颅内转移瘤(又称脑转移瘤)系指原发于身体其他部位的肿瘤细胞转入颅内,其发病率占颅内肿瘤的3.5%~10%,小脑转移瘤占颅内肿瘤的10%~15%,大多为多发,单发脑内转移瘤仅占1/4。国内外均认为以肺癌脑转移最多见。其中肺癌脑转移占30%~40%,以肺小细胞癌和腺癌为多。有文章报道,小细胞 Intracranial metastases (also known as brain metastases) refers to the primary tumor in other parts of the body into the brain, the incidence of intracranial tumors accounted for 3.5% to 10% of cerebellar metastases accounted for intracranial tumors 10 % ~ 15%, mostly multiple, single brain metastases accounted for only 1/4. At home and abroad are considered the most common brain metastases of lung cancer. Including lung cancer brain metastases accounted for 30% to 40%, with small cell lung cancer and adenocarcinoma as much. There are articles reported that small cells