Magnetic Resonance Proctography

Magnetic resonance imaging (MRI) is a relatively new modality for imaging anal sphincter anatomy and pelvic floor motion during defecation and squeeze without radiation exposure.9 The anal sphincters can also be visualized, preferably using an endoanal MRI coil.10

Figure 12.2. Scintigraphic evaluation of anorectal motion during evacuation and squeeze. Observe that the part of the balloon shaded black is outside the anal canal.
Figure 12.3. Scintigraphic evaluation of normal rectal evacuation.

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