Globular amyloid deposits isolated to the small bowel: A rare association with AL amyloidosis

Patrick R. Hemmer, Mark D. Topazian, Morie A. Gertz, Susan C. Abraham

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We describe a 55-year-old man with isolated duodenal and jejunal amyloidosis producing rare endoscopic and histologic findings. The patient had no specific gastrointestinal complaints but underwent esophagogastroduodenoscopy and colonoscopy because of progressive microcytic anemia. Endoscopy revealed multiple polyps, some filiform and measuring up to 3 cm in length, in the duodenum and proximal jejunum. Microscopically, the polyps resulted from amyloid deposition, predominantly within the submucosa, but also focally involving muscularis mucosae and lamina propria. The amyloid formed multiple globular submucosal deposits with a lamellated appearance reminiscent of corpora amylacea; linear amyloid deposition was also present in a perivascular distribution and within the overlying mucosa. Immunophenotyping confirmed AL amyloidosis with λ immunoglobulin light chain restriction. There was no clinical evidence of visceral amyloidosis. The source of λ light chain production was unclear as bone marrow biopsy and multiple gastrointestinal biopsies revealed normal numbers of polyclonal plasma cells. Further, immunoglobulin-free light chain assay was normal, as were serum and urine protein electrophoreses with immunofixation. This endoscopic presentation of isolated small bowel polyposis is an uncommon association with AL amyloidosis and to our knowledge this represents the first case of globular gastrointestinal amyloidosis resulting from AL amyloid.

Original languageEnglish (US)
Pages (from-to)141-145
Number of pages5
JournalAmerican Journal of Surgical Pathology
Issue number1
StatePublished - Jan 2007


  • AL amyloid
  • Amyloidosis
  • Globular amyloid
  • Polyposis
  • Small intestine
  • λ light chain

ASJC Scopus subject areas

  • Anatomy
  • Surgery
  • Pathology and Forensic Medicine


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