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Wall enhancement of leaking polytetrafluoroethylene grafts: a new CT sign
1Department of Radiology, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia.
Insights
A new computed tomography sign, contrast enhancement of the leaking graft wall, may indicate abnormal permeability in pediatric patients with synthetic vascular grafts after modified Blalock-Taussig procedures.
Area of Science:
- Cardiovascular Surgery
- Pediatric Radiology
- Vascular Imaging
Background:
- Perigraft seroma is a rare but significant complication following synthetic vascular graft procedures.
- Modified Blalock-Taussig shunts using polytetrafluoroethylene grafts are employed in pediatric cardiovascular surgery.
- Evaluating graft complications requires accurate diagnostic imaging modalities.
Observation:
- Two pediatric patients with perigraft seromas after modified Blalock-Taussig procedures underwent computed tomography (CT) of the chest.
- A novel finding of contrast enhancement in the wall of the leaking graft was observed on delayed CT imaging.
- This enhancement was localized to the leaking graft, even in the presence of bilateral grafts.
Findings:
- Delayed contrast enhancement of the graft wall in the setting of perigraft seroma is a newly described imaging sign.
- This finding was consistently observed in the leaking graft, suggesting localized graft wall abnormality.
- The observation in a patient with bilateral grafts highlights the specificity of the sign to the compromised graft.
Implications:
- This imaging sign may serve as an indicator of abnormal graft permeability and potential leakage.
- It could aid in the early diagnosis and management of perigraft seromas in pediatric patients.
- Further research is warranted to elucidate the mechanism and clinical significance of this finding in vascular graft complications.
Abstract:
Perigraft seroma is a rare complication of synthetic vascular grafts. We describe a new sign observed in two children who underwent computed tomography of the chest for further evaluation of seromas complicating modified Blalock-Taussig procedures in which a polytetrafluoroethylene graft was used. In both patients contrast enhancement of the wall of the leaking graft was demonstrated on delayed imaging. One patient had bilateral grafts, and the enhancement was only demonstrated in the wall of the leaking graft. We discuss the possible mechanism of this finding and propose that this sign may be further evidence of abnormal graft permeability.