Fibrosing inflammatory pseudotumours are an inflammatory process with histology showing a polymorphous infiltrate with plasma cells, lymphocytes and eosinophils as well as a significant reactive fibrovascular component.
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Pathology
Location
They can occur at various sites of the body including:
- skull base
- nasopharynx - fibrosing inflammatory pseudotumour of nasopharynx
- ear
- parotid glands
- pterygomaxillary space
Radiographic features
MRI
Fibrosing inflammatory pseudotumours may be seen as an infiltrative lesion with bone destruction.
- T2: usually hypointense due to fibrous components
Differential diagnosis
As the name suggests, fibrosing inflammatory pseudotumour can sometimes mimic malignancy.