Conversation: The conversation between human and AI assistant.
[|Human|] After a severe bout of constipation following total knee surgery (14 days) I took several extreme laxatives to relieve this and had a severe blow out. Since then when I lie on my back I feel a golf ball size lump at the end of my spine. It is not painful but troublesome. What could have happened
[|AI|]  I think it would be appropriate to get a MRI of the spine and an USG of the part that you feel has this ball like sensation. There are 2 possibilities for which I have suggested the tests. One is a nerve/spine damage that may be ruled out by testing an MRI of the lumbosacral spine. The more probable possibility is that you may have formed a diverticula like condition which gives you the ball like feeling. Why the tests? You need some extensive examination, like PR examination and a neurological examination. So suggesting a test. Best of luck Chat Doctor.