Schematic anorectal clock - for reporting
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The anus ( normal study ) with annotations to indicate the clock-face for the purposes of reporting.
The 'anal clock system' is used for the reporting of anorectal pathology, such as fistulae or tumours.
For example, ' Thickening of the left lower rectum. with extra-serosal extension between 3 and 6 O'clock'.
Image used for annotation from case http://radiopaedia.org/cases/normal-mri-pelvis-fistula-protocol.