CT Chest, Abdomen, and Pelvis Without and With IV Contrast There is no relevant literature regarding venous phase CT chest, abdomen, and pelvis for the follow-up of known thoracoabdominal aneurysm or dissection because most follow-up imaging for known dissection or aneurysm uses an arterially timed contrast bolus in the form of a CTA (discussed below). However, contrast-enhanced CT can provide information regarding the size and extent of aortic pathology as well as evaluate for extravascular pathology. Although typically not performed for the purpose of follow-up of thoracoabdominal aortic pathology, multiphase CT performed to evaluate for extravascular pathology can often assess for acute changes in thoracoabdominal Thoracoabdominal Aortic Aneurysm or Dissection dissection or aneurysm, such as intramural hematoma. Unenhanced CT may be able to delineate extravascular complications such as hemorrhage or rupture. If venous phase or unenhanced CT has already been performed, additional imaging with CTA may not be required in some patients. CT Chest, Abdomen, and Pelvis Without IV Contrast There is no relevant literature for CT chest, abdomen, and pelvis without intravenous (IV) contrast for the follow- up of known thoracoabdominal aneurysm or dissection. Although most follow-up of known aortic disease is performed with IV contrast [29-31], select groups of patients may be monitored with unenhanced CT to evaluate measurements of aortic size, which may guide further management [32]. Unenhanced CT may be able to delineate extravascular complications such as hemorrhage or rupture [32]. If venous phase or unenhanced CT has already been performed, additional imaging with CTA may not be required in some patients.
Thoracoabdominal Aneurysm or Dissection Treatment Planning and Follow Up. CT Chest, Abdomen, and Pelvis Without and With IV Contrast There is no relevant literature regarding venous phase CT chest, abdomen, and pelvis for the follow-up of known thoracoabdominal aneurysm or dissection because most follow-up imaging for known dissection or aneurysm uses an arterially timed contrast bolus in the form of a CTA (discussed below). However, contrast-enhanced CT can provide information regarding the size and extent of aortic pathology as well as evaluate for extravascular pathology. Although typically not performed for the purpose of follow-up of thoracoabdominal aortic pathology, multiphase CT performed to evaluate for extravascular pathology can often assess for acute changes in thoracoabdominal Thoracoabdominal Aortic Aneurysm or Dissection dissection or aneurysm, such as intramural hematoma. Unenhanced CT may be able to delineate extravascular complications such as hemorrhage or rupture. If venous phase or unenhanced CT has already been performed, additional imaging with CTA may not be required in some patients. CT Chest, Abdomen, and Pelvis Without IV Contrast There is no relevant literature for CT chest, abdomen, and pelvis without intravenous (IV) contrast for the follow- up of known thoracoabdominal aneurysm or dissection. Although most follow-up of known aortic disease is performed with IV contrast [29-31], select groups of patients may be monitored with unenhanced CT to evaluate measurements of aortic size, which may guide further management [32]. Unenhanced CT may be able to delineate extravascular complications such as hemorrhage or rupture [32]. If venous phase or unenhanced CT has already been performed, additional imaging with CTA may not be required in some patients.