Renal oncocytoma: Magnetic resonance imaging characteristics
Renal oncocytoma: Magnetic resonance imaging characteristics
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DOI：
10.1016/s0022-5347(01)66329-8
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发表时间：
1996-03-01
影响因子：
6.6
通讯作者：
Lieber, MM
中科院分区：
文献类型：
--
作者：
Harmon, WJ;King, BF;Lieber, MM
目的：我们调查了磁共振成像（MRI）的外观肾嗜酸细胞瘤。材料和方法：1985年和1993年之间，11例患者在我们的机构进行了MRI的肾脏，随后被诊断为肾嗜酸细胞瘤。结果：11例T1加权像中，8例显示肿块与肾皮质相比信号强度降低，6例T2加权像中3例显示肿块与肾皮质相比信号强度增加。此外，5例肿瘤被边界清楚的包膜包围，3例显示中央星状结构，1例包含中央信号降低区域，所有这些在病理学上都与瘢痕相对应。这些MRI表现与肾细胞癌有所不同，肾细胞癌在T1和T2加权脉冲序列上通常表现为中等至高信号强度，并且通常包含出血或坏死的证据。T1加权图像上的低强度均匀肿块，在T2加权图像上表现为强度增加，存在包膜，中央瘢痕或星状，无出血或坏死提示嗜酸细胞瘤。在评估孤立肾、肾功能差、高龄或肾小肿块时，MRI可能有助于诊断嗜酸细胞瘤，从而允许肾保留手术。评价肾脏肿块的最佳MRI应包括T1加权自旋回波图像（含或不含钆）、T2加权图像和梯度回波图像。
Purpose: We investigated the magnetic resonance imaging (MRI) appearance of renal oncocytomas.Materials and Methods: Between 1985 and 1993, 11 patients at our institution underwent MRI of the kidneys and were subsequently diagnosed with renal oncocytoma. Patient charts and MRI were reviewed.Results: Of 11 T1-weighted images 8 showed a mass with decreased signal intensity compared to renal cortex and 3 of 6 T2-weighted images revealed masses with increased intensity. In addition, 5 tumors were surrounded by a well defined capsule, 3 demonstrated a central stellate architecture and 1 contained an area of central decreased signal, all of which corresponded pathologically to scar. These MRI findings differ somewhat from those of renal cell carcinoma, which typically show intermediate to high signal intensity compared to renal cortex on T1 and T2-weighted pulse sequences and usually contain evidence of either hemorrhage or necrosis.Conclusions: A low intensity homogeneous mass on T1-weighted images, which appears as increased intensity on T2-weighted images, the presence of a capsule, central scar or stellate pattern and the absence of either hemorrhage or necrosis suggest oncocytoma. It is in the evaluation of patients with a solitary kidney, poor renal function, advanced age or a small easily resectable renal mass when MRI may help diagnose an oncocytoma and, thus, allow renal sparing surgery. The optimal MRI to evaluate renal masses should include T1-weighted spin echo images with and without gadolinium, T2-weighted images and gradient recalled echo images.