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Modeling Colitis-Associated Cancer with Azoxymethane (AOM) and Dextran Sulfate Sodium (DSS)

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Localized amyloid tumor in small bowel.

M O Peny¹, J C Debongnie, J Haot

¹Department of Pathology, Erasme University Hospital, Brussels, Belgium.

Digestive Diseases and Sciences

|October 29, 2000

Summary

Localized jejunal amyloidosis is a rare condition presenting as polypoid formations and causing digestive bleeding, especially in patients on anticoagulation. Histology reveals significant amyloid infiltration with characteristic birefringence.

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Area of Science:

Gastroenterology
Pathology
Hematology

Background:

Digestive bleeding is a common complication, particularly in patients on oral anticoagulation therapy.
Localized amyloidosis, though rare, can affect various organs, including the gastrointestinal tract.

Observation:

A 74-year-old male on oral anticoagulation presented with an episode of digestive bleeding.
Endoscopic examination revealed polypoid, pseudotumoral formations in the jejunum.

Findings:

Histopathological analysis confirmed localized jejunal amyloidosis.
Massive amyloid infiltration was observed in submucosal connective tissues, muscularis mucosae, and blood vessel walls.
Amyloid deposits exhibited characteristic red/green birefringence under polarized light microscopy.

Implications:

This case highlights a rare cause of gastrointestinal bleeding that can mimic malignancy.
Recognition of this entity is crucial for accurate diagnosis and appropriate patient management.
Further research may elucidate the specific mechanisms and risk factors associated with jejunal amyloidosis.