脑灰质异位症的磁共振成像分析──附9例报告

Analysis of magnetic resonance image for heterotopia of cerebral gray matter-report of 9 cases

［目的］分析脑灰质异位症的磁共振成像表现特点及诊断作用．［方法］分析９例脑灰质异位症 病人，用 ０．２Ｔ磁共振成像机进行各个断面 Ｔ１，Ｔ２ ＷＩ及强化 Ｔ１ ＷＩ扫描 ３例同时做 ＣＴ平扫及强化． ［结果］ ９例 １２个病灶均在大脑半球内．在各个序列上病灶的信号与脑灰质信号一样，病灶与侧脑室关 系密切，病灶的大小和形状各种各样．异位的灰质可以压迫脑室形成压迹，但一般无明显的占位效应．脑 灰质异位常伴有其它颅脑畸形．［结论］磁共振成像为检查脑灰质异位症的最敏感及有效的检查方法， 其信号特点在各个序列上与脑灰质信号相同且无增强效应． ［

OBJECTIVE To analyze manifestation characteristics and diagnostic function of magnetic resonance image (MRI ) for the heterotopias of gray matter. METHODS 9 cases of heterotopia of cerebral gray matter were examined by the 0. 2 Tesla magnetic resonance scanner at every orientation. The location, sizes and shapes of these lesions were various. They had a signal intensity that was isointense compared with that of gray matter on T1 and T2 weighted images. 3/9 cases also were examined with the contrast enhancement and the other 3/9 cases with the CT plain scan and contrast enhancement. RESULTS 12 lesions in the 9 cases all were located in cerebral hemisphere, had isointense as like as that of gray matter on each sequence and had close relationship with lateral ventricles. The sizes and shapes of these lesions were various. There was no evident mass effect although 3 cases oppressed lateral ventricles. There had a frequent combination of heterotopias with the other cerebral malformations. CONCLUSION The magnetic resonance image is the most sensitive and optimum method for detecting the heterotopias of gray matter, and the isointense signal of the lesions is as like as that of gray matter on each sequence and has no contrast enhancement.