Inflammatory pseudotumor




According to the WHO classification, three lesional patterns can be observed




  • Inflammatory myofibroblastic tumour, that can be associated with a ALK gene rearrangement

  • Plasmocytic pattern ("plasma cell granuloma"), that can be linked to IgG4-related disease

  • Fibrous and hyalinizing pattern: Pulmonary hyalinizing granuloma



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