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Infected aortoiliofemoral grafts: magnetic resonance imaging
Abstract:
Three patients with proved infected aortoiliofemoral grafts were examined by magnetic resonance (MR) imaging using a spin echo technique. MR clearly identified the perigraft abscess, the involvement of adjacent structures, and the longitudinal extent of the process in all patients. The MR findings were: Abscesses create a high signal intensity, somewhat less than fat. The perigraft abscess has a great contrast with the signal void of flowing blood in the graft. Inflammatory changes cause an inhomogeneous intermediate signal, slightly more intense than muscle. Both abscesses and edematous areas increase their signal intensity with long repetition rates and long echo delays. Areas of gas appear black. They cannot be distinguished from calcified plaques. Additional information is gained about the graft patency. Although the specificity has to be proved, MR imaging is sensitive in the detection of infected grafts and for defining the longitudinal extent of the perigraft abscess.
Insights
Magnetic resonance (MR) imaging effectively detects infected aortoiliofemoral grafts by visualizing perigraft abscesses and inflammation. This sensitive technique aids in assessing graft patency and the extent of infection.
Area of Science:
- Radiology
- Medical Imaging
- Vascular Surgery
Background:
- Infected aortoiliofemoral grafts pose significant clinical challenges.
- Accurate diagnosis and delineation of infection extent are crucial for effective management.
Purpose of the Study:
- To evaluate the utility of magnetic resonance (MR) imaging in diagnosing infected aortoiliofemoral grafts.
- To assess MR imaging's ability to identify perigraft abscesses and adjacent structure involvement.
Main Methods:
- Three patients with confirmed infected aortoiliofemoral grafts underwent MR imaging.
- A spin echo technique was employed to acquire detailed images.
Main Results:
- MR imaging clearly identified perigraft abscesses, adjacent tissue involvement, and the longitudinal extent of infection in all cases.
- Abscesses showed high signal intensity, contrasting with the graft's signal void. Inflammatory changes presented as inhomogeneous intermediate signals.
- MR imaging provided additional information regarding graft patency.
Conclusions:
- MR imaging demonstrates high sensitivity in detecting infected aortoiliofemoral grafts.
- The technique is valuable for defining the extent of perigraft abscesses and assessing graft status.