颞骨骨巨细胞瘤的C T、MR I表现

目的：探讨颞骨骨巨细胞瘤(GCTTB)的CT、MRI影像学表现。方法回顾性分析经病理证实的5例 GCTTB 的影像学资料,分析其病灶的位置、大小、形态、边缘、密度、信号及强化等影像表现,并结合文献探寻其特征性影像表现。结果5例中病灶均位于颞骨的颞颌关节窝附近,病灶呈类圆形,膨胀性溶骨性骨破坏为主,脑侧部分较皮侧大,病灶破坏区内有线样高密度分隔,破坏区边缘颅骨无硬化边,病灶内有斑点状、条样及大片状高密度钙化灶,病变边缘有不连续骨包壳,有“交界角”征,病变周围无软组织肿块,MRI因病灶内成分不同而信号差异明显,增强扫描病灶内实性成分明显强化。结论颞骨骨巨细胞瘤发病率低,明显膨胀生长、有不连续骨包壳、病灶内分隔以及钙化灶多见、有“交界角”征等征象具有相对特征性。

CT and MRI findings of giant cell tumors of the temporal bone

Objective To investigate CT and MRI findings of giant cell tumors of the temporal bone(GCTTB).Methods CT and MRI features of 5 cases pathologically proven GCTTB were retrospectively reviewed.The lesion characteristics,including location, size,shape,margin,attenuation on CT scans,signal intensity on MR images,and enhancement pattern were documented and analyzed.Results In all 5 patients,the lesions were located adj acent to the mandibular fossa.These lesions were round or oval in shape,predominantly demonstrated as expansive lytic bone destruction containing hyperattenuating septa,calcifications,non-sclerotic borders,and discontinuous bony shells,with“boundary angle”sign.No soft tissue masses were found around the lesions.These lesions with different content demonstrated various MRI signal intensity,and the solid component enhanced intensely.Conclusion GCTTB is rare.Features such as expansive growing pattern,discontinuous bony shell,intralesional septa,calcification,and “boundary angle”sign are common,which may help in the radiographic diagnosis of giant cell tumor.