Herek Ozkan, Polat Aziz
Department of Pediatric Surgery, Pamukkale University Faculty of Medicine, Cocuk Cerrahisi Anabilim Dali, 20100 Denizli, Turkey.
Surg Today. 2004;34(2):190-2. doi: 10.1007/s00595-003-2656-6.
Anterior displacement of the anus (ADA), otherwise known as "anterior ectopic anus," is considered to be a common congenital abnormality of anorectal region. However, the true incidence of this condition is not well known. We evaluated the incidence of ADA and its relationship to constipation in 357 children (191 boys and 166 girls) who were admitted to our hospital with unrelated disorders. For this purpose, the anal index was defined as the ratio of the scroto-anal distance to the scroto-coccygeal distance in boys, and as the ratio of the fourchette-anal distance to the fourchette-coccygeal distance in girls. An anal index of less than 0.34 in girls and less than 0.46 in boys was determined to be an ADA. The incidence of ADA was 43.4% in girls and 24.6% in boys (P < 0.01). However, the incidence of constipation in children with a normal anal index and those with a low anal index indicative of an ADA was not significantly different. These findings suggest that ADA is a common variant of the normal anatomical location of the anus, especially in girls.
肛门前移（ADA），又称“前异位肛门”，被认为是肛肠区域常见的先天性异常。然而，这种疾病的真实发病率尚不清楚。我们评估了357名因无关疾病入院的儿童（191名男孩和166名女孩）中ADA的发病率及其与便秘的关系。为此，肛门指数在男孩中定义为阴囊至肛门距离与阴囊至尾骨距离的比值，在女孩中定义为阴唇系带至肛门距离与阴唇系带至尾骨距离的比值。女孩肛门指数小于0.34且男孩肛门指数小于0.46被确定为ADA。ADA的发病率在女孩中为43.4%，在男孩中为24.6%（P<0.01）。然而，肛门指数正常的儿童和肛门指数低提示ADA的儿童中便秘的发病率没有显著差异。这些发现表明，ADA是肛门正常解剖位置的常见变异，尤其是在女孩中。
