227例颅内肿瘤的脑电图分析

本文227例经手术和病理证实的颅内肿瘤中,幕上肿瘤脑电图160例,除1例误诊为正常外,余均为不正常脑电图.其中局灶性慢波122例(76.2%),患侧慢波18例(11.2%),即140例(87.4%)有定位定侧诊断意义.19例为弥散性异常,而其中18例为中线深部肿瘤.67例颅后凹肿瘤脑电图,除18例桥小脑角肿瘤中的11例正常外,余56例均为广泛不正常.这说明半球肿瘤脑电图多为局灶性慢波,而弥散性慢波以颅后凹或中线深位肿瘤为主.桥脑小脑角肿瘤脑电图50%以上为正常.

ELECTROENCEPHALOGRAPHIC ANALYSIS OF 227 CASES-OF INTRACRANIAL TUMORS

EEG changes in 227 cases of intracranial tumor confirmed by operations and pathological examinations were analysed. Of them, the EEG of 160 cases of intrinsic supratentorial brain tumors showed all to be abnormalxcept one that was erroneously diagnosed as normal. In these cases there were 122 cases(76.2%) of focal slow waves, 18 cases(11.2%) of focal unilateral slow waves totaling 140 cases(87.4%) which had value of diagnosis. There were 19 cases(11.9%) of diffuse abnormality, and in 18 cases of them, tumors in deep midline were found.The EEG of 56 cases (83.5%) of posterior cranial fossa tumors was diffusely abnormal in 67 cases, except the fact that EEG of 11 cases in 18 cases of pontocerebellar angle tumors was normal. It was determined that the EEG of cerebral hemisphere tumors mostly showed focal slow waves, and the diffuse abnormality was predominant in tumors of the posterior cranial fossa and deep midline. The EEG of pontocerebellar angle tumors was normal in more than 50% cases.