CT和MRI在诊断鼻内型脑膜脑膨出中的作用

目的：评价CT和MRI在诊断鼻内型脑膜脑膨出中的价值。方法：回顾性分析7例经手术和病理证实鼻内型脑膜脑膨出患者的CT与MRI表现；4例均行CT和MRI扫描,2例仅行CT扫描，1例仅行MRI检查。结果：7例鼻内型脑膜脑膨出患者中有1例并发脑积水。冠状位CT扫描可见筛骨骨质缺损，MRI见鼻腔内囊状异常脑脊液信号，并向上与颅内蛛网膜下腔直接相通，其内有少量脑组织信号。结论：CT和MRI能正确诊断该型脑膜或脑膜脑膨出；CT显示颅底骨质缺损大小、部位优于MRI，MRI可清楚显示疝出物及其与脑底的关系。

Evaluation of CT and MRI in diagnosis of intranasal encephalomeningocele

Objective: To evaluate the values of CT and MRI in diagnosing intranansl encephalomeningocele.Method: The CT and MRI features of 7 cases confirmed by operation and pathology were retrospectively analyzed.Result: CT and MRI demonstrated that all cases were encephalomeningocele and 1 case was accompanied with hydrocephalus. MRI demonstrated that the herniation in nasal cavity were glial tissue and meninges,the signals are abnormal cerebrospinal fluid signal and it was attached to intracranial subarachnoid cavity.Conclusion: CT and MRI could diagnose encephalomeningocele correctly. CT could clearly manifest the size and location of the defect of cranial base bone, and the location of hernia. MRI was more advantageous than CT in displaying the contents in hernia, and the relationship between hernia and cranial base. Coronal and axial imaging planes with MR T 1- and T 2-weighted sequences are required to demonstrate intracerebral connection.