No shinkei geka. Neurological surgery
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Review Case Reports
[Posterior cerebral aneurysm associated with complete occlusion of the middle cerebral artery caused subarachnoid hemorrhage: a case report].
The authors reported a rare case of subarachnoid hemorrhage (SAH) from a left posterior cerebral artery (PCA) aneurysm at P2 portion associated with complete occlusion of the ipsilateral middle cerebral artery (MCA). A 65-year-old female suddenly complained of severe headache and was admitted with disturbance of consciousness. Apart from her somnolent condition, she showed no significant neurologic deficits such as aphasia or right hemiparesis. ⋯ In this paper we discussed the etiology of P2 portion aneurysm from the literature and by angiographical morphologies. In this case, the P2 portion aneurysm was considered to be produced by increase of hemodynamic stress to the PCA via fetal type PCo due to MCA occlusion. To our knowledge, this paper is the only report of PCA aneurysm associated with MCA complete occlusion brought about by SAH.
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Comparative Study Clinical Trial Controlled Clinical Trial
[Evaluation of carotid artery stenosis with three-dimensional CT angiography and surgical revascularization].
The accuracy of three-dimensional CT angiography (3D-CTA) for delineating atherosclerotic carotid stenosis was examined in comparison with digital subtraction angiography (DSA) in symptomatic patients. In cases undergoing carotid endarterectomy (CEA), the clinical usefulness of 3D-CTA for surgical planning was also evaluated in the light of intraoperative findings. From July 1992 to June 1995, 52 patients suffering from internal carotid ischemia and/or presenting carotid bruit were evaluated to detect carotid bifurcation stenosis by 3D-CTA. ⋯ Using MIP reconstructions and two-dimensional original images it was found that ICA occlusion was apparently distinguished from high grade ICA stenosis. SSR provided valuable informations during CEA for atherosclerotic plaque regarding anatomical relationship with the internal jugular vein and bony structures. This advanced means of 3D-CTA can be adequate as a screening method to detect carotid stenosis in symptomatic patients and useful for surgical planning of CEA and post-operative follow-up examination.
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Case Reports
[Traumatic basilar artery dissection presenting with "locked-in" syndrome: report of a case].
We encountered a case of traumatic basilar artery dissection presenting with "locked-in" syndrome. A 46-year-old-man fell approximately 2 meters and landed in an inverted position. He was admitted to our hospital after 4 days. ⋯ It is suggested that the cause of the infarction of the ventral portion of the pons was the occlusion of the perforating arteries due to the basilar artery dissection, and the mechanism of the basilar artery dissection was the hyperextension or hyperflexion of the basilar artery by the movement of the brain stem caused by the traumatic impact. Repeated angiography revealed gradual improvement. Eventually he freed himself from the "locked-in" syndrome.
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Knockout in boxing entails deliberate production of the state of unconsciousness. Acute subdural hematoma which is the most common acute brain injury in boxing, accounts for 75% of all acute brain injuries and is the leading cause of boxing fatalities. The aim of this study is to evaluate acute subdural hematoma caused by professional boxing by analyzing the content of bouts, the level of consciousness on admission, CT scan, therapy and outcome 3 months after admission. ⋯ Overall outcome was better than that published in previous reports and also than that observed in other head injuries, for example, traffic accident and fall. The reasons for this could be that the patients were younger, that there was immediate surgical treatment, and that brain injury without cerebral contusion had contributed to better outcome. Finally, the best medical management intervention seems to be to diagnose and treat the lesions as early as possible after occurrence of subdural hematoma.
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Obliteration procedures for large high-flow arteriovenous malformations (AVM) were simulated using a compartmental flow model to investigate the role of altered autoregulatory conditions in the development of hyperperfusion and normal perfusion pressure breakthrough (NPPB). Since the arterioles are primarily responsible for autoregulatory function, the role of these structural changes on the development of hyperperfusion was also studied by evaluating the wall thickness (T), internal radius (Ri) and tangential wall stress (sigma). As the AVM flow was decreased during the obliteration procedures, the perfusion pressure (delta P) of the brain tissue surrounding the AVM increased. ⋯ If the upper limit of the autoregulatory pressure range was assumed to decrease and become the yield point in the brain surrounding high flow AVMs, hyperfusion or NPPB could be considered to develop in the conditions with the autoregulatory pressure range being narrowed and/or shifted to the lower pressure level. Induced systemic hypotension was found to be effective in reducing the magnitude of Fb, delta P, and Pf when induction was appropriately performed in stepwise fashion. T/Ri and sigma were kept in narrow ranges compared to those before induction of hypotension.