目的 探讨原发性脑淋巴瘤的MRI表现及病理基础，提高对脑原发性淋巴瘤的认识。 方法 回顾分析2010年1月－2012年5月28例确诊为脑原发性淋巴瘤的MRI影像特征及临床病理资料。 结果 28例患者，共发现36个病灶，幕上病灶34个，幕下病灶2个；MRI平扫；32个病灶在T1WI、T2WI肿瘤实质表现为等信号；4个病灶内出现液化坏死（其中1个病灶呈明显囊变），信号不均。MRI增强扫描：35个肿瘤病灶实质部分均匀强化，1个病灶呈环形强化。病理类型均为弥漫性大B细胞非霍奇金淋巴瘤。 结论 原发性脑淋巴瘤具有较典型的MRI影像特征，可在术前明确诊断。
摘要:目的: 探讨臂丛神经磁共振成像的技术方法及其可行性。 方法 :对15例正常志愿者行双侧臂丛神经成像:包括常规快速自旋回波序列T1加权(T1W/TSE)、快速自旋回波序列T2加权(T2W/TSE)、快速自旋回波序列T2加权加SPIR脂肪抑制(T2W/SPIR)冠状位扫描以及弥散加权背景抑制成像序列(DWIBS)轴位扫描。 结果 :T1W/TSE、T2W/TSE、及T2W/SPIR对臂丛节后神经同层显示率分别为533%、567%和833%;DWIBS MIP重建图像对臂丛神经的全貌显示较为完整、清晰、直观;T1W/TSE、T2W/TSE、T2W/SPIR及DWIBS MIP重建图像的对比噪声比分别为109±09、107±13、185±68和299±133,T2W/SPIR序列和DWIBS MIP重建图像的对比噪声比明显高于T1W/TSE和T2W/TSE序列。 结论 :T2W/SPIR序列对臂丛神经的同层显示率及图像的对比噪声比明显高于常规T1W/TSE、T2W/TSE序列, DWIBS MIP重建图像能够显示臂丛神经的全貌,两者为臂丛神经成像较为有效的技术方法,对于臂丛神经病变的诊断即具有十分重要的意义。Abstract: Objective: To determine the optimal sequences of brachial plexus with MRI. Methods : Fifteen volunteers were underwent MRI on 15T scanner, the Sequences of T1W/TSE/COR, T2W/TSE/COR, T2W/SPIR/COR and Diffusionweighted imaging with background body signal suppression were performed. Results : The display rates of brachial plexus postganglionic segment nerve showing at the same slice were 533%, 567% and 833% on T1W/TSE/COR, T2W/TSE/COR, T2W/SPIR/COR. Brachial plexus on DWIBS MIP were clear and complete. Contrastnoise ratio of four sequences was 109±09, 107±13, 185±68 and 299±133,respectively. Contrastnoise ratio of T2W/SPIR/COR and DWIBS MIP was significantly higher than that of the other two sequences. Conclusion : Display rate of brachial plexus and contrastnoise ratio of images on T2W/SPIR/COR were higher than those of routine sequences. Image of DWIBS MIP can show the outline of brachial plexus clearly. The two sequences were reliable and effetive techoniquic in diagnosis of brachial plexus lesion.
目的:运用磁共振成像评价鼻咽癌海绵窦侵犯的影像学表现和侵犯途径。方法:回顾性分析经病理证实的140例鼻咽癌海绵窦侵犯病例的MRI图像及临床资料,观察海绵窦受侵的MRI表现和侵犯途径。结果:140例患者,受累海绵窦156侧,单途径侵犯共107侧,双途径侵犯共39侧,3条途径侵犯共8侧,4条途径侵犯共2侧。51侧(32.69％)为卵圆孔单途径受侵, 42侧(26.92％)破裂孔单途径受侵,多途径侵犯中卵圆孔、破裂孔作为共同途径共26侧(16.67％)。结论:MRI能较好的评价鼻咽癌海绵窦侵犯情况及其侵犯途径,卵圆孔侵犯是最常见的单一侵犯途径,其次为破裂孔;卵圆孔、破裂孔作为共同途径在多途径侵犯中最常见;经翼腭窝、圆孔途径侵犯海绵窦并不少见。
Objective To explore the clinical features of spontaneous spinal epidural hematoma (SSEH) and to find out factors influencing its prognosis. Methods From September 1998 to October 2006, 23 patients with SSEH (10 males and 13 females) were treated. Their ages ranged from 10 to 69 years. The primary neurological status were classified as grade A in 7 patients,B in 2 patients, C in 4 patients, D in 9 patients and E in 1 patients accordingto ASIA grading system. The progressive intervals of their symptoms were divided as four period: less than 12 hours (12 patients), 12 to 24 hours(2 patients), 24 to 48 hours(3 patients) and more than 48 hours(6 patients). SSEH was diagnosedby MRI or by histopathological examination. The cases history, laboratory examination, radiological image, treatment, pathological result and prognosis were recorded and analyzed after 3 month. Results In 23 patients, there were 1 case of deterioration, 8 cases of no change, 9cases of improvement and 5 cases of complete recovery. The gender had no correlationwith prognosis(P＞0.05). In the patients who had shorter progressive interval and more severe edema of spinal cord, the prognosis was worse(P＜0.05). Inthe patients who had mild neurological deficit, the prognosis was good (P＜0.01). In 17 patients undergoing surgery, the scores for prognosis was 1 point in 1 case, 2 points in 5 cases, 3 points in 6 cases and 4 points in 5 cases; the operation time had no correlation with prognosis(r=0.056, P＞0.05). In6patients undergoing conservative treatment, the scores for prognosis were 2 points and 3 points in 3 cases respectively. Conclusion Prognosis of patient with SSEH is influenced by his primary neurological status, progressive interval, spinal edema and size of hematoma. The major treatment is surgical evacuation of hematoma as early as possible to break the aggravation of spinal function. Conservative treatment is not considered unless the neurological defects recovered in the early period.
【摘要】 目的 探讨粟粒性脑结核及与其需要鉴别疾病的MRI特点。 方法 2007年12月-2009年10月，对11例粟粒性脑结核患者的MRI平扫及增强表现进行分析，总结其MRI特征性表现。 结果 病史上粟粒性脑结核多存在血行播散型肺结核，平扫表现为多发小片影，增强后表现为弥漫分布的小环状或结节状强化灶，大小趋向一致，多为2 mm左右，可合并结核性脑膜炎及脑积水。 结论 粟粒性脑结核的MRI平扫表现不典型，增强表现有一定特征性，认识其特点可以和其它常见的颅内多发病变进行鉴别。【Abstract】 Objective To analyze the MRI appearances of cerebral military tuberculosis and other diseases that need to differentiate. Methods From December 2007 to October 2009, the MRI appearances of 11 cases on the plain scan and the enhanced MRI scan after injection of Gd-DTPA were reviewed and summarized. Results The cases of cerebral military tuberculosis usually had the history of military pulmonary tuberculosis, showed multiple lesions in fragments on plain scan, and the lesions distributed diffusely after enhancement, showed as ring form or nodosity. The size tended to be uniform, often 2 mm in diameter approximately. Tuberculosis meningitis and hydrocephalus could accompany. Conclusion The manifestation of plain MRI is not typical, and the enhancement MRI is imperative. Some characteristic appearances can be found after injection of Gd-DTPA, and these characteristic appearances could be helpful to differentiate with other multiple intracranial diseases.
Objective To understand and analyze technique development of magnetic resonance elastography (MRE) and its application in chronic liver disease. Method The relevant literatures about the application of MRE in the field of chronic liver disease were reviewed. Results The liver fibrosis was a common pathway of chronic liver disease, which would progress to cirrhosis of the liver if untreated. The diagnosis and assessment of fibrosis was important in the treatment of patients with chronic liver disease. The liver biopsy was considered to be the reference standard for clinical assessment of liver fibrosis. However, this technique was invasive and still had inevitable drawbacks in the clinical practice. With the update of the imaging technology and equipment, the MRE had been developed as a safe and noninvasive examination method for the evaluation of liver fibrosis in the chronic liver disease, early diagnosis of nonalcoholic fatty liver disease, evaluation of focal liver lesions, and other clinical applications. Conclusion MRE is currently regarded as an attractive noninvasive technique in management of chronic liver disease.
Objective To investigate the situation and prospect of local recurrence of rectal cancer by using CT and MRI. Method Relevant references about the imaging diagnosis of local recurrence of rectal cancer， which were published domestic and abroad in recent years， were collected and reviewed. Results In the diagnosis of local recurrence of rectal cancer， the sensitivity of CT was higher than that of MRI， while the specificity and accuracy were not. Perfusion CT， dynamic contrast-enhanced MRI， and diffusion weighted imaging were valuable in diagnosing local recurrence of rectal cancer， as new diagnostic techniques. Conclusion Both CT and MRI are important and valuable methods in diagnosing for local recurrence of rectal cancer.
ObjectiveTo study the value of magnetic resonance multiple sequence examination in the diagnosis of biliary sludges. MethodsThe display rates of biliary sludges were obtained from 56 cases of biliary sludges between February 2011 and March 2013 examined with trans T1 weighted imaging (T1WI), T2 weighted imaging with fat suppression (T2WI-FS), true fast imaging with steady-state precession (True FISP), and MR cholangiopancreatography (MRCP) proved by operations or endoscopic retrograde cholangio-pancreatography. Then we carried out a statistical comparison study. ResultsThe display rate combined with trans T1WI, T2WI-FS, True FISP, and MRCP sequence was statistically higher than any other single sequence (P<0.005). Diagnostic sensitivity, specificity and accuracy of MRI for biliary sludges were 85.7%, 84.1% and 84.5%, respectively. ConclusionTo improve the display rate of biliary sludges on MRI, multiple sequences including trans T1WI, T2WI-FS, True FISP, and MRCP should be used.