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Quantifying Cognitive Decrements Caused by Cranial Radiotherapy
Published on: October 18, 2011
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Radiation-induced cerebral cavernous malformations.
Satoshi Tsutsumi1, Ikuko Ogino2, Natsuki Sugiyama1
1Department of Neurological Surgery, Juntendo University Urayasu Hospital, Japan.
Journal of the Neurological Sciences
|June 14, 2025
Summary
Radiation-induced cerebral cavernous malformations (CCMs) present uniquely, often incidentally discovered with secondary tumors. Genomic analysis suggests exon 5 of chromosome 7 may be particularly sensitive to radiation exposure.
Area of Science:
- Neuroscience
- Genetics
- Vascular Biology
Background:
- Cerebral cavernous malformations (CCMs) are vascular anomalies.
- CCMs may develop following cranial irradiation.
- Clinical presentation of radiation-induced CCMs remains undocumented.
Purpose of the Study:
- To investigate the clinical characteristics of CCMs that arise after radiation exposure.
- To identify potential genetic factors and clinical courses of radiation-induced CCMs.
Main Methods:
- Retrospective analysis of 51 patients with multiple CCMs (2006-2024).
- Identification of five cases with suspected radiation-induced CCMs (4 post-cranial irradiation, 1 post-endovascular therapy).
- Genomic analysis of CCM mutations, focusing on CCM1 and specific exon locations.
Main Results:
- Five patients had radiation-induced CCMs; four developed symptomatic meningioma.
- The mean latency period from radiation to CCM identification was 31.2 years.
- CCM1 mutation in exon 5 was identified in four radiation-induced cases, significantly higher than in non-irradiated controls.
Conclusions:
- Radiation-induced CCMs may have distinct pathogenic mechanisms compared to hereditary forms.
- These CCMs often present with a stable clinical course and are incidentally found alongside secondary tumors.
- Exon 5 of chromosome 7 appears more susceptible to radiation-induced mutations in CCM development.
