Anne,
The research article that you cited suggests that inflammation of the terminal ileum is somewhat rare with MC. That's incorrect. Actually, it's very likely that most (if not all) of us have inflammation of at least the terminal ileum as part of our MC inflammation pattern. Some researchers assume that the inflammation only extends into the terminal ileum (because that is as far as they can reach with a conventional colonoscope, and in many cases, not even the terminal ileum can be reached), but just because they cannot explore further into the ileum does not mean that inflammation does not exist there. It's very likely that the inflammation extends further into the ileum, and in some MC cases it's very possible that the entire small intestine may be inflamed. From pages 111–112 of the book:
And even though no mention of the small intestine is made in the diagnostic criteria for microscopic colitis, researchers have found that lymphocytic infiltration is frequently present in the small intestine of MC patients, and in some cases, villus damage is sufficient to justify a diagnosis of celiac disease. Even when the formal diagnostic criteria for celiac disease are not met, a significant number (over 10 %) of microscopic colitis patients show at least a Marsh 1 level of villus damage upon biopsy analysis of their small intestine.15
In fact, small intestinal involvement is quite common with MC.16 Other researchers have noted that the T helper cell type 1 mucosal cytokine response pattern exhibited by microscopic colitis is very similar to the response pattern of celiac disease.17 Most researchers have been unsure how to classify this type of information, since it implies non-celiac gluten sensitivity.18 Often, biopsy samples of the terminal ileum are taken during a colonoscopy exam, and upon examination under a microscope, those samples typically show lymphocytic infiltration for most patients who have MC.19
Koskela (2011) even noted that in general, the duodenum of patients with MC, excluding any patients who have celiac disease, have shorter villi than controls.19 Of course since no villi exist in the colon, villus atrophy cannot occur in the colon, but that is irrelevant to this comparison. According to Stewart et al. (2011) the association between celiac disease and microscopic colitis is so strong, that for someone diagnosed with either of the two diseases, the odds that they will also meet the diagnostic criteria of the other disease, has been shown to be approximately 50 times the level that would typically be expected in the general population.20
Other research shows that the correlation between MC and celiac disease may be much higher, as high as 70 times the probability that would normally be expected, when compared with the risk of someone in the general population developing microscopic colitis.21
Here are the references from that quote:
15. Simondi, D., Pellicano, R., Reggiani, S., Pallavicino, F., David, E., Sguazzini, C., . . . Astegiano, M. (2010). A retrospective study on a cohort of patients with lymphocytic colitis. Spanish Journal of Gastroenterology, 102(6), 381–384. Retrieved from
http://www.ncbi.nlm.nih.gov/pubmed/20575599
16. Moayyedi, P., O'Mahony, S., Jackson, P., Lynch, D. A., Dixon, M. F., & Axon, A. T. (1997). Small intestine in lymphocytic and collagenous colitis: mucosal morphology, permeability, and secretory immunity to gliadin. Journal of Clinical Pathology, 50(6), 527–529. Retrieved from
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC500002/
17. Tagkalidis, P. P., Gibson, P. R., & Bhathal, P. S. (2007). Microscopic colitis demonstrates a T helper cell type 1 mucosal cytokine profile. Journal of Clinical Pathology, 60(4), 382–387. doi:10.1136/jcp.2005.036376
18. Vande Voort, J. L., Murray, J. A., Lahr, B. D., Van Dyke, C. T., Kroning, C. M., Moore, B., & Wu, T-T. (2009). Lymphocytic duodenosis and the spectrum of celiac disease. American Journal of Gastroenterology, 104(1), 142–148. doi:10.1038/ajg.2008.7
19. Koskela, R. (2011). Microscopic colitis: Clinical features and gastroduodenal and immunogenic findings. (Doctoral dissertation, University of Oulu). Retrieved from
http://herkules.oulu.fi/isbn97895142941 ... 294150.pdf
20. Stewart, M., Andrews, C. N., Urbanski, S., Beck, P. L., & Storr, M. (2011). The association of coeliac disease and microscopic colitis: A large population-based study. Alimentary Pharmacology & Therapeutics, 33(12), 1340–1349. Retrieved from
http://www.medscape.com/viewarticle/743 ... mp&spon=20
21. Green, P. H., Yang, J., Cheng, J., Lee, A. R., Harper, J. W., & Bhagat, G. (2009). An association between microscopic colitis and celiac disease. Clinical Gastroenterology and Hepatology, 7(11), 1210–1216. Retrieved from
http://www.ncbi.nlm.nih.gov/pubmed/19631283
The pattern of bowel movements that you mentioned is very common with MC when at least partial healing has occurred. During the night the colon has time to work normally, and it manages to remove water from the lumen (because it has an extended period of time with no BMs), and so the first one may be formed. But if/when subsequent BMs are passed, not enough time has elapsed to allow for adequate water removal, so they become progressively less formed, due to increasing water retention.
I can't help but wonder if stress might play a role in the subsequent BMS — stress that is absent during sleep. And stress can also cause pain (which can cause increased stress, leading to a self-perpetuating problem).
Tex