颞骨内淋巴囊瘤的影像学诊断及鉴别诊断

目的:探讨颞骨内淋巴囊瘤的HRCT、MRI影像学特点并进行鉴别诊断分析。方法:回顾性分析4例误诊的颞骨内淋巴囊瘤的临床症状、病理组成、HRCT及MRI表现。结果:术后病理证实4例颞骨内淋巴囊瘤均是以内淋巴囊所处的正常解剖位置为中心、血供丰富、侵蚀邻近骨质的乳头状腺瘤。4例HRCT显示肿瘤内部钙化骨针,边缘可见薄层不规则环形钙化影。2例为T1WI不均匀高低混杂信号,T2WI呈高信号为主的混杂信号,1例在T1WI增强扫描后不均质明显强化。并能够将其与其他桥小脑三角的肿瘤鉴别开来。结论:颞骨内淋巴囊瘤是表现为恶性生长方式的良性肿瘤,其影像学表现有共同特点,能够在术前对颞骨内淋巴囊瘤作出诊断。

Edolymphatic sac tumor in temporal bone and its differential diagnosis

bjective： To investigate the imaging feature of endolymphatie sac tumors on HRCT,MR and analyze its differential diagnosis. Methods： Four misdiagnosed endolymphatic sac tumors were analyzed retrospectively by clinical symptoms, pathological constituents and manifestations of HRCT,MRI. Results： All the 4 cases endolymphatic sac tumors originating from the ana tomicai structure of endolymphatic sac, which were hypervascular, bulged destructive disease eroding surrounding bone structure, were papillary adenoma,and were testified pathologically after operations. Intratumoral hyperdensity bone spicules and peripheral calcifications were showed on HRCT of 4 cases. Heterogeneous signal intensity were seen on T1 WI,and heterogeneous signal dominated as hypersignal on T2WI in 2 cases. Increased heterogeneous signal intensity on enhanced T1WI in 1 case. Endolymphatic sac tumor could be differentiated from other tumors located in cerebellopontine angle. Conclusion： Endolymphatic sac tumors are benign neoplasm with malignant growth characters. According to its common imaging features, it can be diagnosed before operation.