Figure 9a. (a) Axial contrast-enhanced CT scan obtained in an 80-year-old woman with a history of a previously malpositioned Swan-Ganz catheter shows a bulge in the pulmonary artery (arrow), a finding that raised suspicion for a pseudoaneurysm. (b) Coronal oblique reformatted image from CT data again shows the bulge in the proximal pulmonary artery (arrow). (c) One of a series of oblique axial CT scans obtained along the longitudinal axis of the pulmonary artery helps confirm the absence of a pseudoaneurysm (arrow).