Fibroma Of Tendon Sheath And Giant Cell Tumor Of Tendon Sheath:Comparison Of MR Imaging Feature And Differential Diagnosis

Purpose:To study MRI features of fibroma of tendon sheath(FTS)and giant cell tumor of tendon sheath(GCTTS),so as to improve the diagnosis and differential of two lesions.Materials and methods:17 patients with FTS and 27 patients with GCTTS confirmed by operation and pathology were retrospectively analyzed.All patients were examined with MRI.The location,size,shape and the relationship with the surrounding tissue,the signal featureand enhancing pattern of the two groups were compared.Imaging features in the two groups were assessed and analyzed by using independent samples t test and chi-square test.Results:FTS were nodular or mass-like(n=11).Few lesions appeared adjacent bone absorption(n=2).On T2WI,the lesions showed peripheral low signal ring(n=6)orinternal mixed low-signal intensity of was striped or filamentous configurations(n=10).The volume of low-signal intensity accounted for more than 2/3 of the total lesion’s volume(n=6).Enhanced T1WI,tumors revealed ring enhancement(n=6).GCTTS appeared mostly lobulated(n=16),common with adjacent bone compressive absorption(n=9).On T2WIs,most of lesion had a peripheral low signal ring(n=22).Tumors revealed mixed high signals intensity with granular or patchy irregular low signal intensity scattered in the mass(n=17),the area of low signal accounts for less than 1/3 of total neoplastic volume(n=18).On contrast T1WIs,GCTTS appeared heterogenous enhancement.Statistical analysis showed that the shape of the lesion,the presence or absence of compressive bone absorption,the presence of a low signal ring around the lesion,the shape of the low-signal in T2WIs and the proportion,and the presence of circumferential enhancement,there were statistically significant differences between the two(P<0.05).And there was no statistically significant difference in the age,gender and location of disease(P>0.05).Conclusions:FTS and GCTTS have a different characteristic of MRI features.FTS appears anodular or mass-like tumor with mixed low signal on T2WIs.The low-signal shows striped or filamentous shapes,accounting for more than 1/3 of total lesion’s volume.On enhanced T1WI,tumor shows ring enhancement.GCTTS usually appear a lobulated tumor.Most of lesion has low signal ring,typically with adjacent bone compress compressive absorption.On T2WIs,tumor reveals mixed high signals intensity with granular or patchy irregular low signal intensity scattered in the mass.The area of lowsignal accounts for less than 1/3 of total neoplastic volume.