Objective To study CT and MRI findings of malignant fibroushistocytoma(MFH) of the soft-tissue.Methods 27 cases of MFH of the soft-tissue proved pathologically were presented.There were 16 cases of male and 11 cases female,with a mean age of 40.0 years.CT scans were obtained in 12 cases,in which four cases were done by contrast enhancement study.MR images were studied in 18 cases,in which two cases were enhanced by Gd-DAPA injection.Results MFH was distributed in the lower extremities in 15/27 cases.The average maximum diameter of the tumor was 8.4 cm.The tumor shape was irrgeular or multilobulated in 26 cases.The tumor was hypodensity in 10/12 cases on CT scan,hypointensity in 16/18 cases and isointensity in two cases on T1 WI MRI.Calcification was demonstrated in 7 cases,hemorrhage in 5 cases,necrosis and cystic change in 24 cases.Bony involvement was showed in 7 cases.A hypervascular mass was determined on enhancement CT and MRI or DSA studies.Conclusion It should be suspected MFH if a tumor is seen in the lower extremity of a 40 years old patient with a invasive pattern on CT or MRI study.
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