The height of intussusception from the anal canal is usually estimated by defecography.

Defecography may be indicated for the following reasons:

Specifically, defecography can differentiate between anterior and posterior rectocele.

Defecography may also demonstrate abnormal perineal descent.

Each patient had a proctometrogram to exclude Hirshsprung's disease and an integrated dynamic defecography to identify anismus or other relevant anorectal abnormalities.

Imaging such as a defecating proctogram or dynamic MRI defecography can demonstrate the abnormal folding of the rectal wall.

Other techniques include manometry, balloon expulsion test, evacuation proctography (see defecating proctogram), and MRI defecography.

Some recommend biopsy as essential for diagnosis since ulcerations may not always be present, and others state defecography as the investigation of choice to diagnose SRUS.

Defecography, sigmoidoscopy, transrectal ultrasound, mucosal biopsy, anorectal manometry and electromyography have all been used to diagnose and study SRUS.

Defecography studies demonstrated that degrees of internal intussusception are present in 40% of asymptomatic subjects, raising the possibility that it represents a normal variant in some, and may predispose patients to develop symptoms, or exacerbate other problems.

Dynamic rectal examination on "the Radiology Assistant", many example defecating proctograms with interpretation.

Defecography (also known as proctography, defecating/defecation proctography, evacuating/evacuation proctography or dynamic rectal examination) is a type of medical radiological imaging in which the mechanics of a patient's defecation are visualized in real time using a fluoroscope.