Background：The difference between renal oncocytomas （RO） and renal clear cell carcinomas （RCCs） presents the greatest diagnostic challenge.The aim of this study was to retrospectively determine ifRO and RCCs coul...Background：The difference between renal oncocytomas （RO） and renal clear cell carcinomas （RCCs） presents the greatest diagnostic challenge.The aim of this study was to retrospectively determine ifRO and RCCs could be differentiated on computed tomography （CT） images on the basis of their enhancement patterns with a new enhancement correcting method.Methods：Forty-six patients with a solitary renal mass who underwent total or partial nephrectomy were included in this study.Fourteen of those were RO and 32 were RCCs.All patients were examined with contrast-enhanced CT.The pattern and degree of enhancement were evaluated.We selected the area that demonstrated the greatest degree of enhancement of the renal lesion in the corticomedullary nephrographic and excretory phase images.Regions of interest （ROI） were also placed in adjacent normal renal cortex for normalization.We used the values of the normal renal cortex that were measured at the same time as divisors.The ratios of lesion-to-renal cortex enhancement were calculated for all three phases.The Student＆#39;s t-test and Pearson＆#39;s Chi-square test were used for statistical analyses.Results：All RCCs masses showed contrast that appeared to be better enhanced than RO on all contrast-enhanced phases of CT imaging,but there was no significant difference in absolute attenuation values between these two diseases （P 〉 0.05）.The ratio of lesion-to-cortex attenuation in the corticomedullary phase showed significantly different values between RO and RCCs.The degree of contrast enhancement in RCCs was equal to or greater than that of the normal renal cortex,but it was less than that of the normal cortex in RO in the corticomedullary phase.The ratio of lesion-to-cortex attenuation in the corticomedullary phase was higher than the cut off value of 1.0 in most RCCs （84%,27/32） and lower than 1.0 in most RO （93%,13/14） （P 〈 0.05）.In the nephrographic phase,the ratio of lesion-to-cortex attenuation was higher than that in the cortico展开更多
目的探讨多层螺旋CT诊断气管憩室的价值。材料与方法收集胸部CT检查发现的气管旁气囊影(paratracheal air cysts,PAC)50例,观察PAC位置、形态、大小及其与气管间关系。比较PAC与气管间通关系常规横断位与MPR及VR显示差异,采用χ2检验进...目的探讨多层螺旋CT诊断气管憩室的价值。材料与方法收集胸部CT检查发现的气管旁气囊影(paratracheal air cysts,PAC)50例,观察PAC位置、形态、大小及其与气管间关系。比较PAC与气管间通关系常规横断位与MPR及VR显示差异,采用χ2检验进行统计学分析。结果 50例PAC均在气管右侧,位于T1-3胸腔入口平面;形态以类圆、椭圆及肾形为主,单房37例,多房13例;水平直径:0.4-2.41cm,纵向直径:1.15～4.47cm;PAC与气管间连通关系大致分三类:"窗"型相通、含气细管相连及潜在细管相连;常规横断位明确显示连通关系21例(42%),MPR及VR显示37例(74%)(χ2=12.55,p<0.05)。CTVE显示局部气管内表面凹陷(17处)及小孔(18处)。结论 MSCTMPR及VR显示大多数PAC与气管间的空间连接关系,对诊断气管憩室具有重要意义,但有一定限度。展开更多
文摘Background：The difference between renal oncocytomas （RO） and renal clear cell carcinomas （RCCs） presents the greatest diagnostic challenge.The aim of this study was to retrospectively determine ifRO and RCCs could be differentiated on computed tomography （CT） images on the basis of their enhancement patterns with a new enhancement correcting method.Methods：Forty-six patients with a solitary renal mass who underwent total or partial nephrectomy were included in this study.Fourteen of those were RO and 32 were RCCs.All patients were examined with contrast-enhanced CT.The pattern and degree of enhancement were evaluated.We selected the area that demonstrated the greatest degree of enhancement of the renal lesion in the corticomedullary nephrographic and excretory phase images.Regions of interest （ROI） were also placed in adjacent normal renal cortex for normalization.We used the values of the normal renal cortex that were measured at the same time as divisors.The ratios of lesion-to-renal cortex enhancement were calculated for all three phases.The Student＆#39;s t-test and Pearson＆#39;s Chi-square test were used for statistical analyses.Results：All RCCs masses showed contrast that appeared to be better enhanced than RO on all contrast-enhanced phases of CT imaging,but there was no significant difference in absolute attenuation values between these two diseases （P 〉 0.05）.The ratio of lesion-to-cortex attenuation in the corticomedullary phase showed significantly different values between RO and RCCs.The degree of contrast enhancement in RCCs was equal to or greater than that of the normal renal cortex,but it was less than that of the normal cortex in RO in the corticomedullary phase.The ratio of lesion-to-cortex attenuation in the corticomedullary phase was higher than the cut off value of 1.0 in most RCCs （84%,27/32） and lower than 1.0 in most RO （93%,13/14） （P 〈 0.05）.In the nephrographic phase,the ratio of lesion-to-cortex attenuation was higher than that in the cortico
文摘目的探讨多层螺旋CT诊断气管憩室的价值。材料与方法收集胸部CT检查发现的气管旁气囊影(paratracheal air cysts,PAC)50例,观察PAC位置、形态、大小及其与气管间关系。比较PAC与气管间通关系常规横断位与MPR及VR显示差异,采用χ2检验进行统计学分析。结果 50例PAC均在气管右侧,位于T1-3胸腔入口平面;形态以类圆、椭圆及肾形为主,单房37例,多房13例;水平直径:0.4-2.41cm,纵向直径:1.15～4.47cm;PAC与气管间连通关系大致分三类:"窗"型相通、含气细管相连及潜在细管相连;常规横断位明确显示连通关系21例(42%),MPR及VR显示37例(74%)(χ2=12.55,p<0.05)。CTVE显示局部气管内表面凹陷(17处)及小孔(18处)。结论 MSCTMPR及VR显示大多数PAC与气管间的空间连接关系,对诊断气管憩室具有重要意义,但有一定限度。
