Inflammatory Pseudotumor

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

  • Inflammatory myofibroblastic tumour, that can be associated with an ALK gene rearrangement
  • Plasmocytic pattern ("plasma cell granuloma"), that can be linked to IgG4-related disease
  • Fibrous and hyalinizing pattern: Pulmonary hyalinizing granuloma