中枢神经系统表皮样囊肿20例CT与MRI诊断

CT and MRI diagnosis for epidermoid cyst of central nervous system: A report of 20 cases

摘要: 目的: 分析颅内及椎管内表皮样囊肿的CT和MRI的表现。方法: 对20例经手术证实的颅内及椎管内各部位表皮样囊肿的CT和MRI的表现作回顾性分析。结果: 本病好发于中线结构及其附近间隙;在CT上表现多为类圆形分叶状囊性低密度肿块,也可呈高密度或混杂密度。在MRI上信号多为长T₁长T₂信号,也有呈短T₁长T₂信号。结论: CT及MRI对无钙化的表皮样囊肿有特征性诊断价值,对有钙化、囊肿内容物溃破侵蚀脑组织的表皮样囊肿诊断尚需仔细斟酌。

Abstract: Objective: To analyze the CT and MRI features of intracranial and intraspinal epidermoid cyst.Methods: The CT and MRI features of 20 patients with intracranial and intraspinal epidermoid cyst confirmed by pathology were analyzed retrospectively.Results: All the intracranial and intraspinal epidermoid cyst were located in the medial areas or near the medial areas.CT scans showed ovoid or lobulated hypodense mass,and some appeared hyperdense or mixed-dense mass.MRI revealed long T₁ and T₂ signals in most cases.Some appeared short T₁ and long T₂ signals.Conclusions: The CT and MRI features have specific diagnostic value in noncalcific epidermoid cyst,but in diagnosis of calcificed cases,they may not be accurate enough.