Siegel C L, Middleton W D, Teefey S A, McClennan B L
Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, Missouri 63110, USA.
Radiology. 1996 Mar;198(3):789-93. doi: 10.1148/radiology.198.3.8628873.
To analyze whether shadowing and other ultrasound (US) features were helpful for distinguishing angiomyolipoma (AML) from renal cell carcinoma (RCC).
US images were reviewed of 49 patients with RCC and 35 patients with AML. Each tumor was evaluated for size, location, echogenicity, homogeneity, shadowing, hypoechoic rim, and intratumoral cysts. When available, computed tomographic (CT) scans of AMLs were analyzed for the amount of fat and soft tissue in each lesion.
AMLs tended to be smaller and more frequently echogenic than RCCs, but statistically significant overlap occurred. Shadowing was seen in 12 (33%) AMLs but was not seen in RCCs. Hypoechoic rims and intratumoral cysts were seen only in RCCs (numbers were too small to perform further statistical analysis).
In hyperechoic renal masses, the presence of shadowing, a hypoechoic rim, and intratumoral cysts are important findings that may help distinguish AML from RCC.
分析声影及其他超声（US）特征是否有助于区分肾血管平滑肌脂肪瘤（AML）与肾细胞癌（RCC）。
回顾了49例RCC患者和35例AML患者的US图像。对每个肿瘤的大小、位置、回声性、均匀性、声影、低回声边缘及瘤内囊肿进行评估。如有AML的计算机断层扫描（CT）图像，分析每个病灶内脂肪和软组织的含量。
AML往往比RCC小且回声更常见，但存在统计学上的显著重叠。12例（33%）AML可见声影，而RCC未见声影。仅在RCC中见到低回声边缘和瘤内囊肿（数量过少无法进行进一步统计分析）。
在高回声肾肿块中，声影、低回声边缘和瘤内囊肿的存在是重要发现，可能有助于区分AML与RCC。
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