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The accuracy of a novel frameless stereotactic system was determined during 10 surgeries performed to resect brain tumors. An array of three charge-coupled device cameras tracked the locations of infrared light-emitting diodes on a hand-held stylus and on a reference frame attached to the patient's skull with a single bone screw. Patient-image registration(More)
Dynamic intraoperative imaging of the spinal cord was done using a real-time ultrasound scanner. Prior to opening the dura mater the neurosurgeon is able to "explore" the intradural space and with a 7.5 MHz transducer visualize the normal spinal cord, including the central canal and the dentate ligaments. Anterior and posterior spinal arteries may be seen(More)
The authors report a case of carcinoma of the choroid plexus and review the 22 cases reported since 1844 that adhere to the criteria for primary choroid plexus carcinoma. Two-thirds of the tumors are found in children and all of these are located in the lateral ventricles. In adults most of the tumors are present in the fourth ventricle. Differentiation of(More)
Late results of cervical disc surgery have been reported and statistically studied in 383 cases: 83% were lateral discs, 13% were central spondylosis discs, and 4% central soft discs. Central spondylosis occured at a higher spinal level, and caused cord compression with or without weakness of the hands, but no pain. A posterior approach was used in all(More)
Intraoperative real-time ultrasound imaging in the neurosurgical operating room is most useful in localizing, characterizing, and guiding the instrumentation of lesions of the brain and spinal cord. In the future, more and more operative procedures will be done using intraoperative ultrasound guidance. The ultrasound scanner, as developed for neurosurgery,(More)
Of 488 children with central nervous system neoplasms, 43 (8.8%) had glioblastomas, 22 of which were in the cerebral hemispheres, 16 in the brain stem, two in the cerebellum, and three in the spinal cord. The male to female ratio was 3:2. Glioblastoma multiforme of the cerebral hemispheres occurred at a mean age of 12.7 years, and the frontal lobe was the(More)
The pathological changes occurring in the thoracic spinal cords of 41 cats were studied by light microscopy at 4 hours, 4 weeks, and 4 months after graded transdural trauma. Alterations characteristic of a vascular injury proportionate to the magnitude of the original trauma which results in tissue hypoxia, destruction, and reparation were identified at(More)
In an attempt to investigate the role of tissue fibrinolytic activity in the resolution of intracerebral hematoma, an experimental model of intracerebral hematoma was developed in the rat. The fibrinolytic activity was studied using a histochemical fibrin slide technique. A total of 59 adult male rats were studied. Twenty-nine rats were used for developing(More)