简介：背景与目的：中枢神经细胞瘤的MRI诊断常用T1WI及T2WI，而DWI应用较少。本文探讨中枢神经细胞瘤的MRI和DWI表现及鉴别诊断。方法：回顾性分析本院经手术及病理检查证实的8例中枢神经细胞瘤的MRI及DWI表现。结果：7例MRI呈明显蜂窝状样改变，其中4例与侧脑室或胼胝体壁间见“丝条状”牵拉影．肿瘤实质在RWI呈等信号或稍高信号，增强扫描呈明显强化。1例肿瘤呈实体性。7例行DWI检查，其实质均呈稍高信号或高信号，ADC值为（0．830±t0）x10-3mm2／s，5例瘤内见血管影；4例同侧脑室明显扩大，3例双侧脑室扩大；MRI和DWI对中枢神经细胞瘤的诊断结果基本相同，MRI对肿瘤形态、肿瘤周围结构的显示较DWI清楚，但DWI在一定程度上反映了该肿瘤的组织学特征，对肿瘤的诊断更灵敏、更准确。结论：MRI和DWI对中枢神经细胞瘤的诊断及鉴别诊断具有重要价值．

简介：Objective:Toassessifdiffusion-weightedmagneticresonance(MR)imagingwithoutapparentdiffusioncoefficient(ADC)valuesprovidesaddeddiagnosticvalueincombinationwithconventionalMRimaginginthedetectionandcharacterizationofsmallnodulesincirrhoticliver.Methods:Twoobserversretrospectivelyandindependentlyanalyzed86nodules(≤3cm)certifiedpathologicallyin33patientswithlivercirrhosis,including48hepatocellularcarcinoma(HCC)nodules,13high-gradedysplasticnodules(HDN),10low-gradedysplasticnodules(LDNs)and15otherbenignnodules.AllthesefocalnoduleswereevaluatedwithconventionalMRimages(T1-weighted,T2-weightedanddynamicgadolinium-enhancedimages)andbreath-holddiffusion-weightedimages(DWI)(b=500s/mm2).Thenoduleswereclassifiedbyusingascaleof1-3(1,notseen;3,wellseen)onDWIforqualitativeassessment.Thesesmallnoduleswerecharacterizedbytworadiologists.ADCvaluesweren’tmeasured.ThediagnosticperformanceofthecombinedDWI-conventionalimagesandtheconventionalimagesalonewasevaluatedusingreceiveroperatingcharacteristic(ROC)curves.Theareaunderthecurves(Az),sensitivityandspecificityvaluesforcharacterizingdifferentsmallnoduleswerealsocalculated.Results:Among48HCCnodules,33(68.8%)weregradedas3(wellseen),6(12.5%)weregradedas2(partiallyobscured),and9weren’tseenonDWI.Among13HDNs,therewere3(23.1%)and4(30.8%)gradedas3and2respectively.Five(50%)of10benignnoduleswerepartiallyobscuredandslightlyhyperintense.For86nodules,theaveragediagnosticaccuracyofcombinedDWI-conventionalimageswas82.56%,whichwasincreasedsignificantlycomparedwithconventionalMRimageswith76.17%.ForHCCandHDN,thediagnosticaccuracyofcombinedDWI-conventionalimagesincreasedfrom78.69%to86.07%.Conclusions:Diffusion-weightedMRimagingdoesprovideaddeddiagnosticvalueinthedetectionandcharacterizationofHDNandHCC,anditmaynotbehelpfulforLDNandregenerativenodule(RN)incirrhot

简介：本组收集2002年9月～2011年2月苏州大学附属第一医院收治的8例CNC中，男性4例、女性4例，年龄22～55岁，中位年龄31-3岁。6例患者因头痛、呕吐及视物模糊等颅高压症状入院。