contrast extravasation
Abnormal leakage of contrast material outside blood vessels during imaging, indicating vessel injury or increased permeability.
Full Definition
Contrast extravasation refers to the abnormal escape of contrast media from the intravascular space into surrounding tissues during contrast-enhanced imaging studies. This finding may indicate active bleeding, vessel rupture, increased vascular permeability, or contrast medium reaction. In trauma imaging, contrast extravasation often signifies active hemorrhage requiring immediate intervention, while in tumor imaging, it may represent abnormal vessel permeability or neovascularization. The appearance varies by imaging modality, appearing as high-density areas on CT or enhancement outside expected vascular structures. Editors must distinguish extravasation from normal contrast enhancement patterns and ensure appropriate urgency is conveyed when describing this finding.
Usage
Usage note: Consider clinical urgency when describing contrast extravasation; use phrases like 'active extravasation' to emphasize ongoing bleeding.
In Context
- "Active contrast extravasation was seen in the retroperitoneum, suggesting ongoing hemorrhage." — Trauma CT report
- "No contrast extravasation was identified following endovascular repair." — Post-procedural imaging