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Inflammatory Bowel Disease II: Ulcerative Colitis01:20

Inflammatory Bowel Disease II: Ulcerative Colitis

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Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal...
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Diverticular disease involves the formation of diverticula—small sac-like outpouchings of the colonic wall—and their complications. It most commonly affects the sigmoid colon due to higher intraluminal pressure and structural vulnerability. It results from structural weakness and increased pressure in the colon, producing pseudodiverticula that may remain silent or progress to inflammation and serious complications.Structure of DiverticulaIn diverticulosis, these outpouchings are...
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Inflammatory Bowel Disease I: Ulcerative Colitis01:27

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Inflammatory bowel disease is a group of chronic disorders marked by recurrent inflammation of the gastrointestinal tract due to an abnormal immune response against gut microflora. This leads to tissue damage. The two main forms are Crohn’s disease and ulcerative colitis.Crohn’s DiseaseCrohn’s disease is a relapsing inflammatory disorder that can affect any part of the GI tract, from the mouth to the anus. It involves all layers of the bowel wall (transmural) and shows...
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Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid...
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Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
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Pseudomembranous Colitis: Not Always Caused by Clostridium difficile.

Derek M Tang1, Nathalie H Urrunaga1, Hannah De Groot1

  • 1Division of Gastroenterology & Hepatology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA.

Case Reports in Medicine
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Summary
This summary is machine-generated.

Pseudomembranous colitis can stem from various causes beyond Clostridium difficile. This case shows chronic ischemia mimicking C. difficile infection, emphasizing the need for broader differential diagnoses in colitis.

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Area of Science:

  • Gastroenterology
  • Colorectal Diseases
  • Pathology

Background:

  • Pseudomembranous colitis is classically attributed to Clostridium difficile.
  • However, multiple other factors, including medications, ischemia, and inflammatory conditions, can induce pseudomembrane formation.
  • Accurate diagnosis is crucial for appropriate treatment and patient outcomes.

Purpose of the Study:

  • To present a case of pseudomembranous colitis misdiagnosed as Clostridium difficile infection.
  • To highlight chronic ischemia as a potential, often overlooked, cause of pseudomembranous colitis.
  • To emphasize the importance of considering non-C. difficile etiologies in the differential diagnosis of pseudomembranous colitis.

Main Methods:

  • Case report of a middle-aged woman with vascular disease.
  • Initial diagnosis based on pseudomembrane presence, presumed to be C. difficile infection.
  • Diagnostic workup included advanced imaging, endoscopy, and detailed histopathological examination.

Main Results:

  • The patient was initially treated for refractory C. difficile infection without improvement.
  • Subsequent investigations revealed chronic ischemia as the underlying cause of colitis and pseudomembrane formation.
  • Histopathology confirmed ischemic injury rather than infectious etiology.

Conclusions:

  • Pseudomembranous colitis can arise from diverse causes, not solely C. difficile.
  • Chronic ischemia is a significant differential diagnosis for pseudomembranous colitis, particularly in patients with vascular disease.
  • Gastroenterologists must maintain a high index of suspicion for alternative etiologies to ensure correct diagnosis and management of colitis.