Gastrointestinal amyloidosis is relatively common, although symptomatic involvement is more rare. It is diagnosed if there are persistent gastrointestinal (GI) symptoms with endoscopic biopsy proven amyloid deposition.
Tends to affect middle-aged and older patients.
Weight loss (most common) and GI bleeding are the main symptoms. Other symptoms include gastro-esophageal reflux, constipation, nausea, diarrhea, weight loss, early satiety, and abdominal pain.
Bowel changes result from amyloid infiltration of the muscularis and destruction of Auerbach plexus.
- duodenum (most common)
- stomach (second most common): the gastric manifestations of amyloidosis include gastric fold and or wall thickening and rigidity. Luminal narrowing can cause a linitis plastica type appearance and mimic gastric carcinoma.
- colon and rectum
Radiological findings are rare and non-specific, unlike the pathologic high specificity.
On fluoroscopy, the gastric mucosa may display thickened folds, which may appear nodular or mass-like and which may contain calcifications.
- diffuse wall thickening of the involved segment of bowel
- dilatation depending upon the degree of hypomotility; GI bleeding can also cause dilated bowel loops with fluid levels
- luminal narrowing either due to amyloid infiltration or secondary to ischemia
- infectious enteritis (e.g. Shigella, Salmonella, Escherichia coli, cytomegalovirus, Cryptococcus, pseudomembranous colitis, AIDS)
- bowel ischemia
- other infiltrating processes, e.g. small bowel lymphoma
- other causes of GI bleeding
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