通过超声频率依赖性衰减鉴别肾细胞癌与肾血管平滑肌脂肪瘤。

Differentiation of renal cell carcinomas from angiomyolipomas by ultrasonic frequency dependent attenuation.

作者信息

Taniguchi N, Itoh K, Nakamura S, Obayashi T, Kawai F, Nakamura M

机构信息

Department of Clinical Pathology, Jichi Medical School, Tochigi, Japan.

出版信息

J Urol. 1997 Apr;157(4):1242-5.

PMID:9120911

Abstract

PURPOSE

We determined the usefulness of ultrasonic frequency dependent attenuation in differentiating hyperechoic renal cell carcinoma from angiomyolipoma.

MATERIALS AND METHODS

Frequency dependent attenuation values were determined in 29 renal cell carcinomas and 13 angiomyolipomas.

RESULTS

Frequency dependent attenuation values were significantly lower in renal cell carcinomas than in angiomyolipomas (0.42 versus 0.76 dB./cm./MHz.). Two of the renal cell carcinomas were as hyperechoic as the angiomyolipomas but they were clearly differentiated by the low frequency dependent attenuation. Two other renal cell carcinomas exhibited high values because of the abundance of fibrous tissue. However, they were readily diagnosed by the typical low echoic B-mode images. Frequency dependent attenuation did not differ between histological types of renal cell carcinoma. One angiomyolipoma that was poor in fat and rich in muscle components had an exceptionally low frequency dependent attenuation. Therefore, frequency dependent attenuation values can be regarded as an inversion of computerized tomography numbers.

CONCLUSIONS

Frequency dependent attenuation measurement is a promising diagnostic aid in differentiating hyperechoic renal cell carcinomas from angiomyolipomas.

摘要

目的

我们确定了超声频率依赖性衰减在鉴别高回声肾细胞癌与肾错构瘤中的作用。

材料与方法

测定了29例肾细胞癌和13例肾错构瘤的频率依赖性衰减值。

结果

肾细胞癌的频率依赖性衰减值显著低于肾错构瘤（分别为0.42与0.76dB/cm/MHz）。2例肾细胞癌与肾错构瘤一样呈高回声，但通过低频依赖性衰减可将它们清楚地区分开。另外2例肾细胞癌因纤维组织丰富而表现出高值。然而，通过典型的低回声B超图像可轻易诊断出它们。肾细胞癌的组织学类型之间频率依赖性衰减无差异。1例脂肪少而肌肉成分丰富的肾错构瘤其频率依赖性衰减异常低。因此，频率依赖性衰减值可被视为计算机断层扫描数值的倒置。