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[肝脏血管平滑肌脂肪瘤的CT\MRI诊断价值] 肝脏血管平滑肌脂肪瘤CT表现

发布时间:2019-03-14 06:27:07 浏览数:

  [摘要] 目的 探讨肝脏血管平滑肌脂肪瘤(hepatic angiomyolipoma, HAML)的CT、MRI特征及其诊断价值。方法 回顾性分析7例经手术或穿刺活检证实的HAML的CT、MRI表现。4例经CT检查,3例经MRI检查。结果 CT平扫4例5个病灶均为不均匀低密度,其中3个可测及脂肪密度,1个可见低密度囊变区及高密度出血区。增强后动脉期5个病灶均显著不均匀强化,门脉期及延迟期3个病灶持续强化。3个病灶可见中心血管影。2例合并肾血管平滑肌脂肪瘤。MR T1WI上2个病灶为不均匀低信号,1个为均匀低信号。T2WI上3个病灶均为高信号,其中2个信号不均匀,1个信号均匀。增强后动脉期3个病灶均显著强化,其中2个不均匀强化,1个均匀强化。门脉期及延迟期3个病灶均持续强化,其中2个不均匀强化,1个均匀强化。2个病灶可见中心血管影。结论 综合病灶中的脂肪成分以及动脉期显著不均匀强化、门脉期或延迟期持续强化、中心血管影等动态强化特征,大部分的HAML在术前都可以作出明确诊断,对部分少脂肪或/和缺乏典型强化特征的HAML要注意与其它肝脏病变相鉴别。
  [关键词] 血管平滑肌脂肪瘤; 肝脏; 体层摄影术; X线计算机; 磁共振成像
  [中图分类号] R812[文献标识码] B[文章编号] 1005-0515(2011)-07-317-02
  The Diagnostic Value of CT and MRI Appearances of Hepatic Angiomyolipomas
  [Abstract] Objective To study the features and diagnostic value of CT、MRI of hepatic angiomyolipoma(HAML). Methods retrospective to analyze 7 cases were proved by surgical or needling biopsy.4 cases were preformed CT scanning and others were preformed MRI scanning. Results 5 lesions in the 4 cases appeared as hypodense on plain CT scans, 3 lesions contained component of fat, 1 lesions present hypsodense hemorrhage zone and hypodense cyst zone. On The arterial phase scans, all lesions appeared as hypodensity. On the portal venous phase, 3 lesions remained enhanced and the central vascular structure could also be seen. 2 cases affiliate HAML.2 lesions showed inhomogeneous hypodensity and 1 lesions showed homogeneous hypodensity on SE T1WI. 3 lesions showed hyperintensity on SE T2WI, 2 of them are inhomogeneous and the other one is homogeneous. 3 lesions showed marked enhancement on the MR arterial phase scans, 2 of them are inhomogeneous and the other one is homogeneous. 3 lesions prolonged enhanced on the portal venous phase, 2 of them are inhomogeneous and the other one is homogeneous. The central vascular structure could be seen in 2 lesions. Conclusions Combine the features of lesions that contained fat, significant inhomogeneous enhancement on the arterial phase, persistence or gradually enhancement on portal venous phase and the central vascular structure, most HAML can be diagnosed identify, the HAML of deficiency fat or marked enhancement features must be identified to other liver pathological changes.
  [Keywords] Angiomyolipomas; Liver; Tomography; X-ray computed; Magnetic resonance imaging
  HAML是肝脏少见的良性间叶性肿瘤,术前容易被误诊为肝癌、血管瘤、FNH、肝脏肉瘤等。为进一步提高对本病的认识及诊断准确率,作者搜集经手术或穿刺活检证实的7例HAML,分析其CT、MRI表现,认为大部分HAML具有一定的特征性,现报告如下。
  1 材料与方法
  1.1 一般资料 本组7例,经手术病理证实6例,B超导引下穿刺活检证实1例,其中男1例,女6例,年龄31~73岁,平均49岁。体检时偶然发现5例。因上腹部不适,行B超检查发现2例,其中1例合并慢性肝炎,乙肝表面抗原(+)。所有病例甲胎蛋白及癌胚抗原均阴性,无口服避孕药和结节硬化史。
  1.2 CT检查方法 使用Siemens Somaton Volume Access螺旋CT机,140KV,200mA,准直5~8mm,进床速度5~8mm/s,重建层厚5mm。全肝平扫后行增强扫描,增强对比剂为碘海醇100ml(300mg I/ml),注射速率3.0ml/s,用高压注射器经肘静脉注入后25~30s行动脉期扫描,70s时行门脉期扫描,2例加做了3min的延迟扫描。
  1.3 MRI检查方法 使用Philips Intera Achieva 1.5T超导型磁共振成像系统,快速SE序列,横断位T2WI、T1WI,T2WI及T1WI-SPAIR(脂肪抑制),增强后行T1WI或T1WI脂肪抑制横断位扫描。扫描参数:T2WI TR/TE=332.5ms/60.0ms,T1WI TR/TE=10.0ms/4.6ms,T2WI-SPAIR 425.3ms/80.0ms,T1WI-SPAIR 257.8ms/5.1ms。扫描层厚6mm。FOV 375×375。矩阵288×229。3例均行平扫后多期增强扫描(包括动脉期、门脉期及延迟期),造影剂Gd-DTPA,剂量15ml。
  2 结果
  2.1 CT表现 经CT检查4例,共发现5个病灶,位于肝脏右叶3个,左叶2个。2例合并肾血管平滑肌脂肪瘤。CT平扫5个病灶均为不均匀低密度,其中3个可测及脂肪密度,CT值

推荐访问:脂肪瘤 平滑肌 肝脏 血管

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