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Enterolith (Intestinal Stone): Causes, Symptoms & Treatment

An enterolith is a hard, mineral concretion that forms inside the intestine. It can cause symptoms ranging from abdominal pain to intestinal obstruction in severe cases.

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Things worth knowing about "Enterolith"

An enterolith is a hard, mineral concretion that forms inside the intestine. It can cause symptoms ranging from abdominal pain to intestinal obstruction in severe cases.

What Is an Enterolith?

An enterolith (also known as an intestinal stone or intestinal calculus) is a hard, mineral deposit that forms within the gastrointestinal tract. The term derives from the Greek words enteron (intestine) and lithos (stone). Enteroliths can develop in various parts of the digestive system, but most commonly occur in the large intestine or within intestinal diverticula.

Causes and Formation

Enteroliths form when minerals – primarily magnesium ammonium phosphate, calcium phosphate, or calcium oxalate – accumulate and harden around a central nucleus, which may be a foreign body or an organic substance. Common causes and risk factors include:

Intestinal diverticula: Pouches in the intestinal wall where stool can stagnate and solidify into stones.
Short bowel syndrome: Patients with a shortened intestine have an increased risk due to impaired fluid and nutrient absorption.
Inflammatory bowel disease: Conditions such as Crohn's disease can promote enterolith formation.
Diet: A diet very low in fiber or high in certain minerals can encourage stone formation.
Ingested foreign bodies: These can serve as a nidus for mineral deposits.
Slowed intestinal motility: Constipation increases the risk of stone formation by prolonging contact of intestinal contents with the gut wall.

Symptoms

Small enteroliths are often asymptomatic and discovered incidentally. Larger stones or those obstructing the intestinal passage may cause:

Abdominal pain or cramping
Bloating and a feeling of fullness
Constipation or changes in bowel habits
Nausea and vomiting
In severe cases: intestinal obstruction (ileus) – a medical emergency requiring immediate treatment

Diagnosis

Enteroliths are typically identified using imaging techniques:

Abdominal X-ray: Calcified stones are often visible on plain radiographs.
Ultrasound: Can detect larger intestinal stones.
Computed tomography (CT scan): Considered the most accurate method for localizing and characterizing enteroliths.
Colonoscopy: Allows direct visualization of the stone and, in some cases, immediate removal.

Treatment

Treatment depends on the size, location, and symptoms caused by the enterolith:

Conservative management: Small, asymptomatic stones may be managed with laxatives and increased fluid intake.
Endoscopic removal: During colonoscopy, stones can often be fragmented and removed directly.
Surgical removal: Intestinal obstruction or very large stones may require surgical intervention.
Treatment of the underlying cause: Addressing the root condition (e.g., diverticular disease, Crohn's disease) is important to prevent recurrence.

Prevention

A high-fiber diet, adequate fluid intake, and regular physical activity help to maintain healthy bowel motility and reduce the risk of enterolith formation. Patients with known risk factors should undergo regular medical check-ups and follow their physician's recommendations.

References

Kasper, D. L. et al. – Harrison's Principles of Internal Medicine, 20th Edition, McGraw-Hill Education, 2018.
Townsend, C. M. et al. – Sabiston Textbook of Surgery, 21st Edition, Elsevier, 2021.
Fielding, J. F. – Enterolithiasis. In: BMJ Clinical Evidence, PubMed, NCBI (https://www.ncbi.nlm.nih.gov).

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