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Evolution of radiation-induced brain injury: MR imaging-based study
Yi-Xiang J Wang1, Ann D King, Hua Zhou
1Department of Diagnostic Radiology, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, People's Republic of China.
Radiology
|December 19, 2009
Summary
Radiation-induced temporal lobe injury (TLI) in nasopharyngeal carcinoma patients can resolve. White matter lesions (WMLs) appear first, followed by contrast-enhanced lesions and late-stage cysts, with some lesions showing regression on MR imaging.
Area of Science:
- Neurology
- Radiology
- Oncology
Background:
- Nasopharyngeal carcinoma (NPC) treatment often involves radiation therapy.
- Radiation can cause delayed brain injury, particularly affecting the temporal lobes.
- Understanding the temporal evolution of radiation-induced temporal lobe injury (TLI) is crucial for patient management.
Purpose of the Study:
- To evaluate temporal lobes in patients treated for nasopharyngeal carcinoma.
- To understand delayed radiation-induced brain injury independent of the tumor.
- To characterize the imaging features and temporal changes of TLI.
Main Methods:
- Retrospective analysis of MR imaging in 124 NPC patients with TLI.
- Assessment of white matter lesions (WMLs), contrast-enhanced lesions, and cysts.
- Statistical comparison of lesion detection times and patterns of change.
Main Results:
- 192 injured temporal lobes were analyzed; 103 had follow-up imaging.
- WMLs were present in all cases (100%), contrast-enhanced lesions in 82.5%, and cysts in 12.7%.
- Lesions showed varying degrees of regression or resolution, particularly WMLs and contrast-enhanced lesions.
Conclusions:
- Radiation-induced TLI is not always progressive and can show regression or resolution.
- WMLs are the earliest sign, followed by contrast-enhanced lesions, and then cysts.
- Contrast-enhanced lesions tend to become necrotic with increasing size.
