The etiological profile of chronic organic non-bloody diarrhea in India: Emergence of inflammatory bowel disease as a dominant cause.

BACKGROUND: Chronic non-bloody diarrhea may be attributed either to functional or organic diseases. The latter category may present with malabsorption syndrome if there is extensive involvement of the small bowel, whereas diseases of the large bowel may only present with diarrhea sans malabsorption. Indian data has predominantly focussed on the etiological spectrum of malabsorption syndrome in adults. The primary aim of the current study was to evaluate etiological spectrum of chronic organic non-bloody diarrhea in India. METHODS: This prospective observational study was done at a tertiary care hospital in North India. Patients ≥ 18 years presenting with chronic non-bloody diarrhea of > 4 weeks duration were enrolled in the study after exclusion of patients with IBS and anal incontinence. RESULTS: During the study period of 12 months, 100 patients with chronic organic non-bloody diarrhea were evaluated. A definite etiological diagnosis was made in 97 patients (97%). The mean age of the patients was 48 ± 16.7 years (58% males). The median duration of diarrhea was 5.5 months (interquartile range [IQR] 3.5, 11). Inflammatory bowel disease (IBD) accounted for 45% of the cases making it the predominant cause for organic diarrhea. GI infections and adult-onset celiac disease accounted for 18% and 9% of the cases, respectively. Pancreatic disease, benign or neoplastic, accounted for 6% of the total cases. Notably, gastrointestinal (GI) malignancies manifesting as chronic non-bloody diarrhea were diagnosed in 5% of the patients. CONCLUSION: Our data suggests a paradigm shift in the etiological spectrum of chronic organic non-bloody diarrhea in India with the emergence of IBD as the predominant cause displacing GI infections.

Ileocolonic Intussusception Secondary to Colon Cancer: A Rare Cause of Abdominal Pain In Adults.

Intussusception, defined as the telescoping of one segment of the gastrointestinal tract into an adjacent one, is a rare cause of abdominal pain in the adult population due to underlying benign or malignant pathology. With the liberal use of CT in the evaluation of patients with abdominal pain, the diagnosis became more reliable. Resection of the bowel segment is the recommended treatment in most cases. We are presenting the case of a 76-year-old male patient who presented with a three-week history of abdominal pain and diarrhea. The evaluation was consistent with ileocolic intussusception. Robotic resection of the right colon was performed. Pathology revealed poorly differentiated adenocarcinoma of the cecum as the underlying pathology.

An Interesting Case of Asymptomatic Cholera in the Setting of Large Bowel Obstruction.

Vibrio cholerae is the culprit behind many endemics globally. Classically characterized by profuse diarrhea with a "rice water" description, cholera can be fatal if not treated promptly. However, infected individuals can present with little to no symptoms. These individuals allow for a carrier state and play a large part in the survival of an endemic. Asymptomatic patients can present in areas where Cholera is not endemic. Herein, we present an atypical case of vibrio chloerae infection without diarrhea in the setting of large bowel obstruction secondary to colon cancer. We aim to highlight the unusual presentation of a cholera infection.

A Gut-Wrenching Feeling: Overcoming Cognitive Biases in an Atypical Presentation of Chronic Mesenteric Ischemia.

Chronic mesenteric ischemia is a rare but serious condition that can present with a variety of symptoms, including abdominal pain, diarrhea, and weight loss. Our case report presents a 63-year-old male with a past medical history of generalized anxiety disorder, Barrett's esophagus, hypertension, hyperlipidemia, chronic obstructive pulmonary disease (COPD) with active smoking who initially presented with severe diffuse abdominal pain, nausea, vomiting, and chronic diarrhea resulting in malnutrition and 40-pound weight loss over a six-month span. The patient underwent extensive diagnostic evaluation and was diagnosed with Yersinia gastroenteritis via gastroenteritis panel (GI Panel), explaining all of the patient's symptoms. The patient underwent treatment for said gastroenteritis but did not experience remission of symptoms, leading to further diagnostic evaluations; a definitive diagnosis was not found, yet the patient's symptoms persisted. The patient then underwent extensive serologic and endoscopic evaluation, after extensive imaging and diagnostic work-up, the patient was finally diagnosed with chronic mesenteric ischemia (CMI) of the superior mesenteric artery (SMA) with severe celiac and inferior mesenteric artery (IMA) stenosis. The patient initially underwent stenting (7 mm by 26 mm Balloon Mounted LifestreamTM Covered Stent; Becton Dickson (BD); Franklin Lakes, NJ, USA), which provided temporary relief to his symptoms, however, the relief did not last long. Upon reimaging, the patient was found to have stenosis of the stent, leading to the eventual placement of a bare-metal stent (ExpressTM LD 7 x 27 mm balloon mounted bare-metal stent; Boston Scientific; Boston, MA, USA) across the celiac artery as well as the placement of an IMA stent (InnovaTM Self-expanding 5 x 20 mm bare-metal stent; Boston Scientific). This eventually resulted in the resolution of the patient's symptoms, eventual weight gain, and improvement in quality of life.

An Unusual Case of Pyrexia of Unknown Origin.

A previously fit and well 29-year-old man with no significant recent travel or contact history presented to the hospital with 11 days of feeling unwell, intermittent diarrhea, abdominal pain and a skin rash that was consistent with folliculitis. Despite resolution of these index symptoms he continued with recurring fever of 38.5 degrees centigrade and weight loss of six Kilograms over the next three weeks. Extensive investigations to find a cause for the unexplained persistent fever failed to reveal an etiology, hence fulfilling pyrexia of unknown origin definition (PUO). None of the three main causes of PUO, namely infections, autoimmune diseases or underlying malignancy, were confidently found. Colonoscopy was suggested following a review of the abdominal CT scan to investigate possible thickening of the bowel wall. A diagnosis of atypically presenting Crohn's disease was eventually made and confirmed by colonoscopy and histology. The fever responded promptly to treatment of the Crohn's disease and he remained well at follow-up at six and 12 months after the initial presentation. In conclusion, it is important to keep in mind that PUO can be a rare initial presentation of inflammatory bowel disease in young adults with little or no gastrointestinal symptoms.

Low prevalence of colorectal neoplasia in microscopic colitis: A large prospective multi-center study.

BACKGROUND AND AIMS: Microscopic colitis (MC) is the most frequent condition in subjects undergoing ileocolonoscopy for chronic non-bloody diarrhea (CNBD) in Western countries. Emerging evidence has shown a negative association between MC and colorectal cancer. Within this prospective multi-center study we have evaluated the risk of colorectal neoplasia in MC and non-MC patients with CNBD receiving ileocolonoscopy with high-definition plus virtual chromoendoscopic imaging and histopathological assessment. METHODS: Patients with CNBD of unknown origin were prospectively enrolled in 5 referral centers in Northern Italy for ileocolonoscopy with high-definition and digital/optical chromoendoscopy plus multiple biopsies in each segment. The prevalence of colorectal neoplasia (cancer, adenoma, serrated lesion) in MC was compared to that observed in a control group including CNBD patients negative for MC, inflammatory bowel disease or eosinophilic colitis. RESULTS: From 2014 and 2017, 546 consecutive CNBD patients were recruited. Among the 492 patients (mean age 53±18 years) fulfilling the inclusion criteria against the exclusion critieria, MC was the predominant diagnosis at histopathological assessment (8.7%: N=43, 28 CC, 15 LC). The regression model adjusted for age and gender showed a significant negative association between the diagnosis of CM and colorectal neoplasia (OR=0.39; 95% CI 0.22-0.67, p <0.001) with a 60% decreased risk of adenomatous and neoplastic serrated polyps as compared to the control group (n=412). CONCLUSION: This multi-center study confirms MC as a low-risk condition for colorectal neoplasia. No surveillance colonoscopy program is to be performed for MC diagnosis.

Unusual case presentation of intestinal Sarcocystis hominis infection in a healthy adult.

INTRODUCTION: Sarcocystosis is mainly a veterinary problem; however, humans can serve as the definitive host for at least two species (Sarcocystis hominis and Sarcocystis suihominis). Intestinal infections occur in the definitive host after ingesting the intramuscular cysts (sarcocysts) in the intermediate host, which initiate sexual stages in the intestine that terminate in oocysts excreted in the faeces. CASE PRESENTATION: A 19-year-old male presented with diffuse abdominal pain, watery non-bloody diarrhoea, nausea, vomiting and intermittent low-grade fever that lasted for more than 3 weeks. Multiple stool cultures on enriched and selective media gave negative results. Microscopic examination of wet mounts of stool prepared from formalin/ethyl acetate concentrates, together with permanent staining helped in making a definitive diagnosis and ruling out other coccidian parasites. Diagnosis of the parasite as S. hominis was made based on the size and morphology of the individual sporocysts that were observed in the wet-mount preparations. This severe case of intestinal sarcocystosis in a healthy adult after eating undercooked beef shawarma meat is described. CONCLUSION: The unusual presentation of intestinal sarcocystis described in this case is very rare. The clinical signs and size and morphology of both oocysts and sarcocysts observed in concentrated wet mounts of stool helped in the definitive diagnosis. The food ingested prior to the appearance of symptoms was important in making the definitive diagnosis of the parasite as S. hominis, as well as the incubation period and treatment.