Collagenous colitis

Micrograph of collagenous colitis. H&E stain.
Specialty| Gastroenterology

Collagenous colitis is an inflammatory bowel disease affecting the colon specifically with peak incidence in the 5th decade of life, affecting women more than men. Its clinical presentation involves watery diarrhea in the absence of rectal bleeding. It is often classified under the umbrella entity microscopic colitis, that it shares with a related condition, lymphocytic colitis.[1]

## Contents

* 1 Signs and symptoms
* 2 Causes
* 3 Diagnosis
* 4 Treatment
* 5 See also
* 6 References
* 7 External links

## Signs and symptoms

Microscopic colitis causes chronic watery diarrhea with greater than 10 bowel movements per day. Some patients report nocturnal diarrhea, abdominal pain, urgency, fecal incontinence, fatigue, dehydration and weight loss. Patients report a significantly diminished quality of life.[1][2]

## Causes

The cause of collagenous colitis is unknown.[1]

## Diagnosis

On colonoscopy, the mucosa of the colon typically looks normal, but biopsies of affected tissue usually show deposition of collagen in the lamina propria, which is the area of connective tissue between colonic glands. Radiological tests, such as a barium enema are also typically normal.[2]

## Treatment

First line treatment for collagenous colitis is the use of budesonide, a steroid that works locally in the colon and is highly cleared by first pass effect. Other medications that can be used are the following:[1][2]

* Bismuth agents, including Pepto-Bismol
* 5-aminosalicylic acid
* Immunosuppressants, including azathioprine
* Infliximab

Pilot-scale studies have shown some evidence of possible benefit for both Boswellia serrata extract and specific strains of probiotics in the treatment of collagenous colitis, although larger sample sizes are needed to confirm the results.[3][4][5]

## See also

* Colitis
* Lymphocytic colitis
* Inflammatory bowel disease
* Ulcerative colitis

## References

1. ↑ 1.0 1.1 1.2 1.3 Park, Tina; Cave, David; Marshall, Christopher (2015-08-07). "Microscopic colitis: A review of etiology, treatment and refractory disease". World Journal of Gastroenterology 21 (29): 8804–8810. doi:10.3748/wjg.v21.i29.8804. ISSN 1007-9327. PMID 26269669.
2. ↑ 2.0 2.1 2.2 O’Toole, Aoibhlinn (2016-02-10). "Optimal management of collagenous colitis: a review". Clinical and Experimental Gastroenterology 9: 31–39. doi:10.2147/CEG.S67233. ISSN 1178-7023. PMID 26929656.
3. ↑ "Boswellia serrata extract for the treatment of collagenous colitis. A double-blind, randomized, placebo-controlled, multicenter trial". International Journal of Colorectal Disease 22 (12): 1445–51. Dec 2007. doi:10.1007/s00384-007-0364-1. PMID 17764013.
4. ↑ "Probiotic treatment of collagenous colitis: a randomized, double-blind, placebo-controlled trial with Lactobacillus acidophilus and Bifidobacterium animalis subsp. lactis". Inflammatory Bowel Diseases 12 (5): 395–401. May 2006. doi:10.1097/01.MIB.0000218763.99334.49. PMID 16670529.
5. ↑ "The probiotic E. coli strain Nissle 1917 for the treatment of collagenous colitis: first results of an open-label trial". Zeitschrift für Gastroenterologie 42 (5): 365–9. May 2004. doi:10.1055/s-2004-812709. PMID 15136935.

## External links

Classification|

* ICD-10-CM: K52.831
* MeSH: D046729
* DiseasesDB: 2955

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External resources|

* eMedicine: med/1351

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