脑转移瘤的CT分析

目的 探讨脑转移瘤的CT影像特点，以提高其诊断准确率。方法 利用84例已确诊原发灶的颅内转移瘤资料，进行回顾性分析。结果 84例中，有70例是肺癌脑转移，占83．3％，这点有助于帮助诊断。典型的CT表现有：(1)环状强化或环状和结节状混合强化为绝大多数；(2)周围大范围水肿，与病灶大小不成比例；(3)颅内多发为常见。而非典型的CT表现主要有多灶内出血和少数无水肿的病灶或单发结节灶。结论 脑转移瘤绝大多数有典型CT表现，但也要与脑脓肿和胶质瘤相鉴别。

Analysis of CT imaging of brain metastasis

Objective To explore the characteristics of CT imaging of brain metastasis (BM) for the purpose of raising CT diagnostic accuracy of it. Methods In retrospect, we studied brain CT imaging of 84 patients with BM whose protopathy had been confirmed. Results In all the 84 cases, 70 had BM protopathy from lung cancer, accounting for 83.3 %. Typical CT imaging of BM was characterized with: (1) annular enhancement or annular and tubercular combined enhancement; (2) huge size of hydrops surrounding the metastasis, not proportional to the size of metastasis; (3) multi brain metastasis with great frequency. Atypical CT imaging of BM primarily presented hemorrhage inside metastasis, a few metastasis without hydrops or single tubercular metastasis. Conclusion Most BMs manifest with typical CT imaging, but should be differentiated from brain abscess and brain glioma at clinical diagnosis.