Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content +++ Key Features ++ Usually presents in the newborn period Anal aperture may be very small and filled with a dot of meconium Occurs in about 3 of 10,000 live births, with slightly more males affected +++ Clinical Findings ++ Defecation is difficult Ribbon-like stools Blood and mucus per rectum Fecal impaction Abdominal distention +++ Diagnosis ++ May not be apparent at birth because the anus looks normal Rectal bleeding in a straining infant often leads to a rectal examination, which reveals a tight ring in the anal canal +++ Treatment ++ Dilation of the anal ring is usually curative but may have to be repeated daily for several weeks Your Access profile is currently affiliated with '[InstitutionA]' and is in the process of switching affiliations to '[InstitutionB]'. Please click ‘Continue’ to continue the affiliation switch, otherwise click ‘Cancel’ to cancel signing in. Get Free Access Through Your Institution Learn how to see if your library subscribes to McGraw Hill Medical products. Subscribe: Institutional or Individual Sign In Username Error: Please enter User Name Password Error: Please enter Password Forgot Password? Forgot Username? Sign in via OpenAthens Sign in via Shibboleth