{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,16]],"date-time":"2026-01-16T12:20:12Z","timestamp":1768566012970,"version":"3.49.0"},"reference-count":19,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2011,3,29]],"date-time":"2011-03-29T00:00:00Z","timestamp":1301356800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Clinical Ultrasound"],"published-print":{"date-parts":[[2011,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose.<\/jats:title><jats:p>To describe the sonographic (US) appearance of fetal anal canal and rectum and establish nomograms of their normal measurements.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods.<\/jats:title><jats:p>This was a prospective, cross\u2010sectional study of 524 healthy women (mean age, 27 years; range, 21\u201337 years) with normal singleton pregnancy between 18 and 40 weeks of gestational age (GA). High\u2010resolution transabdominal US was used to visualize and measure the normal fetal anal canal and rectum.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results.<\/jats:title><jats:p>Satisfactory images and measurements of the fetal anal canal and rectum were obtained in 496 normal fetuses. The diameters of the normal anal canal and rectum were plotted as a function of GA in a sigmoid curve. The curve estimations were expressed by the following cubic regression equations with <jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> of 0.87 and 0.88, respectively (<jats:italic>p<\/jats:italic> &lt; 0.001): anal canal diameter (mm) = 18.272 \u2212 2.151 \u00d7 GA + 0.0095 \u00d7 GA<jats:sup>2<\/jats:sup> \u2212 0.0011 \u00d7 GA<jats:sup>3<\/jats:sup>, and rectal diameter (mm) = 18.545 \u2212 2.543 \u00d7 GA + 0.1237 \u00d7 GA<jats:sup>2<\/jats:sup> \u2212 0.0016 \u00d7 GA<jats:sup>3<\/jats:sup>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions.<\/jats:title><jats:p>The fetal anal canal and rectum are visible sonographically between 18 and 40 weeks of GA. The knowledge of their normal US appearance and size from the second trimester of pregnancy onwards may help identify developmental anomalies. \u00a9 2011 Wiley Periodicals, Inc. 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