Ichiro Kamata

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The authors report the treatment of seven intracranial aneurysms in six patients with direct infusion of cellulose acetate polymer solution, a new liquid thrombotic material. These aneurysms were considered inoperable because of their size or location, or because of the patient's neurological condition. This material avoids the difficulties associated with(More)
Twenty-eight patients with spontaneous carotid-cavernous sinus fistulas (CCFs) were treated using a variety of techniques. Three of four patients with direct CCFs underwent intravascular embolization with a detachable balloon. Embolization with polyvinyl alcohol particles through an external carotid endoarterial route was used in six patients with indirect(More)
Cellulose acetate polymer solution is a liquid thrombotic material that hardens into the shape of an aneurysm into which it is injected. Therapy using this solution is a rapid technique that helps prevent the rupture of aneurysms, especially those that extravasate contrast material during angiography in the acute stage of subarachnoid hemorrhage. Using this(More)
Moyamoya syndrome is defined as the development of collateral anastomosis pathways at the base of the brain, associated with chronic progressive stenosis of the carotid fork. Both reconstructive vascular surgery and conservative strategies are used to treat this syndrome, but the latter cannot prevent the disease from progressing. We describe the procedure(More)
This experimental study evaluated the effect of intrathecal injection of tissue-type plasminogen activator followed by cisternal drainage in the ultra-early stage of aneurysmal subarachnoid haemorrhage to prevent vasospasm. Twenty Japanese white rabbits were divided into five groups. Either tPA (groups A, B, and E) or saline (groups C and D) was injected(More)
OBJECTIVE AND IMPORTANCE Selective posterior rhizotomy (SPR) has been performed mainly in children with cerebral palsy. Seldom has the use of SPR been reported for reduction of spasticity after stroke. We describe two elderly patients with hemiplegia who underwent unilateral SPR for pain caused by spasticity after stroke. CLINICAL PRESENTATION The first(More)
A 55-year-old man who suffered a head injury resulting in a left traumatic carotid-cavernous fistula was successfully treated with an intravascular detachable balloon. A pseudoaneurysm formed adjacent to the balloon. Seven months after the initial procedure, treatment with cellulose acetate polymer, a new liquid thrombotic material, occluded the(More)
Six aneurysms in five patients with acute aneurysmal subarachnoid hemorrhages were treated with direct thrombosis using cellulose acetate polymer within 4 hours of rupture. The aneurysms involved the internal carotid and posterior communicating arteries (two patients), the anterior choroidal artery (one patient), the bifurcation of the basilar artery (one(More)
Twelve patients with Hunt and Hess neurological Grades III to V underwent thrombosis of aneurysms using cellulose acetate polymer within 23 hours of aneurysm rupture. On computerized tomography (CT), nine of these patients had difuse or localized thick subarachnoid blood clots, two had diffuse thin clots and one had intraventricular clots. Immediately after(More)
In patients with advanced moyamoya disease, reconstructive surgery alone may not prevent the deterioration of blood flow in the territory of the anterior cerebral artery. These types of surgery include superficial temporal artery-to-middle cerebral artery anastomosis and encephalo-duro-arterio-myo-synangiosis (EDAMS). Bilateral(More)