Correct!
5. The thoracic CT shows variably-sized, circumscribed, non-calcified nodules and cysts bilaterally

The thoracic CT shows multiple, bilateral non-calcified circumscribed pulmonary nodules as well as scattered thin-walled pulmonary cysts, some of which are closely associated with the nodules. The nodules range in size from a few millimeters to nearly 3 cm- this size range is inconsistent with miliary disease, as “miliary” nodules usually measure 1-2 mm in size. None of the nodules exhibit an association with enlarged vessels, and therefore the morphology of these nodules is not suggestive of arteriovenous malformation. The nodules are largely circumscribed and no ground-glass opacity, a finding that often suggests a hemorrhagic lesion, is seen surrounding the nodules (i.e., there is no “ground-glass opacity “halo”). None of the nodules show cavitation, although several cysts are present bilaterally, some closely associated with the nodules.

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

1. The nodules are indeterminate as regards their etiology
2. The nodules are most consistent with a benign, non-infectious inflammatory process
3. The nodules are most consistent with a benign, post-infectious process
4. The nodules are most consistent with a highly aggressive process, such as malignancy
5. The nodules are most consistent with benign pulmonary neoplasia

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