This case involves a 38-year-old female patient whose aorta was pierced during a needle-guided CT scan. The patient initially presented to the defendant physician for a PET scan one month prior. After reading the PET scan, the radiologist diagnosed the patient with thymus cancer and ordered a needle-guided CT scan. During the scan, the piercing caused such severe bleeding that the patient untimely died. Following the patient’s death, it was discovered that the PET scan was misread and that the patient was improperly diagnosed with thymus cancer. An expert in diagnostic radiology and a high level of experience with both PET and CT scans was sought to determine whether the defendant physician erred in his evaluation of the PET scan and whether the physician caused undue harm to the patient during the CT scan.