From the case:
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.
Case Discussion
The 'anal clock system' is used for the reporting of anorectal pathology, such as fistulae or tumors.
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.
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