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Updated: Aug 20, 2026
PET and MRI Guided Irradiation of a Glioblastoma Rat Model Using a Micro-irradiator
Published on: December 28, 2017
[MRI representations of glioma radioencephalopathy]
Qun Zhong1, Xue-Lin Zhang, Yu-Zhong Zhang
1Medical Diagnostic Imaging Center, Nanfang Hospital, Southern Medical University, Guangzhou,Guangdong, 510515, P.R.China. zhongqun@fimmu.com
Background & Objective:
Correctly distinguishing normal tissue reactive changes, tumor residue or relapse, and radioencephalopathy of glioma after radiotherapy by imaging methods is difficult. This study was to analysis MRI representations of glioma radioencephalopathy.
Methods:
MRI records of 5 patients with golima radioencephalopathy treated in our hospital from Sept. 1998 to May 2004 were collected, 4 cases were confirmed by operation, and 1 was diagnosed by MRI and PET. All these 5 cases were suspected recurrence in MRI scans after 1 or 2 radiotherapy periods, but them were confirmed radioencephalopathy pathologically after excision.
Results:
MRI revealed all patients deteriorated within 40 days to 7 months. The edema aggravated (5/5), and most were moderate or severe (4/5). Space occupying signs aggravated (5/5). Lesions enlarged (5/5) with irregular shapes like coral, map, or ring in enhanced scans.
Conclusions:
Radioencephalopathy of glioma occurs within 2 years after radiotherapy mostly. MRI scans manifest edema and space occupying signs aggravated, meanwhile the lesions enlarged progressively in a rather short time. It is characteristic that enhanced lesions were irregular and radiate.
Insights
Distinguishing glioma radioencephalopathy from tumor recurrence after radiotherapy is challenging. MRI shows aggravated edema, space-occupying signs, and enlarged lesions with characteristic radiating enhancement.
Area of Science:
- Neuro-oncology
- Radiology
- Radiation Oncology
Context:
- Differentiating post-radiation changes from tumor recurrence in glioma patients is a significant clinical challenge.
- Magnetic Resonance Imaging (MRI) is crucial for monitoring treatment response and detecting complications after radiotherapy for gliomas.
Purpose:
- To analyze the characteristic MRI representations of glioma radioencephalopathy.
- To aid in distinguishing radioencephalopathy from tumor residue or relapse using imaging.
Summary:
- This study analyzed MRI findings in 5 patients with confirmed glioma radioencephalopathy.
- MRI revealed progressive edema, space-occupying signs, and lesion enlargement within months of radiotherapy.
- Enhanced MRI scans showed characteristic irregular, radiating lesion shapes.
Impact:
- Provides key imaging features to help clinicians differentiate glioma radioencephalopathy from tumor recurrence.
- Improves diagnostic accuracy in post-radiotherapy glioma management.
- Contributes to better patient outcomes through timely and accurate diagnosis.
