少见部位软骨母细胞瘤的影像学表现

目的:探讨少见部位软骨母细胞瘤(CB)的影像学表现。方法:回顾性分析经病理证实的20例少见部位CB的影像学资料,分析其病灶位置、形态、密度及增强表现等特征。结果:20例中病灶位于距骨6例,跟骨5例,髌骨4例,肩胛骨2例,髂骨2例,坐骨1例。病灶在X线和CT上主要表现为类圆形或不规则形,以膨胀性溶骨性骨破坏为主,周围可见硬化边,其内有或无分隔,边缘可见骨嵴,病灶内偶尔可见点状及片状钙化。病灶在MRI上表现为不均匀的长T1、长T2信号。结论:少见部位软骨母细胞瘤发病率低,影像学表现具有相对特征性和多样性,应结合临床、影像学和病理学特征进行综合诊断,避免误诊。

Radiologic feactures of chondroblastoma in unusual sites

Objective：To investigate radiological features of chondroblastoma in unusual sites. Methods：We retrospectively re viewed the radiological features of 20 cases with pathologically proved chondroblastoma in unusual sites. The location, shape,density and enhancement characteristics of the lesions were assessed. Results：The bones involved were the talus （n= 6） ,the calcaneus （n 5）, the patella （n= 4）, the scapula （n = 2）, the ilium （n=2） and the ischium （n=1）. The characteristic imaging features include round to oval,irregular osteolytic expansive bone destruction with or without septum and slight sclerotic margin on CT and plain ra- diography. Spotty or patchy calcification might occasionally be encountered. Typically, chondroblastoma in unusual sites appeared heterogeneously hypointense on T1 WI and heterogeneously hyperintense on T2WI. Conclusion..Chondroblastoma in unusual sites is rare and has varied appearances. Some specific imaging features of the chondroblastoma in unusual sites still exist. Imaging combined with clinical and pathological manifestations is helpful for most accurate diagnosis of the chondrob｜astoma in unusual sites.