Multifocal intrathoracic inflammatory myofibroblastic tumour in children.

Pulmonary inflammatory myofibroblastic tumour is the most common benign pulmonary tumour in childhood; however it is seldom diagnosed radiologically. We report three cases of biopsy-proven inflammatory myofibroblastic tumour that presented as large aggressive intrathoracic masses mimicking a malignant process. Two cases also had multifocal areas of origin. The possibility of inflammatory myofibroblastic tumour should be considered in a child presenting with a large aggressive pleuropulmonary mass lesion even with multifocal origin.