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Updated: Sep 3, 2026

Noninvasive In Vivo Small Animal MRI and MRS: Basic Experimental Procedures
Published on: October 20, 2009
[Endoanal MR imaging: diagnostic assessment]
A Frudinger1, G Buchanan, S Halligan
1Intestinal Imaging Centre,St.Mark's Hospital,Northwick Park, London,UK.
Abstract:
Endoanal MR imaging is an alternative to anal endosonography for the acquisition of high-resolution images of the external and internal anal sphincter. A dedicated anal receiver coil is placed in the anus so that it spans the sphincter complex. Highly detailed images of the sphincters can be obtained in any plane and the morphological abnormalities found in various types of anal incontinence can be demonstrated. Whilst MR demonstrates external sphincter disruption with an efficacy similar to that of endosonography, it is better able to demonstrate external sphincter atrophy that is presumed secondary to neuropathy. The finding of coexisting muscular atrophy on MR may prejudice the effects of anal sphincter repair for obstetric disruption.
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