Anal Endosonographic Findings of Internal Anal Sphincter in Normal Adult Korean.
- Author:
Kyung Jong KIM
;
Cheong Yong KIM
;
Jeong Hwan JANG
;
Kweon Cheon KIM
;
Young Don MIN
- Publication Type:Original Article
- Keywords:
Internal anal sphincter;
Anal endosonography
- MeSH:
Adult*;
Anal Canal*;
Endosonography;
Female;
Humans
- From:Journal of the Korean Society of Coloproctology
1998;14(2):217-224
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To describe the appearance and average thickness of the internal anal sphincter with anal endosonography in healthy Korean adults. MATERIAL AND METHODS: 184 subjects(male: 96, female: 88) with no history of anorectal disease or surgery were studied with anal endosonography. The average thickness of internal sphincter was meas ured at the mid-anal canal. For the internal sphincter, which is often asymmetric, the thickness of each 4 part(12, 3, 6 and 9 o'clock direction) were measured in left lateral decubitus position. RESULTS: The anal wall was well visualized in 5 layers(mucosa, submucosa, internal anal sphincter, intersphincteric plane, external anal sphincter) with anal endosonography. The anal endosonogram showed the internal anal sphincter as a homogenous, well-defined, hypoechoic, circular band, and slightly asymmetric. The average thickness of the internal anal sphincter in the area of mid-anal portion was 2.0 0.3 mm(range: 1~3 mm). There was no sexual difference; however, a significant positive correlation with age was found in average thickness of the internal anal sphincter. The correlation with lean body mass was not found. CONCLUSION: The internal anal sphincter is well-visualized, best defined structure by anal endosonography. Average thickeness of the sphincter in Korean appeared to be the same as in the Western.
