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目的：提高脑内转移瘤影像诊断的准确性。材料与方法：脑转移瘤与脑内其他病变术前相互误诊的４２例作回顾性影像分析。结果：脑内转移瘤误诊的主要原因是由于影像的不典型表现（４７．６％），病变部位的影响（１１．９％），特殊因素的影响（１６．７％），如临床病史的误导，少见肿瘤，少见表现。结论：脑内转移瘤与脑内血肿的鉴别诊断应注意血肿周围含铁血黄素沉积圈的完整性和规则性。应用颅外肿瘤的检测，特别是肺部ＣＴ检查，以提高脑内转移瘤的诊断和鉴别诊断的正确性。
Objective: To improve the accuracy of imaging diagnosis of brain metastases. Materials and Methods: A retrospective image analysis was performed on 42 cases of misdiagnosis between brain metastases and other brain lesions. Results: The main causes of misdiagnosis of brain metastases were atypical findings (47.6%), lesions (11.9%) and special factors (16.7%), such as clinical history Misdirect, rare tumor, rare performance. Conclusion: The differential diagnosis between intracerebral metastasis and intracerebral hematoma should pay attention to the integrity and regularity of hemosiderin trapping circle around the hematoma. Application of detection of extracranial tumors, especially lung CT examination to improve the diagnosis of brain metastases and the correctness of the differential diagnosis.