentation thoracic CT (Figure 3)
2. The previous thoracic CT (Figure 4) shows that the nodules and cysts seen at the presentation thoracic CT (Figure 3) are present and unchanged from 5 years earlier
3. The previous thoracic CT (Figure 4) shows that the nodules and cysts seen at the presentation thoracic CT (Figure 3) have increased in size and number
4. The previous thoracic CT (Figure 4) shows that the nodules and cysts seen at the presentation thoracic CT (Figure 3) have decreased in size and number
5. The previous thoracic CT (Figure 4) shows that the nodules seen at the presentation thoracic CT (Figure 3) were all previously cavitary

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