Objective To observe the imaging findings of congenital megaureter in order to enhance the understanding of this disease. Methods Image data of 5 patients with congenital megaureter and 2 misdiagnosed patients were an...Objective To observe the imaging findings of congenital megaureter in order to enhance the understanding of this disease. Methods Image data of 5 patients with congenital megaureter and 2 misdiagnosed patients were analyzed, and image findings of congenital megaureter were summarized. Elscint Prestig 2.0T superconductive magnetic resonance urography (MRU) with conventional sequence (spin-echo, T1WI 560 ms/16 ms; fast spin-echo, T2WI 9600 ms/96 ms) was performed. Raw data were acquired with fast spin-echo sequence from heavy T2-weighted image (9600 ms/120 ms). Post-processing method of MRU was the maximum intensity projection with three-dimensional reconstruction in the workstation. Intravenous pyelography (IVP) was conducted, in which X-ray films were taken 7 minutes, 15 minutes, and 30 minutes after injecting contrast agent, except that in 2 patients the films were taken delayed at 60 and 90 minutes. X-ray retrograde pyelography was performed on 2 patients, successful in one but failed in the other. Results The dilated ureter showed hypointensity on T1-weighted images and hyperinten-sity on T2-weighted images in conventional MRI. The mass wall was intact, uniform in thickness, and showing hypointensity on T1-weighted and T2-weighted images. The MRU images showed a retroperitoneal mass appearing as an elongated tubular cystic structure spreading from kidney to bladder. MRU also revealed dilated calices and renal pelvis, pelviureteric obstruction, and renal duplication. The main signs of congenital megaureter in X-urography was significant dilatation of ureter, or normal renal pelvis with ureter dilatation, hydronephrosis, deformity, and displacement. Conclusions MRU with X-urography could visualize the characteristics of congenital megaureter, including the dilation of renal pelvis and ureter, calculi, urinary tract duplication, and stenosis location. The two techniques can complement each other in disease diagnosis and pro-vide more detailed information for preoperative treatment.展开更多
文摘目的比较3.0 T MRI 3种扫描序列对颈神经根成像的应用价值。材料与方法收集临床需要扫描颈椎MRI患者37例,均行常规序列、三维双回波稳态(three-dimensional double-echo steady state,3D-DESS)序列、多回波数据图像重合(multi-echo data image combination,MEDIC)序列、可变反转角三维快速自旋回波(3D sampling perfection with application optimized contrasts using different flip angle evolutions,3D-SPACE)序列扫描,所有图像均进行后处理重建,对图像质量和正常颈神经根显示、受压颈神经显示清晰度、颈神经根与邻近组织的对比噪声比(contrast noise ratio,CNR)3个方面进行评价。结果 3种扫描序列3个方面两两比较,3D-DESS序列神经根-椎体CNR和神经根-脑脊液CNR均高于MEDIC序列;3D-DESS序列神经根-椎体CNR高于3D-SPACE序列,而3D-DESS序列神经根-脑脊液CNR低于3D-SPACE序列;3D-SPACE序列神经根-脑脊液CNR高于MEDIC序列,3D-SPACE序列神经根-椎体CNR与MEDIC序列差异无统计学意义。图像质量评分3种序列两两对比差异均有统计学意义(P<0.05),3D-DESS序列优于MEDIC序列,而3D-SPACE序列图像质量最差。对受压神经根清晰度的显示,3D-DESS序列和MEDIC序列差异无统计学意义,两序列与3D-SPACE序列对比,差异均有统计学意义(P<0.05),即两序列均优于3D-SPACE序列。结论对于显示神经根结构和诊断神经根病变等方面,3D-DESS序列明显优于MEDIC序列和3D-SPACE序列,对颈神经根成像及颈神经根受压的临床诊断更具优势。
文摘Objective To observe the imaging findings of congenital megaureter in order to enhance the understanding of this disease. Methods Image data of 5 patients with congenital megaureter and 2 misdiagnosed patients were analyzed, and image findings of congenital megaureter were summarized. Elscint Prestig 2.0T superconductive magnetic resonance urography (MRU) with conventional sequence (spin-echo, T1WI 560 ms/16 ms; fast spin-echo, T2WI 9600 ms/96 ms) was performed. Raw data were acquired with fast spin-echo sequence from heavy T2-weighted image (9600 ms/120 ms). Post-processing method of MRU was the maximum intensity projection with three-dimensional reconstruction in the workstation. Intravenous pyelography (IVP) was conducted, in which X-ray films were taken 7 minutes, 15 minutes, and 30 minutes after injecting contrast agent, except that in 2 patients the films were taken delayed at 60 and 90 minutes. X-ray retrograde pyelography was performed on 2 patients, successful in one but failed in the other. Results The dilated ureter showed hypointensity on T1-weighted images and hyperinten-sity on T2-weighted images in conventional MRI. The mass wall was intact, uniform in thickness, and showing hypointensity on T1-weighted and T2-weighted images. The MRU images showed a retroperitoneal mass appearing as an elongated tubular cystic structure spreading from kidney to bladder. MRU also revealed dilated calices and renal pelvis, pelviureteric obstruction, and renal duplication. The main signs of congenital megaureter in X-urography was significant dilatation of ureter, or normal renal pelvis with ureter dilatation, hydronephrosis, deformity, and displacement. Conclusions MRU with X-urography could visualize the characteristics of congenital megaureter, including the dilation of renal pelvis and ureter, calculi, urinary tract duplication, and stenosis location. The two techniques can complement each other in disease diagnosis and pro-vide more detailed information for preoperative treatment.
