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目的：研究脑转移瘤的ＣＴ诊断特征及规律。方法：本组１２０例，男８０例，女４０例。８１例行ＣＴ平扫及增强扫描，３９例直接增强扫描。结果：幕上脑转移瘤８８例，小脑３１例，脑干１例。形态表现多样。多发脑转移瘤６９例，单发５１例，瘤周水肿大多明显，Ⅱ～Ⅲ度水肿占５２．７％；脑转移瘤多明显强化，囊变坏死区不强化。结论：１．脑转移瘤幕上多见，大多位于灰白质交界区；２．多发脑转移瘤具有“多形性”ＣＴ表现特征。３．多为结节状稍高密度影，伴有坏死囊变区，瘤实质部分多明显强化。４．瘤周水肿显著，且具有肿瘤与水肿程度不成比例的特性。
Objective: To study the characteristics and regularity of CT diagnosis of brain metastases. Methods: This group of 120 cases, 80 males and 40 females. 81 cases underwent CT plain scan and enhanced scan, 39 cases of direct enhanced scan. Results: 88 cases of supratentorial brain metastases, 31 cases of cerebellum and 1 case of brain stem. Various forms of performance. Multiple brain metastases in 69 cases, 51 cases of single, mostly peritumoral edema, Ⅱ ~ Ⅲ degree of edema accounted for 52.7%; brain metastases were significantly enhanced cystic necrosis area is not enhanced. Conclusion: 1. Brain metastases more common on the curtain, mostly in the gray-bordered junction; 2. Multiple brain metastases with “pleomorphic” CT features. 3. Mostly a slightly higher density of nodular shadow, with necrosis of the cystic area, tumor parenchyma and more significantly enhanced. 4. Peritumor edema is significant, and has a disproportionate nature of the tumor and edema.