Magnetic Resonance Imaging

Endoanal ultrasonography does have some limitations. Magnetic resonance imaging of the anorectal region was introduced as another imaging modality of this complex region in hopes of improving accuracy in image interpretation. The quality of the image has increased in recent years with the application of the endoanal receiver coil, which has only a 19-mm diameter, and compares favorably with the diameter of the 18-mm endoanal ultrasound probe.

Recent studies have defined MRI appearance of the anal sphincter musculature.26-29 The IAS is seen as a ring of homogenously high-signal density with a low-signal intensity rim that is rich in collagen and contains neurovascu-lar bundles. The EAS muscle can also be demonstrated with high resolution.

deSouza et al.30 reported their experience with endoanal MRI in six women who developed incontinence immediately after childbirth. The MRI revealed the site and extent of the defect in all patients, and the findings were confirmed at the time of surgery. In another group of 16 patients who developed incontinence 15 to 30 years after childbirth, no demonstrable defect was found, but in all cases, atrophy of the external sphincter muscle was revealed. The degree of atrophy did not correlate with the degree of delay in pudendal nerve conduction velocity.

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Pregnancy And Childbirth

Pregnancy And Childbirth

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