The gastrointestinal (GI) tract is colonized by a dense community of commensal microorganisms referred to as the gut microbiota. The gut microbiota and the host have co-evolved, and they engage in a myriad of immunogenic and metabolic interactions. The gut microbiota contributes to the maintenance of host health. However, when healthy microbial structure is perturbed, a condition termed dysbiosis, the altered gut microbiota can trigger the development of various GI diseases including inflammatory bowel disease, colon cancer, celiac disease, and irritable bowel syndrome. There is a growing body of evidence suggesting that multiple intrinsic and extrinsic factors, such as genetic variations, diet, stress, and medication, can dramatically affect the balance of the gut microbiota. Therefore, these factors regulate the development and progression of GI diseases by inducing dysbiosis. Herein, we will review the recent advances in the field, focusing on the mechanisms through which intrinsic and extrinsic factors induce dysbiosis and the role a dysbiotic microbiota plays in the pathogenesis of GI diseases.
Celiac Disease ; Colon ; Colonic Neoplasms ; Diet ; Dysbiosis ; Gastrointestinal Diseases* ; Genetic Variation ; Inflammatory Bowel Diseases ; Irritable Bowel Syndrome ; Microbiota*

BACKGROUND: Colonic neoplasm is associated with western diet intake and physical inactivity. These life styles are also risk factors for dyslipidemia and metabolic syndrome. The aim of this study was to evaluate the association between dyslipidemia and the prevalence of colon polyps including colon adenoma as a precancerous lesion of colonic neoplasms. METHODS: We selected subjects undergoing a colonoscopy for health screening at the Health Promotion Center of Eulji General Hospital from January 2006 to June 2010. Subjects with histories of cancers, dyslipidemia treatment, and other intestinal diseases like Crohn's disease and ulcerative colitis were excluded. The total numbers of subjects included in the study was 605. Chi-square test and t-test and were used for the analysis. Additionally we used multivariate logistic regression to adjust for sex, age, smoking, drinking, and other risk factors. RESULTS: The prevalence of colon polyps was 48.70% and 28.05% in males and females, respectively. When adjusting for variables that included age, body mass index, hypertension, diabetes mellitus, smoking, drinking, and exercise, dyslipidemia was not significantly associated with the prevalence of colon polyps. However upon analyzing adenomatous colon polyps in men, dyslipidemias due to triglycerides and high density lipoproteins were significant factors (odds ratio [OR], 2.13; confidence interval [CI], 1.14 to 3.98; OR, 2.24; CI, 1.15 to 4.34, respectively). CONCLUSION: Dyslipidemia was not a significant factor in the prevalence of colon polyps. However it had a significant association with the prevalence of adenomatous colon polyps in men.
Adenoma ; Body Mass Index ; Colitis, Ulcerative ; Colon* ; Colonic Neoplasms ; Colonic Polyps ; Colonoscopy ; Crohn Disease ; Diabetes Mellitus ; Diet ; Drinking ; Dyslipidemias* ; Female ; Health Promotion ; Hospitals, General ; Humans ; Hypertension ; Intestinal Diseases ; Life Style ; Lipoproteins, HDL ; Logistic Models ; Male ; Mass Screening ; Polyps* ; Prevalence* ; Risk Factors ; Smoke ; Smoking ; Triglycerides

Acute colonic pseudoobstruction was first reported in 1948 by Sir H. Ogilvie. It is characterized by an acute, abrupt right-sided colonic distention in the absence of physical reasons for obstruction. If untreated, it may progress to cecal perforation, peritonitis, and death. Although primary cases have been reported, 87 percent of cases were secondary results of medical or surgical conditions. The most common medical conditions were infections, cardiac disease, and neurologic problems. In surgical conditions, cesarean section has been reported as the most common cause of Ogilvie's syndrome. In 1995, the first case of Ogilvie's syndrome complicated after a cosmetic surgical procedure(abdominoplasty) was reported by Bradley et al. We report a case of Ogilvie's syndrome complicated after breast reconstruction with TRAM flap that developed in the postoperative third day in 35-year old woman. The complications are primarily related to decreased flap perfusion. No reference of intestinal pseudoobstruction was found in the literature conducted in regard to complications of TRAM flap breast reconstruction.
Adult ; Breast* ; Cesarean Section ; Colon ; Colonic Pseudo-Obstruction ; Female ; Heart Diseases ; Humans ; Intestinal Pseudo-Obstruction ; Mammaplasty* ; Perfusion ; Peritonitis ; Pregnancy

Patients with ulcerative colitis (UC) have the increased risk of colorectal cancer. The risk of colorectal cancer development in UC is associated with the extent of colitis and duration of disease. It is generally agreed that there is little or no increased risk associated with proctitis or proctosigmoiditis. A dysplasia-associated lesion or mass (DALM) is difficult to distinguish from sporadic adenoma. The DALM indicate a high association with colon cancer. The presence of DALM as a premalignant lesion has been considered as an indication for colectomy because of the high risk of progression to malignancy within a short period. We report a case of polyp with high grade dysplasia in a 27-year-old man of ulcerative colitis confined to rectum and sigmoid colon.
Adenoma ; Adult ; Colectomy ; Colitis ; Colitis, Ulcerative* ; Colon, Sigmoid ; Colonic Neoplasms ; Colorectal Neoplasms ; Humans ; Polyps* ; Proctitis ; Proctocolitis ; Rectum ; Ulcer*

Adult celiac disease is a chronic intestinal disorder that has been estimated to affect up to 1-2% of the population in some nations. Awareness of the disease has increased, but still it remains markedly underdiagnosed. Celiac disease is a pathologically defined condition with several characteristic clinical scenarios that should lead the clinician to suspect its presence. Critical to diagnosis is a documented responsiveness to a gluten-free diet. After diagnosis and treatment, symptoms and biopsy-proven changes may recur and appear refractory to a gluten-free diet. Recurrent symptoms are most often due to poor diet compliance, a ubiquitous and unrecognized gluten source, an initially incorrect diagnosis, or an associated disease or complication of celiac disease. Some patients with persistent symptoms and biopsy-proven changes may not have celiac disease at all, instead suffering from a sprue-like intestinal disease, so-called unclassified sprue, which is a specific entity that does not appear to respond to a gluten-free diet. Some of these patients eventually prove to have an underlying malignant cause, particularly lymphoma. The risk of developing lymphoma and other malignancies is increased in celiac disease, especially if initially diagnosed in the elderly, or late in the clinical course of the disease. However, recent studies suggest that the risk of gastric and colon cancer is low. This has led to the hypothesis that untreated celiac disease may be protective, possibly due to impaired absorption and more rapid excretion of fat or fat-soluble agents, including hydrocarbons and other putative cocarcinogens, which are implicated in the pathogenesis of colorectal cancer.
Absorption ; Adult ; Aged ; Celiac Disease ; Colonic Neoplasms ; Colorectal Neoplasms ; Compliance ; Diet ; Diet, Gluten-Free ; Glutens ; Humans ; Hydrocarbons ; Intestinal Diseases ; Lymphoma ; Stress, Psychological

Tuberculous involvement of the colon is an uncommon clinical entity. Other colonic disease which should be considered in the differential diagnosis include inflammatory bowel disease such as Crohn's disease, ulcerative colitis and colon cancer. Intestinal tuberculosis most frequently involves the ileocecal area. The common presenting symptoms are abdominal pain, fever, weight loss and malabsorption. Pathologically, tuberculous colitis may present as an ulcerative type, hypertrophic type or in combination. Massive bleeding is said to be very rare even in the ulcerative type because of an obliterative endarteritis. We report a case of colonic tuberculosis presenting with massive bleeding in 52-year-old man with alcoholic liver cirrhosis, which was diagnosed by colonoscopic biopsy and acid-fast stain.
Abdominal Pain ; Biopsy ; Colitis ; Colitis, Ulcerative ; Colon* ; Colonic Diseases ; Colonic Neoplasms ; Crohn Disease ; Diagnosis, Differential ; Endarteritis ; Fever ; Hemorrhage* ; Humans ; Inflammatory Bowel Diseases ; Liver Cirrhosis, Alcoholic ; Middle Aged ; Tuberculosis* ; Ulcer ; Weight Loss

A broad spectrum of colonic complications can occur in patients with colon cancer. Clinically, some of these complications can obscure the presence of underlying malignancies in the colon and these complications may require emergency surgical management. The complications of the colon that can be associated with colon cancer include obstruction, perforation, abscess formation, acute appendicitis, ischemic colitis and intussusception. Although the majority of these complications only rarely occur, familiarity with the various manifestations of colon cancer complications will facilitate making an accurate diagnosis and administering prompt management in these situations. The purpose of this pictorial essay is to review the CT appearance of the colonic complications associated with colon cancer.
Abdominal Abscess/complications/radiography ; Adult ; Aged ; Aged, 80 and over ; Appendicitis/complications/radiography ; Colitis, Ischemic/complications/radiography ; Colon/*radiography ; Colonic Diseases/complications/radiography ; Colonic Neoplasms/*complications/*radiography ; Female ; Humans ; Intestinal Diseases/*complications/*radiography ; Intestinal Obstruction/complications/radiography ; Intussusception/complications/radiography ; Male ; Middle Aged ; Tomography, X-Ray Computed/*methods

Chronic colonic pseudo-obstruction is a rare disease that results in colorectal dilatation without any obstructing lesions. Colonic dilatation does not usually cause colonic wall thickening and colonic visceral myopathy with muscular hypertrophy has not been reported in Korea. A 31-year-old female patient was transferred for treatment of refractory constipation accompanied by megacolon. She had suffered from recurrent attacks of severe abdominal pain with the sensation of a mass in the left lower quadrant. An abdominal CT revealed a large luminal dilatation of the sigmoid colon where massive stool was impacted. There was no obstructing lesion or luminal dilatation of the rectum. To relieve her refractory symptoms, a total colectomy with an ileorectal anastomosis was performed. Pathologic examination of the sigmoid colon revealed that the muscle layers were dysplastic and hypertrophied, and the innervations into the muscle fibers were markedly decreased. She was discharged without any intra-abdominal symptoms.
Abdominal Pain ; Adult ; Colectomy ; Colon ; Colon, Sigmoid ; Colonic Pseudo-Obstruction ; Constipation ; Dilatation ; Female ; Humans ; Hypertrophy ; Intestinal Pseudo-Obstruction ; Korea ; Megacolon ; Muscles ; Phenobarbital ; Rare Diseases ; Rectum ; Sensation

No abstract availble.
Colonic Diseases, Functional/diagnosis/physiopathology ; Humans ; *Irritable Bowel Syndrome/diagnosis/physiopathology

Inflammatory bowel disease has a potential risk of developing colorectal cancer. However, there is little causal relationship between intestinal tuberculosis and colon cancer because intestinal tuberculosis is curable disease and has relatively short disease course. But there were a few case reports of intestinal tuberculosis associated with colon cancer. Diffuse infiltrating colon cancer, characterized by tumor cells in the presence of inflammatory changes with much fibrosis, is very rare in the colon. We experienced a 49-year-old woman who had tuberculous colitis combined with diffuse infiltrative colon cancer. She visited our hospital because of chronic diarrhea and abdominal pain. Colonoscopy showed multiple geographic ulcers in the transverse colon and partial intestinal obstruction. Histological examination revealed non-caseating granuloma and Mycobacterium tuberculosis was cultured in biopsied tissue. She took an anti-tuberculosis drug for 2 weeks, but her symptoms were aggravated. Therefore, extended right hemicolectomy was performed and revealed mucin-secreting, diffuse infiltrating adenocarcinoma. Herein, we report a rare case of diffuse infiltrative colon cancer coexisting with colonic tuberculosis with a review of liferatures.
Abdominal Pain ; Adenocarcinoma ; Colitis ; Colon* ; Colon, Transverse ; Colonic Neoplasms* ; Colonoscopy ; Colorectal Neoplasms ; Diarrhea ; Female ; Fibrosis ; Granuloma ; Humans ; Inflammatory Bowel Diseases ; Intestinal Obstruction ; Middle Aged ; Mycobacterium tuberculosis ; Tuberculosis* ; Ulcer