评价螺旋CT双期增强扫描诊断肾血管平滑肌脂肪瘤

目的　讨论螺旋 CT双期增强扫描诊断肾血管平滑肌脂肪瘤的价值。方法　 8例受检者全部经平扫及双期增强扫描 ,采用 80 m L 对比剂 2 .5 m L/ s单相注射 ,延迟 2 5 s肾皮质期扫描 ,6 5 s肾实质期扫描。观察其病灶组织成分、特征、发生部位及双期强化峰值。结果　螺旋 CT双期增强扫描显示肾血管平滑肌脂肪瘤起源于肾实质 6例 ,肾窦 1例 ,肾包膜下及肾周连接组织 1例 ,伴结节硬化 2例 ,两侧多发 4例 ,单侧单发 4例。双期增强未强化多脂肪成分 5例 ,少脂肪成分 2例 ,无脂肪成分 1例 ,而肿块内软组织成分明显强化 ,二者分界清晰。其中术前误诊为肾癌 1例。结论　双期增强扫描对其具有显著的诊断价值 ,特别是对少脂肪的病例采用薄层加重建更有利于病变显示

Evaluation of dual-phase contrast-enhanced spiral CT in the diagnosis of angioleiomyolipoma

Objective To study dual phase contrast enhanced spiral CT in the diagnosis of angioleiomyolipoma.Methods Biphasic contrast enhanced spiral CT was performed in 8 patients with angioleiomyolipoma,including 2 males and 6 females with average age of 49.80 mL iodine contrast agent was injected at 2.5 mL/s,the scan delay time of arterial and portal phases was 25s and 65s,respectively.Results All 8 were detected,6 located at renal medulla,1 renal sinus and 1 renal peripheral tissue,2 of which also had nodular sclerosis.Four of 8 were found to have more than 1 lesions on both kidneys whereas the others had only 1 lesion on either kidney.It also showed that 4 have a lot of fatty tissue in its lesions,3 little and 1 no,but all lesions have a clear boundary with their peripheral tissue.Two of them were misdiagnosed as renal carcinoma before operation.Conclusion Dual phase contrast enhanced spiral CT has considerable value in the detection of angioleiomyolipoma,especially for those with less fatty tissue.