Inflammatory Fibroid Polyps of the Gastrointestinal Tract: Clinical, Pathologic, and Molecular Characteristics

John A. Ozolek, Eizaburo Sasatomi, Patricia A. Swalsky, Uma Rao, Alyssa Krasinskas, Sydney D. Finkelstein

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


Inflammatory fibroid polyp (IFP) of the gastrointestinal tract is an uncommon proliferative lesion. When sampled by biopsy, IFP can be mistaken for various lesions, from granulation tissue to high-grade sarcoma. We present an unusual case of IFP and review a large series of IFPs to characterize clinical, histologic, and molecular features of diagnostic value. A total of 42 IFPs were gathered from the pathology archives of the University of Pittsburgh Medical Center over the past 22 years. Clinical, histopathologic, and immunohistochemical features were collected. A random subset of IFPs (n = 12) underwent microdissection genotyping for a broad panel of tumor suppressor gene-associated mutations (loss of heterozygosity). IFPs occurred in both sexes (male, 17; female, 25) over a broad age range (29-85 years). IFPs varied in size from 0.2 to 8 cm. The stomach (n = 19) was the most common location, followed by large bowel (n = 13) and small bowel (n = 10). Most IFPs displayed typical morphologic features (eosinophils admixed with loose, mature fibrous tissue), and in 2 instances, sampled by biopsy, IFP was confused for sarcoma. All IFPs lacked c-kit staining. No mutations were identified in any IFPs examined. IFP is a clinically underrecognized entity with unique morphologic and immunohistochemical features. On biopsy alone, the differential diagnosis may include sarcoma and other malignancies. The absence of mutational change may help to exclude malignant lesions.

Original languageEnglish (US)
Pages (from-to)59-66
Number of pages8
JournalApplied Immunohistochemistry and Molecular Morphology
Issue number1
StatePublished - Mar 2004
Externally publishedYes


  • Inflammatory fibroid polyp
  • Molecular

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology
  • Medical Laboratory Technology


Dive into the research topics of 'Inflammatory Fibroid Polyps of the Gastrointestinal Tract: Clinical, Pathologic, and Molecular Characteristics'. Together they form a unique fingerprint.

Cite this