神经根囊肿和肉芽肿的磁共振成像特征。
The magnetic resonance imaging characteristics of radicular cysts and granulomas.
机构信息
Dental Radiology and Radiation Oncology, Graduate School of Dentistry, Tokyo Medical and Dental University, Yushima 1-5-45, Bunkyo-ku, Tokyo, Japan.
School of Dentistry, Mae Fah Luang University, 333 Moo1, Tshasud, Muang, Chiangrai, Thailand.
出版信息
Dentomaxillofac Radiol. 2023 Feb;52(3):20220336. doi: 10.1259/dmfr.20220336. Epub 2023 Jan 23.
OBJECTIVES
Limited studies have differentiated radicular cysts and granulomas with MRI. Therefore, we investigated the MRI characteristics of the two lesions and clarified features for distinguishing between them.
METHODS
We collected data of 27 radicular cysts and 9 granulomas definitively diagnosed by histopathology and reviewed the fat-saturated weighted, weighted, and contrast-enhanced fat-saturated weighted images. We measured the maximum diameter and apparent diffusion coefficient values of the lesions. We employed Fisher's exact test, the Mann-Whitney test, and independent -tests to compare the two lesions and created a decision tree for discriminating between them.
RESULTS
There were significant differences between radicular cysts and granulomas with respect to five imaging characteristics-signal intensity of the lesion centre on fat-saturated weighted images; signal intensity, texture, and contrast enhancement of the lesion centre on contrast-enhanced fat-saturated weighted images; and maximum diameter of the lesion. The cut-off diameter for radicular cysts was 15.9 mm. The area under the receiver operating characteristic curve, sensitivity, and specificity were 0.971, 85.2%, and 100%, respectively.
CONCLUSIONS
From the decision tree analysis, maximum diameter, lesion centre contrast enhancement on contrast-enhanced fat-saturated weighted images, and lesion centre signal intensity on fat-saturated weighted images were important for discriminating between radicular cysts and granulomas.
目的
有限的研究已经通过 MRI 对根囊肿和肉芽肿进行了区分。因此，我们研究了这两种病变的 MRI 特征，并阐明了区分它们的特征。
方法
我们收集了 27 个根囊肿和 9 个肉芽肿的组织病理学明确诊断的数据，并回顾了脂肪饱和 T2 加权、T1 加权和对比增强脂肪饱和 T1 加权图像。我们测量了病变的最大直径和表观扩散系数值。我们采用 Fisher 精确检验、Mann-Whitney U 检验和独立样本 t 检验来比较两种病变，并创建了一个用于区分它们的决策树。
结果
在病变中心的信号强度、病变中心的信号强度、纹理和对比增强在对比增强脂肪饱和 T1 加权图像上、病变的最大直径等五个影像学特征方面，根囊肿和肉芽肿之间存在显著差异。根囊肿的截断直径为 15.9mm。受试者工作特征曲线下面积、敏感性和特异性分别为 0.971、85.2%和 100%。
结论
从决策树分析来看，最大直径、对比增强脂肪饱和 T1 加权图像上的病变中心对比增强以及脂肪饱和 T2 加权图像上的病变中心信号强度对于区分根囊肿和肉芽肿很重要。
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