Inflammatory fibroid polyp of the small intestine: Ultrastructural and immunohistochemical observations

Saul Suster, Morton J. Robinson, Arkadi M. Rywlin

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


The ultrastructural and immunohistochemical features of a primary tumor of the ileum showing the classic histologic features of an inflammatory fibroid polyp (IFP) of the gastrointestinal tract are presented. Ultrastructurally the proliferating cells showed a combination of fibroblastic and histio cytic features, with abundant rough endoplasmic reticulum and active production of collagen in many of the cells and long, dendritic cytoplasmic projections with large cytoplasmic vacuoles containing remnants of phagocytosed cellular debris in others. Immunohistochemical studies showed strong cytoplasmic positivity in the proliferating cells with vi mentin antibodies and scattered positivity with muramidase. Additional findings include the ultra structural demonstration of oligocilia and occasional primitive intercellular junctions. The findings in this case suggest that IFP may represent a proliferation of primitive submucosal stromal cells exhibiting incomplete fibrohistiocytic differentiation.

Original languageEnglish (US)
Pages (from-to)109-119
Number of pages11
JournalUltrastructural Pathology
Issue number2
StatePublished - 1990


  • Benign fibrohistiocytic tumors
  • Immunohisto-chemistry
  • Inflammatory fibroid polyp
  • Oligocilia

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Structural Biology
  • Instrumentation


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