| Anal Endosonographic Findings of Internal Anal Sphincter in Normal Adult Korean. |
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Kim, Kyung Jong , Kim, Cheong Yong , Jang, Jeong Hwan , Kim, Kweon Cheon , Min, Young Don |
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| 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. |
| Key Words:
Internal anal sphincter; Anal endosonography |
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