论文部分内容阅读
目的探讨胰腺实性假乳头状瘤(SPN)的多层螺旋CT特征性表现,提高其术前诊断准确率。方法回顾性分析2007年1月至2012年1月经术后病理证实的8例SPN的术前螺旋CT平扫和多期动态增强扫描的CT征象。结果 8例病灶均为单发;7例为类圆形,1例呈分叶状;位于胰腺头颈部3例,胰体尾部5例;均表现为胰腺囊、实性肿块;3例肿块内见钙化;增强后肿瘤实性部分及包膜呈渐进性、中度强化,囊变、坏死部分不强化;8例患者胰管均未扩张。实性部分CT平扫呈稍低或等密度,三期增强扫描所有病灶实性部分动脉期呈周边轻中度强化,门脉期和延迟期呈渐进性强化略高于动脉期,但强化程度均略低于正常胰腺组织,囊性部分平扫及增强均呈低密度。结论 SPN的多层螺旋CT检查具有一定的影像学特点,即瘤体多为单发,位置以胰腺组织的尾部多见,瘤体内组织以囊性与实质性按一定比例相混合的形态为主,CT密度值不均,瘤体界限清楚,胰腺管一般不扩张等,这些特点可作为术前对于SPN诊断的参考。
Objective To investigate the characteristic manifestations of multi-slice spiral CT of solid pseudopapillary tumor (SPN) in pancreas and to improve the accuracy of preoperative diagnosis. Methods CT findings of preoperative spiral CT and multi-phase dynamic enhanced CT in 8 cases of SPN confirmed by postoperative pathology from January 2007 to January 2012 were analyzed retrospectively. Results 8 cases were single lesions, 7 cases were round, 1 cases were lobulated, located in the pancreas head and neck in 3 cases, 5 cases of pancreatic body tail, showed pancreatic capsule, solid mass, 3 cases of mass Internal calcification; enhanced solid part of the tumor and the envelope was progressive, moderate enhancement, cystic degeneration, necrosis part is not enhanced; 8 cases of pancreatic duct did not expand. Real part of the CT scan showed a slightly lower or equal density, solidified part of the three enhanced scan of the solid part of the peripheral arterial phase was mild to moderate enhancement, portal phase and delayed phase was slightly higher than the arterial phase enhancement, but the degree of enhancement Slightly lower than normal pancreatic tissue, the cystic part of the plain and enhanced showed low density. Conclusions Multi-slice spiral CT examination of SPN has some imaging features, ie, the tumor is mostly single, the location is more common in the tail of pancreas, and the main part of the tumor is mainly the mixture of cystic and substantive proportion , Non-uniform CT density, clear tumor boundaries, pancreatic duct generally do not dilate, these characteristics can be used as a preoperative diagnosis of SPN reference.