骨软骨瘤的3.0T MRI特征

3.0 T MRI Features of Osteochondroma

目的探讨骨软骨瘤(osteochondroma)的MRI特征。资料与方法回顾性分析经病理证实的16例骨软骨瘤患者的MRI平扫及增强扫描资料,并侧重分析其软骨帽的MRI特征。结果(1)16例骨软骨瘤中,13例有明显软骨帽,软骨帽在T1WI均呈略低信号(与肌肉相比);在T2WI有11例呈明亮高信号,2例呈稍高信号;Gd-DT-PA增强扫描11例呈中等强化,2例轻度强化;(2)13例软骨帽内4例可见明显钙化,T1WI、T2WI均呈低信号。5例儿童和青少年患者的软骨帽厚度为0.8～1.8cm,8例成人患者中,7例软骨帽厚度为0.3～1.1cm,1例软骨帽厚度达3.9cm,均未见恶变;(3)16例中,带蒂型10例,广基型6例(包括鞍底1例、椎板1例);3例软骨帽边缘有软组织肿块。结论软骨帽呈T1WI略低信号,T2WI高信号,Gd-DTPA增强扫描中等强化是典型软骨瘤的MRI特征性表现。

Objective To improve diagnostic accuracy of osteochondroma by studying the MRI features. Materials and Methods Sixteen patients with histologically proved osteochondroma were investigated by MRI （T1-,T2-weighted sequences,intravenous gadolinium application）. MRI features of the hyaline cartilage cap were emphatically analyzed. Results （1）13（13/16） cases had hyaline cartilage cap which were a little hypointensity on T1WI（compared with skeletal muscle）,meanwhile hyperintensity on T2WI（11 heavy and 2 slight）. Moderate （11 cases） toslight （1 case） contrast were showen on T1WI when Gd DTPA injected. （2） Four showed calcifications：curvilinear,punctuate,mixed curvilinear and punctuate patterns,and showed hypointensity on both T1-and T2-weighted MR imaging. The hyaline cartilage caps of 5 cases in children and adolescence ranged from 0.8 to 1.8 cm in thickness,meanwhile the caps of 7 cases in adult ranged from 0.3 to 1.1 cm and 1 case 3.9 cm. Malignant transformation was not seen in all 13 cases. （3） Among the sixteen cases 10 were the pedicled and 6 were the sessile,in which one case located in sellar floor and the other one in vertebral plate. Soft-tissue mass could be seen in 3 cases. Conclusion For the typical cases,MRI has characteristic features.For those located in sellar floor or protruded into the vertebral canal,the accuracy of diagnosis still depends on pathology.