脑囊瘤是脑膜原发性肿瘤,通常临床为良性过程,一般采用外科切除根治性治疗。以往曾报道过罕见的恶性脑膜瘤。脑膜瘤最常见的染色体异常为22号单体。在细胞遗传学上这种类型的脑肿瘤也常见到正常的核型。除22号染色体外,染色体的丢失或重排的核型演化,看来与临床浸润过(?)有关。本文报道组织学和细胞遗传学发现的两种不同类型脑膜瘤:一种是典型的脑膜瘤,另一种是非典型的脑膜瘤。病 Brain tumor is a primary tumor of the meninges, usually a benign clinical process, the general use of surgical excision radical treatment. In the past have been reported rare malignant meningiomas. The most common chromosomal abnormalities in meningiomas are Unit 22. Cytogenetically this type of brain tumor is also common to normal karyotypes. In addition to chromosome 22, chromosome loss or rearrangement karyotype evolution appears to be associated with clinical infiltration (?). This article reports two different types of meningioma found histologically and cytogenetically: one is a typical meningioma and the other is an atypical meningioma. disease