低颅压综合征的MRI诊断

目的 分析低颅压综合征的MRI表现,以提高对本病的认识. 资料与方法 搜集经临床证实的低颅压综合征10例,治疗前均行MRI检查,其中3例仅行平扫,7例同时平扫和增强,3例加MRA,1例加MRV. 结果 10例均有硬脑膜增厚、静脉窦和脑静脉扩张;6例可见脑下垂和脑室缩小表现;4例可见侧枝静脉窦显影(基底丛和岩下窦);5例可见垂体增大;4例出现硬膜下积液;增强7例均见硬脑膜均匀性增厚强化,软脑膜无强化,2例见脊膜强化. 结论 低颅压综合征具有特征性的MRI表现,结合脑脊液压力检测,可以明确诊断.     

自发性低颅压综合征的MRI诊断

目的:探讨自发性低颅压综合征的MRI表现特征.材料和方法:回顾性分析11例自发性低颅压综合征的CT、MRI表现特点.11例均为女性.1例仅行MRI平扫,10例行MRI平扫及增强扫描,其中1例同时行CT平扫.结果:CT表现正常1例.MRI显示额、颞、顶、枕部对称性硬脑膜均匀性增厚9例,伴明显增强11例,合并硬膜下积液6例,硬膜下亚急性期积血3例,"脑下垂"3例.结论:广泛而对称的硬脑膜均匀性增厚、增强是自发性低颅压综合征的特征性影像学表现,MRI有助于诊断自发性低颅压综合征.     

自发性低颅压的MRI诊断价值

目的 探讨自发性低颅压的MRI表现特征及其诊断价值.方法 回顾性分析经腰穿测压证实的10例自发性低颅压患者的临床和MRI表现. 结果本组10例自发性低颅压患者中8例有特征性的体位性头痛.MRI表现包括弥漫性硬脑膜强化9例;脑下垂6例次;硬膜下积液5例次;垂体增大5例次;硬膜下出血3例次.结论 自发性低颅压的MRI表现具有特征性,尤其是增强后硬脑膜弥漫强化征象对本病的诊断很有价值.     

低颅压综合征的MRI典型征象探讨

目的:探讨低颅压综合征的MRI典型征象。方法:分析4例经临床治疗证实的低颅压综合征患者的临床与MRI检查资料。结果:4例均可见硬脑膜增厚强化、脑室及桥前池变小、硬膜下积液(其中2例硬膜下积液中蛋白含量增高,2例继发硬膜下血肿)、幕上脑实质内陷;3例见脑下垂及小脑扁桃体下移。结论:低颅压综合征患者的头颅MRI表现具有典型征象,分析这些征象有助于MRI对低颅压综合征的正确诊断。     

低颅压综合征的MRI诊断

目的：分析低颅压综合征的影像表现,以提高对本病的认识。方法：回顾性分析10例低颅压综合征的影像表现,2例行头颅CT平扫、头颅MRI平扫、增强扫描及脊柱增强扫描,4例行头颅MRI平扫,4例行头颅MRI平扫及增强扫描。结果：2例头颅CT平扫显示脑室缩小。10例头颅MRI扫描均匀硬脑膜增厚,4例出现脑室缩小和脑下垂,4例出现垂体增大,5例出现硬膜下积液,6例增强扫描均显示硬脑膜弥漫性增厚并明显强化。1例脊柱MRI扫描显示硬脊膜弥漫增厚并明显强化。结论：低颅压综合征具有特征性的MRI表现,结合临床表现及脑脊液压力测定,可以明确诊断。     

自发性低颅压综合征的影像学表现

目的:探讨自发性低颅压的影像学表现,以提高对该病的认识.材料和方法:回顾性分析13例自发性低颅压影像学表现.结果:13例头颅CT表现:11例正常,1例硬膜下血肿,1例双侧硬膜下少量积液.6例行头颅MRI均显示弥漫性脑膜增厚,脑膜增强.结论:影像学特别是MRI表现具有一定的特征性,有助于帮助诊断自发性低颅压.     

原发性低颅压综合征的MRI表现

目的 探讨原发性低颅压综合征(SIH)的MRI表现.资料与方法 回顾分析8例经临床证实的SIH患者的临床和MRI资料.结果 头颅MRI示硬膜下积液、硬脑膜增厚8例,静脉窦和脑静脉扩张7例,脑下垂2例,垂体增大1例.增强扫描6例均见硬膜均匀性增厚强化.2例脊髓MRI示蛛网膜下腔均匀变窄,硬脊膜外积液.腰穿结果提示8例患者脑脊液压力均<60 mm H2O.结论 MRI能显示SIH的特征性表现,有助于临床诊断.     

低颅压综合征的MRI表现(附5例报告)

目的 探讨低颅压综合征的MRI表现.资料与方法 回顾性分析5例低颅压综合征的影像学表现,其中1例行头颅CT平扫、头颅和脊柱MRI平扫及增强扫描、头颅MRV扫描,3例行头颅MRI平扫及增强扫描,1例行脊柱MRI平扫及增强扫描.结果 1例头颅CT扫描未见异常.4例头颅MRI扫描均显示硬脑膜弥漫性增厚并明显强化,1例出现脑下垂.1例头颅MRV显示上矢状窦、直窦、横窦扩张.2例脊柱MRI扫描显示硬脊膜广泛增厚并明显强化.结论 硬脑(脊)膜弥漫性增厚强化是低颅压综合征的特征性影像学表现,MRI增强扫描是诊断低颅压综合征的敏感影像学检查方法.     

自发性低颅压综合征的临床特点和MRI表现

目的:分析自发性低颅压综合征的临床特点和MRI表现.材料和方法:5例SIH患者均行腰穿和MRI检查.结果:5例患者均有特征性体位性头痛症状,腰穿脑脊液压力为98～490Pa(10～50mm H2O),MRI平扫示4例出现脑膜增厚,增强扫描显示双侧额、顶、颞、枕颅板下方及小脑幕脑膜对称性条状增强,1例出现硬膜下出血,2例出现脑下垂,保守治疗后出血吸收,脑下垂表现缓解.结论:综合分析临床表现、腰穿结果和MRI表现可明确诊断.     

低颅压综合征的临床特点与MRI表现

目的:分析14例低颅压综合征的临床特点及其MRI表现。方法:回顾性分析14例低颅压综合征患者的临床及MRI资料。结果:所有患者均有特征性体位性头痛;特征性MRI表现为7(7/8)例显示硬脑膜增厚,8(8/8)例显示窦汇扩张(后下缘后凸呈弧形),7(7/8)例显示双侧硬脑膜弥漫性对称性均匀性强化,10(10/14)例MRM示脊膜憩室、囊肿、脑脊液漏。结论:低颅压综合征的临床特点多样,体位性头痛是其特征性症状;头颅MRI增强扫描具有特征性表现,MRM可较为明确的显示脑脊液漏的部位;MRI检查在低颅压综合征的诊断中具有较大应用价值。     

Neuroimaging features of spontaneous intracranial hypotension

We reviewed the cranial MRI and radionuclide cisternograms of four adults with postural headache indicating spontaneous intracranial hypotension (SIH). All four underwent clinical and radiological follow-up. MRI showed diffuse, thin meningeal enhancement; bilateral subdural fluid collections; and morphological abnormalities secondary to “sagging” of the brain. Radionuclide cisternography revealed direct or indirect signs of leakage of cerebrospinal fluid (CSF) along the spinal axis, and the symptoms resolved after the leak treated by epidural injection of blood at a level indicated by the cisternogram. The diffuse meningeal enhancement decreased but persisted on follow-up MRI, although the patients were asymptomatic. All morphologic abnormalities resolved during 3–5 months follow-up. Received: 24 August 1998 Accepted: 27 April 1999     

大脑脚脚间角对低颅压综合征患者的临床价值

目的:探讨MR I大脑脚脚间角测量在诊断低颅压综合征中的临床价值.方法:搜集经临床诊断的43例低颅压综合征患者及性别、年龄相匹配的43例健康志愿者的临床和MR I资料.对比分析2组患者的主要MR I表现(包括有无硬脑膜增厚及/或强化、脑下垂、静脉窦扩张、硬膜下积液等)及大脑脚脚间角(在经乳头体层面的横轴面T2 WI上由...     

脑内出血性海绵状血管瘤的MRI诊断

目的:分析脑内出血性海绵状血管瘤(IHCA)的MRI表现特点。方法:回顾性分析25例经病理证实的脑IHCA的MRI资料。结果:25例病变均为单发,幕上18例,幕下7例,其中大脑半球11例,基底节及丘脑7例,脑干5例,小脑2例,病变形态以类圆形为主,由于反复多次出血信号不均匀,增强无或轻度强化。结论:脑IHCA的MRI表现有一定特征性,但与其它颅内病变有类似之处,认真分析其特点,可提高诊断准确性。     

Spontaneous intracranial hypotension: the value of brain measurements in diagnosis by MRI

Caudal brain displacement is inconstantly reported as an MRI feature of spontaneous intracranial hypotension (SIH). We reviewed the clinical data and MRI of eight patients diagnosed as having SIH and investigated the possibility of more precise assessment. On midsagittal images we measured four anatomical landmarks: the position of the cerebellar tonsils, fourth ventricle, and infundibular recess, plus the angle between the bicommissural line and a line tangential to the floor of the fourth ventricle; midsagittal images from 89 normal controls were also measured. On statistical analysis, all measurements differed in the two groups, and the difference was significant for the cerebellar tonsils, fourth ventricle, and infundibular recess. Some overlap between patients and controls was found for each measurement; however, all the patients had two (two patients) or more (six) values outside the range in normal controls range or not above their 1st quartile. Measurement of the position of the third ventricle seemed particularly sensitive. We suggest that examination of midsagittal images can help in diagnosing clinically suspected SIH. Received: 17 July 2000 Accepted: 20 November 2000     

Diagnosis and temporal evolution of signs of intracranial hypotension on MRI of the brain

Introduction  A comprehensive evaluation of cranial magnetic resonance imagings (MRIs) of 23 patients with intracranial hypotension (IH) was performed, and the evolution of the abnormalities on follow-up MRIs was correlated with the clinical outcome. Materials and methods  The MRI report database at the University Health Network in Toronto was searched, and 23 cases of IH were identified between 2001 and 2007. A retrospective review of the MRIs of the brain and the electronic patient chart was performed. A control group of 40 subjects was also selected to complement the analysis of the pituitary gland. Results  A positive venous distention sign (VDS) was observed in 23 out of 23 patients and was the first sign to disappear on early follow-up scans following successful treatment. Pachymeningeal enhancement was seen in 23 out of 23 patients, and pachymeningeal thickening was detectable on unenhanced fluid attenuation inversion recovery (FLAIR) sequences in 17 out of 23 patients (74%). An increase in pituitary size in IH was also demonstrated based on the measured pituitary height and was qualitatively detectable in 12 out of 21 (57%) patients as the protrusion of the pituitary gland above the sella turica (two postpartum patients were excluded from this analysis). Overall, there was good correlation between the imaging findings and clinical outcome following treatment. Conclusion  Accurate diagnosis and follow-up of IH should be possible is some patients on unenhanced MRI of the brain by combining the signs on FLAIR and sagittal T1W images, enabling timely diagnosis in unsuspected cases and avoiding unnecessary administration of gadolinium compounds. In addition, VDS might be useful for early assessment of response to treatment.     

MRI对颅内生殖细胞瘤的诊断价值

目的：分析总结颅内生殖细胞瘤的MRI表现特征,提高对其的认识。方法：分析了12例颅内生殖细胞瘤的MRI。结果：肿瘤12例中9例为类圆形;10例边界清楚,没有脂肪信号;9例有大小不等囊变,囊变散在分布;肿瘤实质部分T1WI以低信号为主,T2WI等信号或稍高信号,增强扫描肿瘤实质部分明显强化;大部分肿瘤周围脑组织轻中度水肿;肿瘤的占位效应较轻。结论：MRI对颅内生殖细胞瘤有一定诊断价值。     

中线颅内脂肪瘤的磁共振影像诊断

颅内脂肪瘤ＭＲＩ特征性的信号表现及位置的中线性说明ＭＲＩ对诊断具有重要意义。材料与方法：对１６例ＭＲＩ诊断的颅内脂肪瘤进行回顾性分析总结。全部 病例临床表现无特异性，均用Ｐｈｉｌｉｐｓ０．５Ｔ－Ⅲ型超导磁共振机采用自旋回波序列（ＳＥ）进行扫描，Ｔ：加权像ＴＲ＝５００－５２０／ＴＥ＝２５，Ｔ２加权像ＴＲ＝２２７３／ＴＥ＝９０，距阵２５６×２５６，行同、矢状及冠状位扫描，就其信号表现及颅内益进行分析总