颅椎交界区及后颅凹骨性畸形较多，头颅平片及不同体位，平面体层摄影对此类疾病可以明确诊断。但由于缺乏对这些疾病系统的了解和对各种摄影方法适应症的认识，给病变的诊断带来困难。为此作者对本院１９８５至１９９５年各种颅底、后颅凹及环枢椎畸形病例进行分析，并对各种? Skull junction and posterior cranial osteoarthritis more, plain skull and different positions, flat tomography can be a clear diagnosis of such diseases. However, due to the lack of understanding of these disease systems and understanding of various photographic methods, it is difficult to diagnose the lesions. To this end the author of the hospital from 1985 to 1995 all kinds of skull base, posterior fossa and cricoid axial deformity cases were analyzed and a variety of?