Correct!
2. CT aortography shows an aberrant vessel supplying the cystic right medial basal lesion
CT aortography again demonstrates the cystic medial right basal lesion, now somewhat smaller and again now contains gas in addition to fluid. The CT aortography technique reveals an aberrant artery arising from the distal thoracic aorta supplying the medial right basal lesion. No intercostal artery pseudoaneurysm is evident and no evidence of direct shunting from the aorta or its branches to the pulmonary arterial circulation is seen. No aneurysm of the pulmonary artery is seen.
Based on the CT aortography findings, a specific diagnosis could be offered that lead to cardiovascular surgical consultation. As part of a pre-operative evaluation, catheter aortography (Figure 9) was performed.
Figure 9. Left: Representative image from catheter aortography with selective cannulation of the aberrant artery arising from the distal thoracic aorta shows this artery supplying extensive vascularity to the cystic medial right lower lobe lesion. Right: video of catheter aortography.
Based on the information available from CT and the catheter pulmonary angiogram, what is the most likely diagnosis? (Click on the correct answer to be directed to the sixteenth and final page)