The term pulmonary inflammatory myofibroblastic tumor(IMT) has been adopted by theWorldHealth Organization torefer to a variety of pulmonary diseases previously namedinflammatory pseudotumor, plasma cell granuloma,fibroxanthoma, fibrous histiocytoma, pseudosarcomatousmyofibroblastic tumor, and invasive fibrous tumor of the tracheobronchialtree.1 Originally,IMT was regarded as a benigntumor, because its histological features included spindle cellproliferation, accompanied by prominent inflammatory cellinfiltration.2 Furthermore, this tumor had a response to nonsteroidalanti-inflammatory agent treatment. However, evidencehas suggested that IMT was a tumor of intermediatemalignant potential, including adjacent tissue invasion,metastasis,3 and genetic abnormalities.4 Therefore, it isimportant to differentiate IMT from pulmonary inflammatorypseudotumor or sarcoma for the development of therapeuticprotocol. To gain further knowledge about IMT, wewill discuss two cases with unusual characteristics.
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