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Intermediate Technical IVT

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

Also known as

contrast-enhancing lesion

Contrasted with

non-enhancing lesion

Don't confuse with

hemorrhage calcification

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