Retroperitoneal actinomycosis masquerading as inflammatory pseudotumor Academic Article uri icon

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  • Inflammatory pseudotumors present clinically as mass lesions and microscopically show a spectrum of nonspecific inflammatory and regenerative changes. When the mesentery or retroperitoneum are involved, differentiation from inflammatory fibrosarcoma poses a diagnostic problem. The authors report on a 7-year-old boy who presented with fever, anemia, weight loss, and a retroperitoneal mass. Needle biopsy results of the mass showed features consistent with inflammatory pseudotumor. Examination of the resected mass showed actinomycosis.


  • Radhi, Jasim
  • Hadjis, Nicholas
  • Anderson, Lucyna
  • Burbridge, Brent
  • Ali, Kaiser

publication date

  • April 1997