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Recurrent medulloblastoma: frequency of tumor enhancement on Gd-DTPA MR imaging
N Rollins1, D Mendelsohn, A Mulne
1Department of Radiology, Children's Medical Center, Dallas, TX 75235.
Abstract:
Thirty-two children with medulloblastoma were evaluated postoperatively with conventional and gadolinium-enhanced MR imaging. Eleven patients had abnormal cranial MR studies; nine of these had recurrent tumor. In six patients recurrent tumor enhanced with Gd, while in the other three patients recurrent tumor did not enhance. The remaining two patients had areas of abnormal Gd enhancement that were caused by radiation-induced breakdown of the blood-brain barrier rather than by recurrent tumor. This study shows that not all recurrent medulloblastoma enhances and that the absence of Gd enhancement does not necessarily indicate the absence of recurrent tumor.
Insights
Not all recurrent medulloblastoma enhances with gadolinium (Gd) contrast. Absence of Gd enhancement on MR imaging does not rule out tumor recurrence in children.
Area of Science:
- Pediatric Oncology
- Neuroradiology
- Neuro-oncology
Background:
- Medulloblastoma is a common pediatric brain tumor.
- Postoperative surveillance for medulloblastoma recurrence is crucial.
- Gadolinium-enhanced Magnetic Resonance Imaging (Gd-MRI) is a standard surveillance tool.
Purpose of the Study:
- To evaluate the utility of Gd-enhanced MRI in detecting medulloblastoma recurrence postoperatively.
- To determine if all recurrent medulloblastoma enhances with gadolinium.
Main Methods:
- Retrospective review of 32 children with medulloblastoma.
- Postoperative evaluation using conventional and Gd-enhanced MRI.
- Correlation of imaging findings with clinical outcomes.
Main Results:
- Eleven patients had abnormal cranial MR studies.
- Nine of these had recurrent medulloblastoma.
- Six recurrent tumors enhanced with Gd, while three did not.
- Two patients showed abnormal Gd enhancement due to radiation effects, not recurrence.
Conclusions:
- Gadolinium enhancement is not consistently present in recurrent medulloblastoma.
- Absence of Gd enhancement on MRI does not exclude medulloblastoma recurrence.
- Findings challenge the reliance on Gd enhancement alone for diagnosing medulloblastoma recurrence.