Susceptibility-Weighted Imaging in Preoperative Grading of Cerebral Gliomas
Diagnostic Value of Susceptibility-Weighted Imaging (SWI) in Preoperative Grading of Cerebral Gliomas
Gliomas are the most common primary brain tumors in adults. Determining whether a glioma is low-grade or high-grade before surgery is essential for surgical planning, choosing treatment pathways, and determining prognosis. Currently, definitive grading requires invasive tissue sampling through surgical resection or biopsy. Although conventional magnetic resonance imaging (MRI) is routinely performed, conventional sequences often show overlapping features between low-grade and high-grade tumors, limiting their ability to reliably predict tumor grade.
Susceptibility-weighted imaging (SWI) is an advanced MRI sequence sensitive to microscopic magnetic field distortions caused by blood products, calcification, and abnormal tumor blood vessels. On SWI, these features appear as intratumoral susceptibility signals (ITSS). Because high-grade gliomas typically display greater vascular proliferation and microhemorrhages than low-grade gliomas, quantifying ITSS may provide a non-invasive surrogate for tumor grade.
The primary purpose of this prospective observational study is to assess the diagnostic accuracy of SWI in the preoperative grading of cerebral gliomas, comparing imaging findings directly against histopathological examination according to the 2021 World Health Organization (WHO) Classification of Tumors of the Central Nervous System.
Adult participants with radiologically suspected cerebral gliomas who are scheduled for surgical resection or stereotactic biopsy will undergo a standardized preoperative brain MRI protocol. This protocol incorporates SWI alongside conventional MRI sequences, diffusion-weighted imaging (DWI/ADC), and magnetic resonance spectroscopy (MRS). Two independent radiologists blinded to pathology will assess and grade intratumoral susceptibility signals. Following surgery, imaging-predicted grades will be compared with the final tissue pathology to determine the sensitivity, specificity, and overall diagnostic accuracy of SWI.
調査の概要
状態
研究の種類
入学 (推定)
参加基準
適格基準
就学可能な年齢
- 大人
- 高齢者
健康ボランティアの受け入れ
サンプリング方法
調査対象母集団
説明
Inclusion Criteria:
- Adult patients aged 18 years and older.
- Neuroimaging (CT or MRI) findings suggestive of cerebral glioma.
- Patients scheduled for surgical resection or stereotactic biopsy.
Exclusion Criteria:
- Previous brain surgery for the same lesion.
- Previous cranial radiotherapy or chemotherapy.
- General contraindications to MRI (e.g., cardiac pacemakers, ferromagnetic implants, or severe claustrophobia).
- Poor-quality MRI examinations compromised by significant motion or susceptibility artifacts.
研究計画
研究はどのように設計されていますか？
デザインの詳細
コホートと介入
グループ/コホート |
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Suspected Cerebral Glioma Cohort
Adult patients (≥18 years) presenting with radiologically suspected cerebral gliomas who are scheduled for surgical resection or stereotactic biopsy.
All participants undergo a standardized preoperative brain MRI protocol incorporating conventional sequences (T1, T2, FLAIR, pre- and post-contrast T1), diffusion-weighted imaging (DWI/ADC), magnetic resonance spectroscopy (MRS), and 3D susceptibility-weighted imaging (SWI).
Intratumoral susceptibility signals (ITSS) on SWI are graded semi-quantitatively (grades 0 to 3) to differentiate low-grade (grades 0-1) from high-grade (grades 2-3) tumors.
Final tumor grading is established via histopathological examination of the surgical resection or stereotactic biopsy specimen according to the 2021 WHO Classification of Tumors of the Central Nervous System.
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
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Diagnostic Accuracy of Susceptibility-Weighted Imaging (SWI)
時間枠：Baseline
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Diagnostic accuracy is evaluated as the percentage of participants correctly categorized as having low-grade or high-grade cerebral gliomas using preoperative susceptibility-weighted imaging (SWI) intratumoral susceptibility signal (ITSS) grading, compared against the reference standard of histopathological examination according to the 2021 WHO Classification of Tumors of the Central Nervous System.
ITSS is evaluated on a 4-point scale: Grade 0 (no ITSS), Grade 1 (1-5 dot-like/linear signals), Grade 2 (6-10 signals), and Grade 3 (>10 signals or confluent areas).
Scores are dichotomized into low-grade (Grades 0-1) and high-grade (Grades 2-3) gliomas.
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Baseline
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研究開始 (推定)
一次修了 (推定)
研究の完了 (推定)
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最終確認日
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本研究に関する用語
キーワード
追加の関連 MeSH 用語
その他の研究ID番号
- SWI in Cerebral Glioma Grading
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