enhancing lesion
A brain abnormality that shows increased signal intensity after gadolinium contrast administration, indicating blood-brain barrier disruption.
Full Definition
An enhancing lesion is a brain abnormality that demonstrates increased signal intensity on T1-weighted MRI sequences following intravenous administration of gadolinium-based contrast agents. Enhancement occurs when contrast material extravasates through a disrupted blood-brain barrier, which is characteristic of many pathological processes including high-grade tumors, metastases, infections, and inflammatory conditions. In neuro-oncology, the pattern of enhancement (rim-enhancing, solid, nodular) provides important diagnostic and prognostic information. Serial imaging assessment of enhancement patterns is crucial for monitoring treatment response and detecting tumor recurrence.
Usage
Usage note: Specify enhancement pattern (rim, solid, nodular) when describing; distinguish from artifact or normal vascular enhancement.
In Context
- "Post-contrast images revealed a ring-enhancing lesion in the left temporal lobe." — radiology report
- "The previously enhancing lesion showed complete resolution following treatment." — follow-up imaging report