Internal intussusception
Encyclopedia
Internal intussusception of the rectum
Rectum
The rectum is the final straight portion of the large intestine in some mammals, and the gut in others, terminating in the anus. The human rectum is about 12 cm long...

 is a medical symptom associated with straining to defecate, usually associated with chronic constipation
Constipation
Constipation refers to bowel movements that are infrequent or hard to pass. Constipation is a common cause of painful defecation...

 and diagnosed by defecography. Surgical interventions to correct the problem have exhibited limited success, usually treating the intussusception
Intussusception (medical disorder)
An intussusception is a medical condition in which a part of the intestine has invaginated into another section of intestine, similar to the way in which the parts of a collapsible telescope slide into one another. This can often result in an obstruction...

but not always relieving the patient's symptoms.
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