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These images show the measurements taken on an MRI proctogram study, and are based on this case.
The measurements are taken at maximal straining and are as follows:
Bladder neck: 37 mm below line (mild cystocele)
Uterine cervix: 12 mm below line (mild uterine descent)
Anorectal junction: 63 mm below line (moderate anorectal junction descent)
H line: 75 mm (mild hiatal enlargement)
M line: 60 mm (moderate pelvic floor descent)
Anterior rectocele: 36 mm in depth (moderate sized anterior rectocele)