[The clinical picture and course in basilar impression].

We have reviewed 29 cases of patients who suffered from basilar impression and had undergone hospital treatment since 1969. 12 of these patients were reexamined. The predominant symptoms were lesions of the long tracts while the ,,classical signs" such as headache and nystagmus occurred less frequently than expected. Only a quarter of our patients showed a marked deterioration during follow-up. The outcome for four patients who underwent operation is reported.