Abdominal aortic aneurysm MRI
Abdominal Aortic Aneurysm Microchapters
Abdominal aortic aneurysm MRI On the Web
MRI might be a better soft tissue visualizer than ultrasonography and CT, but its limitations limit its usage as a screening tool and as a diagnostic tool during emergencies like ruptured AAA. However its advantages makes it a good alternative in AAA patients with poor renal function and in elective preoperative evaluation of unruptured AAA.
- MRI may be helpful in stable patients with a severe dye allergy, where CT scanning is contraindicated.
- MRI provides imaging of the aorta comparable to that with CT scanning and ultrasonogram without subjecting the patient to dye load or ionizing radiation.
- MRI also provides superior imaging of branch vessels compared with CT scan or ultrasonogram.
- MRI is a more precise preoperative evaluator and affords immediate post operative evaluation of surgical repair of AAA.
- Lack of widespread availability
- Need for a stable patient
- More sensitive to motion than CT, thus requiring the patient to remain motionless for a longer period of time
- Incompatible with monitoring equipment
- High cost
- Less valuable in assessing suprarenal extension of aneurysm
- Less accurate than thin-slice CT
- Thurnher, SA.; Dorffner, R.; Thurnher, MM.; Winkelbauer, FW.; Kretschmer, G.; Polterauer, P.; Lammer, J. (1997). "Evaluation of abdominal aortic aneurysm for stent-graft placement: comparison of gadolinium-enhanced MR angiography versus helical CT angiography and digital subtraction angiography.". Radiology. 205 (2): 341–52. PMID 9356613.
- Litmanovich, D.; Bankier, AA.; Cantin, L.; Raptopoulos, V.; Boiselle, PM. (2009). "CT and MRI in diseases of the aorta.". AJR Am J Roentgenol. 193 (4): 928–40. PMID 19770313. doi:10.2214/AJR.08.2166.
- Cejna, M.; Loewe, C.; Schoder, M.; Dirisamer, A.; Hölzenbein, T.; Kretschmer, G.; Lammer, J.; Thurnher, S. (2002). "MR angiography vs CT angiography in the follow-up of nitinol stent grafts in endoluminally treated aortic aneurysms.". Eur Radiol. 12 (10): 2443–50. PMID 12271383. doi:10.1007/s00330-002-1429-8.