胆总管十二指肠下腔静脉区正常淋巴结的超声表现

Ultrasonographic demonstration of normal choledochocaval lymph node in normal subjects

目的 观察正常人群中胆总管十二指肠下腔静脉区 (CDC)淋巴结的超声表现。方法 随机选择经临床各种方法检查未发现异常的正常人 2 78例 ,超声扫查CDC区淋巴结。结果 2 78人中 2 49人 ( 89.6 % )超声检查可以清楚地显示该区域 ,其中 1 2 0人可以观察到CDC区的淋巴结。 2 0岁以下者 80 .0 %可以看到该区域的淋巴结 ,随年龄增长 ,淋巴结的显示率下降 ( P <0 .0 0 1 )。超声测量CDC淋巴结的最大长径和横径分别为( 1 0 .71± 1 .98)mm和 ( 5 .1 5± 0 .91 )mm ,淋巴结也随年龄增大逐渐减小。CDC淋巴结形态一般呈卵圆形 ,通常为等或略高回声。结论 对于CDC区正常淋巴结的大小、形状及回声的研究将有助于确定该区域病理性淋巴结的标准 ,以此增加超声诊断的特异性和敏感性。

Objective To observe the ultrasound appearances of lymph node in the choledochocaval (CDC) in normal subjects.Methods Ultrasonography was performed in 278 persons who had no abnormal findings by clinical examinations.Results Adequate visualization of the CDC region on sonography was achieved in 249 of 278 cases ( 89.6 %).The node was identified in 120 of 249 cases with adequate CDC visualization of region.The node was seen more frequently under the age of 20 ( 80.0 %). There was a clear reduction in visualization of CDC lymph node with increasing age(P< 0.001 ).The mean maximum diameters of CDC lymph node on ultrasonography in long and short axes were ( 10.71 ± 1.98 )mm and ( 5.15 ± 0.91 ) mm, respectively.The CDC lymph node gradually decreased in size with age.The shape of CDC lymph node was usually oval and its echo was isoechoic or slightly hyperechoic with respect to the liver.Conclusions Study of normal CDC lymph node in size, shape and echogenicity will help to determine the criteria for the appearances of pathological node in the abdomen and thereby increase the specificity and sensitivity of ultrasonography.