CT and MRI Surveillance After Open Thoracoabdominal Aortic Aneurysm Repair

Primary Surveillance Recommendation

Obtain a baseline CT or MRI within the first postoperative year after open thoracoabdominal aortic aneurysm repair in patients without residual aortopathy, and repeat imaging every 5 years thereafter if findings remain stable. 1

Perform the first postoperative scan between 1 month and 1 year to establish a baseline and identify early complications such as graft infection or anastomotic pseudo‑aneurysm. 1
The 2024 European Society of Cardiology (ESC) guidelines specifically advise an early CT within 1 month, followed by yearly imaging for the first 2 years after surgery. 4

If the initial imaging study shows no abnormalities and there is no residual aortopathy, continue surveillance at 5‑year intervals. 1
Open surgical repair demonstrates excellent durability, with re‑intervention required in only 1‑7 % of patients over a 10‑year follow‑up period. 5

For patients with residual aortopathy or any abnormal finding on surveillance scans, an annual imaging interval is reasonable. 1
Individuals with genetic connective‑tissue syndromes should undergo more frequent monitoring regardless of initial imaging results. 5

MRI is a suitable alternative to CT for longitudinal surveillance, especially to reduce cumulative radiation exposure and to avoid iodinated contrast in patients with renal impairment. 1
MRI eliminates exposure to nephrotoxic iodinated contrast agents. 5
MRI avoids cumulative radiation dose, which is particularly important for younger patients who will require lifelong surveillance. 5
MRI provides high diagnostic accuracy for detecting post‑operative complications. 5

Higher cost and longer acquisition times compared with CT. 5
Lower spatial resolution than CT. 5
Limited visualization of metallic components and adjacent structures, and increased susceptibility to metallic artifact from surgical clips and grafts. 5

Patients with chronic kidney disease (stage 3 or higher). 5
Middle‑aged or younger patients anticipated to undergo decades of imaging follow‑up. 5
Patients with documented iodinated‑contrast allergy. 2
After the first postoperative year when more frequent controls are needed, MRI may be considered as the primary modality. 4

Open thoracic aortic repair offers superior long‑term durability compared with endovascular approaches. 2
Graft‑related complications (infection, anastomotic pseudo‑aneurysm) are uncommon, occurring in approximately 2 % of patients. 1

Anastomotic pseudo‑aneurysm – may arise at proximal or distal anastomotic sites. 5
Graft infection – rare but potentially catastrophic, requiring urgent intervention. 1
Remote aneurysmal degeneration – progressive dilation of aortic segments adjacent to or distant from the repair. 5

Do not discontinue imaging prematurely; continue 5‑year interval scans indefinitely even when findings are stable. 2
Any abnormal finding on surveillance imaging, however minor, warrants transition to annual follow‑up. 1
Presence of residual aortopathy at any aortic level necessitates more frequent monitoring. 2
Patients with connective‑tissue disorders require annual imaging irrespective of initial results. 5

For patients with baseline renal insufficiency (e.g., serum creatinine > 1.5 mg/dL), MRI should be strongly considered as the primary imaging modality after the first postoperative year. 4
Cumulative exposure to iodinated contrast over decades of surveillance can accelerate chronic kidney disease progression. 5