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1、低颅压综合症Intracranialhypotension病史：Thepatientisa22-year-oldwomancomplainingofaheadachethatisexacerbatedwhilestandingandwhilecoughing,butrelievedintherecumbentpositionsincethebirthofherfirstchild1monthago.Thedeliverywasuncomplicatedexceptfordifficultyestablis
2、hingepiduralanesthesia.影像改变：Thereisdiffuselinearenhancementofthepachymeningesinvolvingboththesupratentorialandinfratentorialcompartments(arrowsinFigure1andFigure2).硬脑膜可见弥漫性线样强化,累及幕上及幕下ThesagittalT1-weightedimagedemonstrateslow-lyingcerebellartonsils(yello
3、warrowFigure3),aslightlyelongatedfourthventricle,andslighteffacementoftheprepontinecistern.SlightAPelongationofthemesencephalonisdemonstratedontheaxialT2-weightedimage(yellowarrowinFigure4).矢状位Ti显示扁桃体低位,四脑室轻度狭长,桥前池轻微狭窄,轴位T2显示中脑向前后方向轻度延伸.诊断：Intracranialhyp
4、otension低颅压综合症要点：·Meningealenhancementshouldbecategorizedaspachymeningealorleptomeningealtoaidintheformulationofadifferentialdiagnosis.脑膜强化应该被分为硬脑膜或软脑膜强化,以帮助鉴别诊断·Thetypicalimagingfindingsofintracranialhypotensionare:saggingofposteriorfossastructuresanddif
5、fusepachymeningealenhancement.颅内低压综合征的典型影像表现为:后颅窝结构下垂和弥漫性硬脑膜强化.讨论：Intracranialhypotension(ICH)isararecauseoforthostaticheadachethatworsensintheuprightposition.ICHisthoughttoresultfromapersistentCSFleak,usuallyafterduralcompromisefollowingadiagnosticlumbar
6、puncture,spinalanesthesia,ormyelography.Otheretiologiesincludepriorcraniotomy,craniectomy,spinalsurgery,ortrauma.ICHmayalsooccurspontaneouslysecondarytoruptureofaTarlovcyst,dehydration,hyperpnea,uremia,ordiabeticcoma.低颅压综合症（ICH）是体位性头痛的一种少见病因，在直立位的时候更明显，IC
7、H被被认为是脑脊液持续性渗漏的结果，通常发生在诊断性腰穿、脊椎麻醉或脊髓造影术后。其他的病因包括既往的开颅术后、颅骨切除术、脊椎外科手术或创伤。ICH也可以继发于Tarloy囊肿破裂、脱水、深快呼吸、尿毒症或糖尿病昏迷Imagingcharacteristiccanbesubtleandnonspecificintheabsenceofanappropriatehistory.Theimagingfindingsarecharacterizedbysaggingoftheposteriorfossawit
8、hlow-lyingcerebellartonsils(whichmaybemistakenforaChiariImalformation),elongationofthefourthventricle,andeffacementoftheprepontinecistern.Additionally,diffusesmoothlinearpachymeningealenhancementispresentinvolvingbo
