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CT-guided stereotaxic biopsy was performed on 13 cases of the brain tumor using Leksell's CT stereotaxic system under control of Hitachi W-3 scanner. Trepanation was put on near to the coronal suture, and biopsy needle was inserted parallel to sagittal plane in two cases. The course of the needle was showed by the sagittal reconstructive CT. In 11 cases, biopsy needle was inserted parallel to the CT slice. Trepanation was put on frontal area in nine cases of frontal tumor, and on posterior temporal area in four cases of occipital or thalamic tumor. The course of needle was showed on one CT slice. Stepwise biopsies were performed using spiral biopsy needle. Minimal bleeding occurred after biopsy in one case, however, was stopped by induced hypotension. Post-operative CT revealed no hematomas in all of the cases. There was no case with postoperative worsening of the symptoms. Ommaya's reservoir was implanted in three cases with cyst. Comparison of tissue sample with CT findings is possible in our CT-guided stereotaxic method, because all the course of biopsy track was confirmed by the CT.
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