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Intestinal Villous Oedema: Causes, Symptoms & Treatment

Intestinal villous oedema is an abnormal swelling of the villi in the small intestine that can severely impair nutrient absorption. It often occurs in chronic inflammatory bowel diseases.

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Things worth knowing about "Intestinal villous oedema"

Intestinal villous oedema is an abnormal swelling of the villi in the small intestine that can severely impair nutrient absorption. It often occurs in chronic inflammatory bowel diseases.

What is Intestinal Villous Oedema?

Intestinal villous oedema refers to the fluid-filled swelling of the intestinal villi (villi intestinales) in the small intestine. The intestinal villi are small, finger-like projections of the intestinal mucosa that greatly increase the absorptive surface area of the small bowel. They are responsible for the uptake of nutrients, vitamins, minerals, and water. When these structures become oedematous, their function is significantly impaired, often resulting in malabsorption – a condition in which the body is unable to absorb nutrients adequately.

Causes

Intestinal villous oedema can be triggered by various underlying conditions and mechanisms:

Chronic inflammatory bowel disease (IBD): Conditions such as Crohn's disease and ulcerative colitis can cause inflammatory responses leading to oedema formation in the intestinal villi.
Coeliac disease: The immune-mediated reaction to gluten damages the intestinal villi and may include oedematous changes.
Lymphatic drainage disorders (intestinal lymphangiectasia): Dilation or obstruction of the lymphatic vessels in the bowel impairs the normal removal of fluid from the tissue.
Protein deficiency (hypoalbuminaemia): Low blood protein levels reduce oncotic pressure, causing fluid to leak into surrounding tissue.
Heart failure and liver disease: Systemic oedema can manifest in intestinal tissue.
Infectious gastroenteritis: Certain pathogens can cause inflammatory swelling of the intestinal mucosa.
Allergic reactions: Food allergies or exaggerated immune responses may trigger local oedematous reactions in the bowel.

Symptoms

The clinical signs of intestinal villous oedema are often non-specific and depend largely on the underlying condition. Typical complaints include:

Chronic or recurrent diarrhoea
Abdominal pain and bloating
Weight loss due to impaired nutrient absorption
Fatigue and general weakness (due to nutrient deficiencies)
Deficiency symptoms such as anaemia, vitamin D deficiency, or calcium deficiency
In severe cases: oedema in other parts of the body (e.g., legs), caused by protein loss through the gut (protein-losing enteropathy)

Diagnosis

The diagnosis of intestinal villous oedema is usually established through a combination of examinations:

Endoscopy with biopsy: A small bowel endoscopy with tissue sampling allows direct microscopic assessment of villous structure and mucosal condition (histology).
Capsule endoscopy: A video capsule enables evaluation of hard-to-reach sections of the small intestine.
Imaging procedures: Ultrasound, CT, or MRI of the abdomen can reveal changes in the intestinal wall and signs of oedema.
Laboratory tests: Blood count, albumin, total protein, electrolytes, vitamin levels, and specific antibodies (e.g., transglutaminase antibodies if coeliac disease is suspected).
Alpha-1-antitrypsin clearance: Used to diagnose protein-losing enteropathy.

Treatment

Treatment of intestinal villous oedema is primarily directed at the underlying cause:

Treating the underlying condition: In Crohn's disease or ulcerative colitis, anti-inflammatory medications (e.g., corticosteroids, immunosuppressants, biologics) are used. In coeliac disease, a strict gluten-free diet is essential.
Nutritional therapy: Targeted supplementation of vitamins, minerals, and protein is often required. In severe cases, enteral or parenteral nutrition may be necessary.
Management of lymphatic disorders: In intestinal lymphangiectasia, a low-fat diet enriched with medium-chain triglycerides (MCT fats) is recommended.
Albumin supplementation: Intravenous albumin may be indicated in cases of severe hypoalbuminaemia.
Anti-inflammatory therapy: In allergic or immunological causes, antiallergic or immunomodulatory treatment may be beneficial.

References

Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 11th ed. Elsevier, 2021.
Sartor, R. B.: Mechanisms of disease: pathogenesis of Crohn's disease and ulcerative colitis. Nature Clinical Practice Gastroenterology & Hepatology, 2006.
World Health Organization (WHO): Malnutrition. Fact Sheet. https://www.who.int/news-room/fact-sheets/detail/malnutrition (accessed 2024).

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