Norio Yoshimasu

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OBJECT Factors affecting the postoperative recurrence of chronic subdural hematomas (CSDHs) have not been sufficiently investigated. The authors have attempted to determine features of CSDHs that are associated with a high or low recurrence rate on the basis of the natural history of these lesions and their intracranial extension. METHODS One hundred six(More)
OBJECT This study was conducted to determine the best position for the subdural drainage catheter to achieve a low recurrence rate after burr-hole irrigation and closed-system drainage of chronic subdural hematoma (CSDH). METHODS The authors studied 63 patients with CSDH in whom the drainage catheter tip was randomly placed and precisely determined on(More)
A rare case is presented in which a foreign-body granuloma developed at the site of muslin wrapping and Aron Alpha A coating of an internal carotid artery aneurysm. The importance of avoiding the use of muslin, especially close to the optic nerve and chiasm, is emphasized.
A case of the falx tumor of a 60-year-old man is reported. The tumor consisted of a pleomorphic mixture of lymphoid cells, histiocytes, atypical reticulum cells, and bizarre giant cells, including the diagnostic Reed-Sternberg cells. No transitional forms among these cells were observed. This is the first report of primary Hodgkin's disease of the dura(More)
1. Extracellular microelectrode recording was carried out in human epileptogenic cortex and in the area surrounding the focus in three cases and in the hippocampus of two cases. 2. It was impossible to identify primary "epileptic" or "pacemaker" neurons. Emphasis is placed on the interactions among the neuronal aggregates at the focus for generating the(More)
A case of traumatic intracavernous aneurysm is presented. The aneurysm at the siphon of the internal carotid artery was produced as a result of injury during an operation for chronic sinusitis. In addition to the formation of the aneurysm, the angiogram showed an irregular intimal dissection along the internal carotid artery distal to the aneurysm. To(More)
The present technique was developed to overcome some of the disadvantages of measuring cerebral blood flow by radionuclide methods, such as poor localization of flow values and errors that result if the brain is pathological and local partition coefficients are altered. Serial CT scanning in humans was carried out during and after inhalation of 50 to 70%(More)
The rupture of a saccular aneurysm during a direct attack can led to a disastrous result unless deep hypotension has been induced before the dissection. If the mean pressure recorded through a microcatheter introduced into the radial artery is at 30 mm Hg level or below the rupture remains circumscribed and the operative field can be dried easily with(More)
Heretofore, the rCBF of brain tumours has been measured by the 133Xe clearance method, but the resolving power of this method is limited and flow values measured by this method correlate poorly with the anatomical structure. On the other hand, our xenon-enhanced method has several advantages over the conventional isotope method and enables us to evaluate(More)