肾癌磁共振信号强度及其与病理变化的关系

MR signal intensity and pathologic correlation of renal cell carcinoma

本文观察到18例肾癌的磁共振图像在T_1加权图像上可表现出高强度、等强度、低强度和混合信号强度,在重T_2加权像时以高强度信号较多,少数为混合或低强度信号。观察了8例肾癌的病理切片,讨论了几种与肾癌MR信号有关的因素,12例肾癌的T_2值为141.02±8.88ms,肾癌与腰大肌T_2值的比值为2.49±0.24,同对照组肾皮质及肾髓质与腰大肌T_2值比值有明显差异。简要地评价了肾癌T_2值及与腰大肌T_2值比值的意义。

18cases of renal cell carcinoma ( RCC ) MRI were studied. The tumor showed a wide spectrum of MR intensity, ranging from hypointense to hyperintense, and in some cases, heterogeneous intensity was demonstrated, on the T1 weighted images, while on the heavy T2 weighted images, most cases were hyperintense, with only a few appearing inhomogeneous and hypointense. Postoperative gross and microscopic pathologic examination of the kidney specimens were undertaken in 8 cases, pathologic correlation demontstrated that hemorrhage, necsosis, liquefaction and amount of adipose content, as well as histologic patterns of the tumors, were the possible factors influencing the MR signal intensity. The mean values of T2 relaxation time and Tj ( RCC )/T2 ( psoas muscle ) , in 12 cases of RCC were 141.02 ± 8.88 ms and 2.46 ± 0.26 ms respectively, showing significant differences as compared with that of the cortex or medulla of the kidney in the control group. The significance of these parameters was evaluated.