In order to evaluate the safe ligation time and sites of dural venous sinuses during neurosurgical operation, systemic arterial pressure(SAP), cerebral perfusion perssure(CPP), intracranial pressure (ICP) and intrasinal pressure(ISP) were measured in cats through neuromonitor before and after obstruction of anterior 1/3, middle 1/3, posterior 1/3 of the superior sagittal sinus and the results were as follows. There were no significant increases of pressures after obstruction of anterior 1/3 of the superior sagittal sinus. In the obstructed middle 1/3 of the superior sagittal sinus group, signifi6int increases were seen un the m-SAP within 2, 4 and 6 minutes, the m-ICP within 2-7 minutes, the r.i-ISP within 14 minutes after obstruction. In the -obstructed posterior 1/3 of the superior sagittal sinus group, there were significant increases of m-SAP within 2, 4 and 6 minutes, the m-ICP within 27 minutes, the m-ISP within 13 minutes. In the obstructed Torcular Herophili,group, there were significant increases of the m-SAP within 1-2 and 4-7 minutes, the m-ICP within 36 minutes and the m-ISP within 1-7 minuted and less significant dercreases of the m-CPP within 5-7 minutes after obstruction. In the obstructed right transverse sinus group, significant increases of the m-ICP and the m-ISP were seen within 1-7 minutes after obstruction. there were no remarkable changes in the obstructed left transverse sinus group.
Animals ; Arterial Pressure* ; Cats* ; Intracranial Pressure* ; Ligation ; Perfusion* ; Superior Sagittal Sinus ; United Nations

Spinal fusion has performed for instability and anatomical reconstruction since 1985 by Barthe. Bone grafts and synthetic materials has been used for spinal fusion, but they have several limitations and complications. Recently a new synthetic polymer B.O.P.(Biocompatible Osteoconductive Polymer) was developed and it overcome the limitations of other materials. The B.O.P. showed no foreign body reaction and gave scaffolding for the osteoconduction and osteointegration. Authors operated 35 cases of spinal fusion with B.O.P. and the results and literature reviews were discussed.
Bone Regeneration ; Bone Substitutes ; Foreign-Body Reaction ; Polymers ; Spinal Fusion* ; Transplants

Anterior interbody fusion has used for instability and anatomical reconstruction in various cervical diseases since 1958 by cloward. Bone grafts such as autograft, allograft, xenograft and synthetic materials were utilized in fusion as a graft material. But conventional fusion materials have problems including postoperative morbidity, transmission of diseases, foreign body reaction, collapse, prolongation of operation time. A new synthetic material, Biocompatible Osteoconductive Polymer(B.O.P) is developed and it was useful for cervical anterior interbody fusion as a substitute for other fusion materials.
Allografts ; Autografts ; Foreign-Body Reaction ; Heterografts ; Transplants

The authors performed 19 cases of percutaneous automated discectomy using Nucleotome between Feb, 1988 and Jan, 1993. The mean age was 33 years ranging from 20 to 56 years. Eleven of the patients were men and eight were women. One level nucleotomy was done in 14 cases, two level in 4 cases and three level in 1 cases. Overall success rate was 63%. No intraoperative and postoperative complications occurred except transient back pain in 3 cases.
Back Pain ; Diskectomy* ; Female ; Humans ; Male ; Postoperative Complications

In an attempt to eliminate some negative aspects of conventional extensive laminectomy, 4 cases of multiple level of cervical compression myelopathy, 1 OPLL (ossification of posterior longitudinal ligament) and 3 cervical stenosis, were treated with a technique of expansive laminoplasty. Operative results in all patients were satisfactory without surgical complications and all patients had a neurological improvement. We suggest that our technique is more effective one for cervical canal stenosis, OPLL, and spondylosis than conventional extensive laminectomy.
Constriction, Pathologic ; Humans ; Laminectomy ; Laminoplasty* ; Spinal Cord Diseases* ; Spondylosis

A case of upper thoracic vertebral hemangioma with epidural mass is reported. Preoperative selective angiography with embolization is the procedure of choice for reducing intraoperative bleeding. There was progressive postoperative improvement of the myelopathy.
Angiography ; Hemangioma* ; Hemorrhage ; Spinal Cord Diseases

Astrocytoma in the thalamus in not so frequent in incidence (1%). Moreover, bilateral thalamic tumor is rare. Certain tumors of the thalamus are considered resectable but most of thalamic tumors are thought to be untouchable. Bilateral thalamic astrocytoma with hydrocephalus was diagnosed by stereotactic biopsy and ventriculoperitoneal shunt operation was done with result of improvement. We report a case of astrocytoma in the bilateral thalamus with literature review.
Astrocytoma* ; Biopsy ; Hydrocephalus ; Incidence ; Thalamus* ; Ventriculoperitoneal Shunt

The introduction of computed tomography in the mid 1970s radically altered the practice of both neuroradiology and steteotactic neurosurgery. Shortly after the introduction of CT, work began on a variety of methods to guide biopsy instruments to brain lesions demonstrated on CT scan. And so, a prototype Brown-Roberts-Wells(BRW) CT stereotactic system was been available to us. We report its utilization in evaluation of less accessible brain lesions using BRW system; 22 superfical lesions including the motor cortex, 3 brain stem lesions, 5 parasellar lesions, 3 pineal lesions, 3 C-p angle lesions, 3 multiple lesions. There is one complication; intratumoral bleeding. There is no mortality in this series. The diagnostic rate is 88.9%. The indications of BRW of guidance stereotactic biopsy are considered as followings; 1) Adverse medical condition. 2) Highly malignant lesions. 3) Multiple lesions. 4) Lesions near by motor cortex. 5) Brain stem lesions. 6) Deep seated lesions. 7) Small sized lesions.
Biopsy* ; Brain ; Brain Stem ; Hemorrhage ; Mortality ; Motor Cortex ; Neurosurgery ; Tomography, X-Ray Computed

Posterior stabilization of unstable cervical spine injury using metal plate and screw has been commonly used in Europe but very rarely in Korea where it has been usually achieved with wires supplemented by bone graft. We have experienced 11 patients of unstable lower cervical spine injuries which were stabilized with posterior cervical plate without bone graft. One patient was total quadriplegia and two patients showed minor motor and sensory changes and the others were neurologically intact. Operations were performed within 10 days after trauma(average 4.9 days) except 2 cases of late instability. Most of the patients could ambulate the day after operation with a Philadelphia collar which was kept for 3 months. We achieved good postoperative alignment of injured cervical spine and tolerable neck motion limitation and we experienced no surgical complication. So we suggest that posterior cervical plate fixation technique is a good method of cervical stabilization for lower cervical spine injury, especially when posterior compartment injury is predominant.
Europe ; Humans ; Korea ; Neck ; Quadriplegia ; Spine ; Transplants

Authors measured the Y-shaped angle made by both yellow ligaments and both laminae named Y-angle at the spinal CT scan in normal and lumbar stenosis group. The normal range of Y-angle is between 60 degrees and 95 degrees. Lumbar stenosis is classified into narrow Y-angle stenosis(<60 degrees) and wide Y-angle stenosis(>95 degrees) by Y-angle. Narrow Y-angle stenosis is most common in degenerative spondylotic stenosis. Wide Y-angle is most common in congenital stenosis. The Y-angle is a simple and useful diagnostic indicator in the diagnosis of lumbar spinal stenosis on CT scan and MRI scan.
Constriction, Pathologic* ; Diagnosis ; Ligaments ; Magnetic Resonance Imaging ; Reference Values ; Spinal Stenosis ; Spine* ; Tomography, X-Ray Computed