脑转移瘤的CT诊断(附100例分析)

CT diagnosis of brain metastases:A report of 100cases

脑转移瘤是常见的颅内肿瘤,约占颅内肿瘤的15～25%。CT 扫描(尤其是增强扫描)在脑转移瘤的诊断中起着无可非议的作用。检出转移瘤可为临床提供诊断和治疗依据,改变治疗方案,尤其是原发灶不明的病例。脑转移瘤同其他颅内肿瘤的鉴别有时很困难。本文分析了100例脑转移瘤的 CT 表现,目的在于提高诊断和鉴别诊断水平。

The CT findings in 100 cases of brain metastases were analysed,and they were classified into four types:nodular,ring-shaped,irregular and mixed basing on contrast enhancement CT scaning. The CT features are as follows:1.Hypodensity in most cases,hyperdensity and equal-density in a small number of cases;2.More nodular and mixed types than others types no obvious;di- fferance in CT findings between brain metastases and various types of lung carcinoma and other primary carcinomas;3.There was relatively extensive edema not in proportion to the size of the lesions;4.The rather large single metastasis was usually not easily differentiated from glioma; 5.Most lesions located near cerebral cortex but lesions from breast carcinoma usually in cerebellar hemisphere. The contrast enhancement CT scan may,therefore,be considered to be very important for the judgement of brain metastasis.Differential diagnosis of brain metastasis is finally disscussed.