Actually, on the CT the resident thought the linear artefact as a retained pacemaker wire.

A metallic density is identified within the inferior aspect of the right atrium, which is favored to represent a small segment of retained pacer lead. Results have been communicated by radiology to the primary team regarding this small fragment of a retained pacer lead.

It is important not forget to review the scout.

CT obtained in a beating heart and see how the computer generates a line on sagittal and coronal images and will fool you.