中枢
男性、75岁，头痛
答案1—8：BABBAAAB
Findingsanddiagnosis
Findings
MRIdemonstratesanextra-axialcysticstructureintheanteriorlefttemporallobe.ThereisnoassociatedabnormalFLAIRsignalorenhancement.(MR示左颞角囊性占位；FLAIR信号无异常，无强化)
Differentialdiagnosis
Arachnoidcyst蛛网膜囊肿
Epidermoidcyst表皮样囊肿
EnlargedCSFspace(i.e.,megacisternamagna)脑脊液空间扩大/大枕大池
Subduralhygroma硬膜下积液
Dilatedperivascularspace扩张血管周围间隙
Cysticneoplasms/low-gradegliomas囊性肿瘤/低级别胶质瘤
Dysembryoplasticneuroepithelialtumor胚胎发育不良性神经上皮肿瘤
Pilocyticastrocytoma毛细胞型星形细胞瘤
Pleomorphicxanthoastrocytoma多形性黄色星形细胞瘤
Multinodularandvacuolatingneuronaltumor多结节和空泡神经肿瘤
Cysticperiventricularleukomalacia囊变的脑室周围白质软化
Diagnosis
Arachnoidcyst
Keypoints
Clinicalpresentation/pathophysiology
Arachnoidcystsarethoughttobediverticulaemanatingfromseptationsofarachnoidmembranes,connectedtothesubarachnoidspaceandfilledwithCSFfluid.
Theyarebenign,usuallydevelopmentalanomalies(somehavinggeneticassociations),buttheycanalsoariseasaresultofpriortrauma,infection,orhemorrhage.
Theyarereportedtobefoundinapproximately1.4%ofindividuals(Al-Holouetal,).
Arachnoidcystscanoccuranywhereinthesubarachnoidspace,includingwithinthespinalcanal.
Occasionally,theycanenlargeandcausemasseffectonnearbystructuresleadingtoneurologicalsymptomssuchasheadacheandcranialnervedysfunction,includinghearingloss.Theycanalsoleadtonon北京中科助力白癜风康复盖百霖价格大概是多少
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