Figure 25b. Posttraumatic pseudoaneurysm. (a) Initial contrast-enhanced CT scan shows a large hematoma in the medial segment of the left hepatic lobe (arrows). (b) Contrast-enhanced CT scan obtained 14 days later shows a newly developed, well-circumscribed pseudoaneurysm within the hepatic hematoma (arrow). (c) On a celiac arteriogram, the pseudoaneurysm (arrow) is seen to arise from the left hepatic artery.