CAJ | 학술논문

目的分析骨外间叶型软骨肉瘤(EMC)的CT、MRI表现特点.方法回顾性分析手术病理证实的8例EMC的影像和病理资料.结果 8例中,下肢4例,前臂1例,躯干2例,右肺1例.CT检查7例,5例瘤体内见弓环状、颗粒状、团块状或不规则条纹状钙化,密集钙化3例,局灶钙化2例.瘤体内未钙化区域的密度低于邻近肌肉组织.MR检查5例,4例周围分布的EMC在T1WI均为等高信号；T2WI均为高低混杂信号,其中2例呈“胡椒面”样表现；1例为高信号包绕低信号.增强后可见弥漫性不均匀强化及钙化区强化.1例中央分布的EMC呈长T1、长T2的分叶状病灶,T2WI上可见低信号间隔,增强后呈结节样强化.结论 EMC的影像表现有一定特征性,结合钙化特点、钙化区强化及信号特征有助于正确诊断.
목적 분석골외간협형연골육류(EMC)적CT、MRI표현특점.방법 회고성분석수술병리증실적8례EMC적영상화병리자료.결과 8례중,하지4례,전비1례,구간2례,우폐1례.CT검사7례,5례류체내견궁배상、과립상、단괴상혹불규칙조문상개화,밀집개화3례,국조개화2례.류체내미개화구역적밀도저우린근기육조직.MR검사5례,4례주위분포적EMC재T1WI균위등고신호；T2WI균위고저혼잡신호,기중2례정“호초면”양표현；1례위고신호포요저신호.증강후가견미만성불균균강화급개화구강화.1례중앙분포적EMC정장T1、장T2적분협상병조,T2WI상가견저신호간격,증강후정결절양강화.결론 EMC적영상표현유일정특정성,결합개화특점、개화구강화급신호특정유조우정학진단.
Objective To explore CT,MRI findings of extraskeletal mesenchymal chondrosarcoma (EMC).Methods Imaging information of all 8 cases of EMC verified by pathology were retrospectively analyzed.Results The location of lesions included lower extremity in 4 cases,forearm in 1 case,trunk in 2 cases and right lung in 1 case.The CT examination was performed in 7 cases,and 5 cases contained different patterns of ring-and-arc,granular,clump or irregular streaky mineralization.Dense calcification was detected in 3 cases,and focal in 2 cases.The nonmineralized component had slightly lower attenuation on CT scans than adjacent muscle.Four cases of peripheral located EMC demonstrated isointense on T1 WI,and mixed signal intensity on T2WI.For the cases of fine and dense calcification in 2 cases,numbers of dot-like low-intensity signals were detected resembling “pepper sign”; while for the cases of focal mineralization in 1 case,the low intensity area was located centrally in the high intensity area.Heterogeneous enhancement was found both in the calcified and uncalcified areas.One case of central located tumor exhibited low and high intensity on T1 and T2 weighted images,and nodual enhancement was observed.Conclusion EMC has several characteristic imaging features,including various mineralization pattern,enhancement of calcified area and signal intensity,which might have diagnostic value for this rare tumor.