CTICasesPulmonary Artery Penetrating Ulcer Evolving into Pseudoaneurysm
Imaging findings
An initial pulmonary artery study showed a lesion resembling a penetrating atherosclerotic ulcer, extending through the intima into the vessel wall, which was managed conservatively. On follow-up imaging several years later, the same area had evolved into a much larger, broad-based pseudoaneurysm/saccular outpouching at the site of the original defect, with surrounding thrombus and dilation.
Key takeaways
A small penetrating-ulcer-type defect in the pulmonary artery can progressively erode and enlarge over years into a large pseudoaneurysm, and without the benefit of the prior baseline study such a lesion could be read very differently by different observers; the case underscores how much interpretation of a single isolated pulmonary artery aneurysm depends on having prior imaging to show its evolution.
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