Anorectal Ultrasound

Juan J. Nogueras

During the past decade, anal imaging studies have become increasingly popular as diagnostic tools in the management of patients with both benign and malignant anorec-tal disorders. As surgeons become more comfortable with the application of these modalities, the indications for their use continue to expand. Anal ultrasonography is an accepted modality for the evaluation of several conditions, including fecal incontinence, anal sepsis, and anal cancer. Other ultrasonographic modalities are also used to image the anal canal, including transvaginal ultrasonography and transperineal ultrasonography. Magnetic resonance imaging (MRI) is yet another modality to image the anal region that seems to be increasing in popularity as its availability widens. Each of these imaging modalities and their indications for use in the anal canal will be discussed.

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