Results: Partial noncleavage of the middle interhemispheric in different level were found in all four patients.The deep gray nuclear, thalami and sylvian were developed anomaly.

• 结果：4例患者双侧大脑半球不同程度的无分离，大脑深部皮质核团、间脑及大脑外侧裂的位置形态有不同程度的发育异常。