Correct!
4. The cystic right medial basal lesion is grossly fluid-filled

The cystic medial right basal lesion has neither regressed nor enlarged, but is now grossly fluid-filled, with new nodular opacities and peribronchovascular thickening in the vicinity of the right basal lesion. No pleural effusion is seen on either side and no significant left lung opacity is present.

The CT was subsequently repeated using CT aortography technique (Figure 8) several weeks later, after the patient was successfully treated with antibiotics and discharged from the hospital.

Figure 8. Enhanced axial CT aortography.

Which of the following represents the most accurate assessment of the thoracic CT findings? (Click on the correct answer to be directed to the fifteenth of sixteen pages)

1. CT aortography shows a pulmonary artery pseudoaneurysm
2. CT aortography shows an aberrant vessel supplying the cystic right medial basal lesion
3. CT aortography shows aorto-pulmonary arterial shunting
4. CT aortography shows intercostal artery pseudoaneurysm
5. CT aortography shows no specific findings that add to what is already known

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