颈动脉体瘤的多排螺旋CT诊断

目的:探讨多排螺旋CT及CTA诊断颈动脉体瘤的价值.方法:回顾性分析11例经病理证实的颈动脉体瘤多层螺旋CT平扫及增强扫描和CTA的影像资料,结合多平面重建(MPR)、最大密度投影(MIP)、容积再现(VR)等图像后处理技术分析其影像学特征.结果:11例共12个肿块,平扫肿块密度与肌肉相类似,CT值35～48 HU,其中5例内见小灶状液化坏死区,动脉期图像显示所有病变明显强化,CT值高达200 HU以上,延迟扫描病变密度明显降低,其中3个病灶强化均匀,6个病灶强化不均匀.12例均位于颈动脉分叉水平.8例颈部CTA均可清晰显示肿块与颈总、颈内及颈外动脉的关系,并可见肿块侧的颈动脉分叉呈杯口状扩大.结论:多层螺旋CT颈部平扫和增强以及CTA可以替代DSA作为确诊颈动脉体瘤的最佳诊断方法.

Diagnostic value of multislice spiral CT for carotid body tumor

Objective： To assess the diagnostic value of MSCT and MSCTA for carotid body tumor. Methods： The MSCT imaging data were retrospectively analyzed in 11 cases with carotid body tumor proved pathologically. Three imaging postprocessing methods,such as multiplanar reformation （MPR）,maximum intensity projection （MIP） and volume render- ing （VR） ,were performed for each CT and CTA study,and then the recon images of them were analyzed and compared. Re- suits：There were 12 masses found in 11 cases including one case involved the bilateral carotid artery. The density of the masses was similar to that of muscle on non--contrast CT,with CT value of 29~48HU. CT found small focal liquefactive necrosis in 5 cases. All lesions were markedly enhanced with CT value over 200HU on arterial-phase CT images, and the density of lesions decreased rapidly on delayed-phase images. Three lesions showed homogeneous enhancement, six lesions showed heterogeneous enhancement. All of 12 lesions were located at the level of bifurcation of common carotid artery. The CTA displayed clearly the relationship between the masses and common carotid artery,the internal and external carotid ar- teries in 8 cases. The bifurcation angle of common carotid artery was enlarged by the mass. Conclusion： MSCT scanning in- eluding enhanced CT and CTA may work as the best method instead of DSA for diagnosing carotid body tumor.