MR Imaging Findings of Malignant Fibrous Histiocytoma of Bone

Purpose: The purpose of this study is to assess magnetic resonance (MR) imaging findings of malignant fibrous histiocytoma (MFH) of bone and to evaluatethe role ofcontrast-enhanced MR imaging in thediagnosis of bone MFH. Materialsand Methods: MR imagingsof pathologicallyproven bone MFH inten patients were reviewed. Enhanced study was also performed with Gd-DTPA. The MR images were evaluated for signal intensity, homogeneity, marginal definition, presence of internal septation, cortical destruction, soft tissue extension, joint involvement and contrast enhancement. Results: Tumors showed isoor slightly high signal intensity to muscle on T1-weighted images and heterogeneously high signal intensity on T2-weighted images. Four cases showed poor-marginated border on T2-weighted images and four cases had internal septa. Eight of nine patients with intravenous administration of Gd-DTPA showed contrast enhancement, five were heterogeneous and three were homogeneous. AII cases showed cortical destruction and soft tissue extension. Five cases showed joint involvement. Conclusion: Bone MFH showed similar MR imaging findings ofsofttissue MFH or other malignant bone tumors, butjoint involvement was suggestive finding of bone MFH.