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American Journal of Neuroradiology 24:2092-2096, November-December 2003
© 2003 American Society of Neuroradiology

Case Report
HEAD AND NECK

Inflammatory Myofibroblastic Tumor of the Temporal Bone

Roberto Gasparottia, Diego Zanettib, Andrea Bolzonib, Paola Gambab, Maria L. Morassic and Marco Ungaric

a Department of Radiology, University of Brescia, Brescia, Italy
b Section of Neuroradiology, the Department of Otolaryngology, University of Brescia, Brescia, Italy
c Department of Pathology, University of Brescia, Brescia, Italy

Address reprint requests to Roberto Gasparotti, MD, Neuroradiologia, Università di Brescia, Policlinico Satellite, Piazzale Spedali Civili 1-25100 Brescia, Italy

Summary: Inflammatory myofibroblastic tumors include a diverse group of lesions characterized by inflammatory cell infiltration and variable fibrotic responses. Occurrence in the temporal bone is unusual. We present CT and MR imaging findings of an inflammatory myofibroblastic tumor of the temporal bone in a 26-year-old patient with repeated paroxystic episodes of rotatory vertigo that occurred over a few days. CT and MR imaging revealed a homogeneously enhancing soft-tissue mass of the right mastoid with bone erosion of the tegmen and extensive dural thickening. The mass resembled a malignant tumor, and the patient underwent an extended mastoidectomy through a retroauricular approach. Microscopic examination showed myofibroblastic spindle cells with mixed inflammatory infiltrate, and the pathologic diagnosis was inflammatory myofibroblastic tumor.




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