Fig. 3

Pseudoaneurysm appearance across different phases. A large splenic pseudoaneurysm (arrow) is visible in both (a) arterial-phase contrast-enhanced CT and (b) venous-phase CT, characterized by a high-density contrast collection. Only one patient in this cohort had a vascular lesion, a small pseudoaneurysm (0.7 cm) (arrowhead), which was exclusively detected in the arterial phase (c) but not visible in the venous phase (d)