颅内蛛网膜囊肿（ＩＡＣ）是较常见的颅内占位性病变之一，分原发和继发。本组报告３２例原发蛛网膜囊肿，其中手术治疗２１例。现对手术方法的选择及预后进行探讨。１临床资料３２例中，男２４例，女８例，年龄４岁～５６岁，２０岁以下２３例。部位：大脑半球１２例，外侧裂 Intracranial arachnoid cyst (IAC) is one of the more common intracranial space-occupying lesions, sub-primary and secondary. The group reported 32 cases of primary arachnoid cysts, including 21 cases of surgical treatment. Now the choice of surgical methods and prognosis. 1 Clinical data 32 cases, 24 males and 8 females, aged 4 to 56 years old, 23 cases under the age of 20. Location: hemisphere in 12 cases, lateral fissure