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Surgically induced intracranial contrast enhancement: potential source of diagnostic error in intraoperative MR
Background And Purpose:
Intraoperative MR imaging is being used increasingly during neurosurgical interventions. The aim of this study was to describe and classify different forms of surgically induced intracranial contrast enhancement observed during intraoperative MR examinations.
Methods:
A total of 51 intraoperative MR examinations were performed to assess the extent of brain tumor removal. The intraoperative MR results (T1-weighted images, unenhanced and obtained serially after the IV administration of paramagnetic contrast material) were compared with preoperative and early postoperative MR findings. Animal experiments were conducted to obtain further evidence of the mechanism of surgically induced contrast enhancement.
Results:
Four different types of surgically induced contrast enhancement were found: meningeal enhancement, increased enhancement of the choroid plexus, delayed enhancement at the resection margins, and immediate intraparenchymal contrast enhancement. The types of surgically induced contrast enhancement differ regarding their location, configuration, and time course. Their potential to be confused with contrast-enhancing, residual tumor also varies. Three of the four types of surgically induced contrast enhancement were reproducible in an animal model.
Conclusion:
Surgically induced contrast enhancement is a potential source of error in intraoperative MR imaging. Careful analysis of the location, configuration, and time course of intraoperatively observed intracranial enhancement is critical to avoid confusing surgically induced contrast enhancement with contrast-enhancing, residual tumor.
Insights
Intraoperative MRI can show surgically induced contrast enhancement, mimicking residual tumor. Identifying four distinct types based on location, configuration, and timing is crucial for accurate neurosurgical assessments.
Area of Science:
- Neurosurgery
- Radiology
- Medical Imaging
Background:
- Intraoperative magnetic resonance (MR) imaging is increasingly utilized in neurosurgery.
- Accurate assessment of tumor resection extent is critical.
- Surgically induced contrast enhancement can complicate interpretation.
Purpose of the Study:
- To describe and classify different forms of surgically induced intracranial contrast enhancement.
- To differentiate these enhancements from residual tumor.
- To aid in the interpretation of intraoperative MR imaging.
Main Methods:
- Performed 51 intraoperative MR examinations (T1-weighted, serial post-contrast).
- Compared intraoperative findings with pre- and postoperative MR scans.
- Conducted animal experiments to elucidate enhancement mechanisms.
Main Results:
- Identified four types of surgically induced contrast enhancement: meningeal, choroid plexus, delayed resection margin, and immediate intraparenchymal.
- These types vary in location, configuration, and time course.
- Three types were reproducible in an animal model.
Conclusions:
- Surgically induced contrast enhancement is a potential source of diagnostic error in intraoperative MR imaging.
- Careful analysis of enhancement characteristics is vital.
- Distinguishing these artifacts from residual tumor is critical for successful neurosurgical outcomes.