Inflammatory pseudotumor of the stomach: Report of a highly infiltrative case with electron microscopic and immunohistochemical studies

Kenichi Kojimahara, Makio Mukai, Kazuto Yamazaki, Taketo Yamada, Tatsuro Katayama, Koh Nakada, Shigeto Uematsu, Akira Umezono, Yasuhiro Hosoda

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

A large, poorly demarcated, elevated lesion over the area ranging from the lower end of the esophagus to the lesser curvature of the cardiac region was examined in a 19 year old woman, and demonstrated an irregular and highly infiltrative proliferation of spindle cells over the full thickness of the gastric wall. Although the spindle cells grew mainly in the submucosa, they penetrated the muscularis propria, leaving intact muscle tissue that formed an irregular, island‐like pattern, and reached the subserosa. The cells were identified as myofibroblasts by light microscopy, immuno‐histochemistry and electron microscopy. The present case is considered to be of an inflammatory pseudotumor due to extremely infiltrative growth of myofibroblasts. This lesion differed from inflammatory fibroid polyp (similarly consisting of proliferating myofibroblasts accompanied by inflammatory cells) in terms of age at onset, tumor size, pattern of cell proliferation and main inflammatory cell component. This report also discusses the relationship between this lesion and a very recently advocated new entity, inflammatory fibrosarcoma of the mesentery and retroperito‐neum, which is a tumour closely simulating inflammatory pseudotumor.

Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalPathology international
Volume43
Issue number1-2
DOIs
Publication statusPublished - 1993 Jan

Keywords

  • inflammatory fibroid tumor
  • inflammatory fibrosarco. ma
  • inflammatory pseudotumor
  • myofibroblastic proliferation
  • stomach

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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  • Cite this

    Kojimahara, K., Mukai, M., Yamazaki, K., Yamada, T., Katayama, T., Nakada, K., Uematsu, S., Umezono, A., & Hosoda, Y. (1993). Inflammatory pseudotumor of the stomach: Report of a highly infiltrative case with electron microscopic and immunohistochemical studies. Pathology international, 43(1-2), 65-70. https://doi.org/10.1111/j.1440-1827.1993.tb02916.x