Peletti Adriana B, Baldisserotto Matteo
Hospital da Criança Conceição, Ministério da Saúde, Porto Alegre, RS, Brazil.
Pediatr Radiol. 2006 Nov;36(11):1171-6. doi: 10.1007/s00247-006-0305-0. Epub 2006 Sep 27.
US detection of a normal appendix can safely rule out appendicitis. However, there is a wide range of accuracy in detection of a normal appendix.
To optimize US examination to detect the normal and the abnormal appendix according to the potential positions of the appendix.
This prospective study included 107 children who underwent gray-scale US scanning. Noncompressive and compressive graded sonography was performed to detect normal and abnormal appendices according to their potential positions. The maximum transverse diameter of the appendices was measured.
Of the 107 children examined, 56 had a histologic diagnosis of acute appendicitis. Sonography had a sensitivity of 100% and specificity of 98% for the diagnosis of appendicitis. A normal appendix was visualized in 44 (86.2%) of the 51 patients without acute appendicitis, and of these 44, 43 were true-negative and 1 was false-positive. Normal and abnormal appendices, respectively, were positioned as follows: 54.4% and 39.3% were mid-pelvic; 27.2% and 28.6% were retrocecal; 11.4% and 17.8% were deep pelvic; and 6.8% and 14.3% were abdominal.
US scanning according to the potential positions of the appendix was useful in the detection of normal appendices in children suspected of having appendicitis.
超声检查发现正常阑尾可安全排除阑尾炎。然而，正常阑尾的检测准确性差异很大。
根据阑尾的可能位置优化超声检查，以检测正常和异常阑尾。
这项前瞻性研究纳入了107例接受灰阶超声扫描的儿童。根据阑尾的可能位置，进行非压迫性和压迫性分级超声检查以检测正常和异常阑尾。测量阑尾的最大横径。
在接受检查的107例儿童中，56例经组织学诊断为急性阑尾炎。超声诊断阑尾炎的敏感性为100%，特异性为98%。在51例无急性阑尾炎的患者中，44例（86.2%）可见正常阑尾，其中43例为真阴性，1例为假阳性。正常和异常阑尾的位置分别如下：盆腔中部占54.4%和39.3%；盲肠后占27.2%和28.6%；盆腔深部占11.4%和17.8%；腹部占6.8%和14.3%。
根据阑尾的可能位置进行超声扫描，有助于检测疑似阑尾炎儿童的正常阑尾。
