M. P. went to the doctor complaining of chronic constipation and pain on the lower left abdomen. The doctor decided to examine the stool for blood and perform a colonoscopy. The stool guaiac test results showed there was no blood in M. P. s stool but the colonoscopy report indicated there were small pouches along the descending colon and rectum. M. P. was sent back to the doctor for a follow-up appointment. What condition or disease do you think M. P. is suffering from?