Hideki Oka

Carotid web as a risk factor for large stroke: Prevalence in consecutive carotid endarterectomy cases

Shigeomi Yokoya, Hidesato Takezawa, Hideki Oka

Background: Carotid web (CW) is an intraluminal, ridge-like projection arising from the posterior wall of the carotid bifurcation. It is recognized as a risk factor for ischemic stroke and has been increasingly identified as a potential cause of recurrent embolic strokes of …

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Eye Discomfort and Blurred Vision Preceding Oculomotor Nerve Palsy in a Warning Headache:A Case Report

Shigeomi Yokoya, Hideki Oka

Cerebral aneurysms can present with warning headaches before rupture or during minor leaks. Internal carotid artery-posterior communicating artery (IC-PC) aneurysms are among the few aneurysms for which the clinical observation of growth and associated symptoms is possible. Enlargement or morphological changes may …

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Intraosseous dural arteriovenous fistula draining into the diploic veins treated with transarterial embolization: A case report

Midori Ichihashi, Hidesato Takezawa, Manato Sakamoto, Kengo Kishida et autres

This study presents the rare case of an intraosseous dural arteriovenous fistula (DAVF) draining into the diploic veins in the left frontal bone with high-flow feeder, successfully treated with transarterial Onyx embolization. A 59-year-old male exhibited mild right hemiparalysis and aphasia without …

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Olfactory groove schwannoma complicated by communicating hydrocephalus

Kengo Kishida, Hideki Oka, Manato Sakamoto, Shigeomi Yokoya

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Unilateral hydrocephalus due to membranous occlusion of the foramen of Monro following extraventricular drainage and ventriculoperitoneal shunt for hydrocephalus after subarachnoid hemorrhage

Kengo Kishida, Hideki Oka, Manato Sakamoto

We present a case of unilateral hydrocephalus caused by membranous occlusion of the foramen of Monro in a 56-year-old male. The patient was initially treated with external ventricular drainage and a ventriculoperitoneal shunt for secondary hydrocephalus due to subarachnoid hemorrhage. However, unilateral …

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Acute Occlusion of One Side of Bilateral Infraoptic Anterior Cerebral Arteries

Kengo Kishida, Hideki Oka, Hitoshi Kawano, Hidesato Takezawa

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Transradial versus transfemoral access for middle meningeal artery embolization: Choice of the access route considering delirium in the elderly

Manabu Yamamoto, Gaku Fujiwara, Hidesato Takezawa, Yasunori Uzura et autres

Background: Treatment of chronic subdural hematoma (CSDH) with middle meningeal artery embolization (MMAE) is becoming well established. Transradial artery access (TRA) is considered less invasive than transfemoral artery access (TFA) and is increasingly indicated in the field of endovascular therapy. Therefore, this …

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Short-term functional outcomes and treatment trends for branch atheromatous disease and lacunar infarction: a retrospective cohort study of a nationwide multicenter registry

Gaku Fujiwara, Hideki Oka, Akihiro Fujii

OBJECTIVE: Branch atheromatous disease (BAD) is a form of ischemic stroke that presents with imaging findings similar to those of lacunar infarction, but has a different pathogenesis and is known to cause progressive paralysis. Due to regional variations, the epidemiology of BAD …

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Regional Disparities in Hyperacute Treatment and Functional Outcomes after Acute Ischemic Stroke in Japan

Gaku Fujiwara, Naoki Kondo, Hideki Oka, Akihiro Fujii et autres

AIM: This study investigated the impact of rurality on acute ischemic stroke (AIS) outcomes, emphasizing the hyperacute phase, in which immediate care is crucial. METHODS: This retrospective cohort study analyzed data from a large Japanese hospital network covering AIS patients from 2013-2021, …

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Balloon-Assisted Stent Visualization: A Simple Technique for Precise Measurement of Previously Placed Stent Diameter

Manato Sakamoto, Shigeomi Yokoya, Hidesato Takezawa, Midori Ichihashi et autres

Abstract Stent-assisted coil embolization is effective for treating intracranial aneurysms, improving outcomes and reducing recurrence rates. However, accurately measuring the diameter of a previously placed stent during imaging can be challenging due to coil artifacts. This poses difficulties in determining the coil …

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Double-tube burr hole irrigation in the treatment of subdural empyema following chronic subdural hematoma surgery: A case report

Manato Sakamoto, Shigeomi Yokoya, Midori Ichihashi, Kengo Kishida et autres

INTRODUCTION AND IMPORTANCE: Subdural empyema (SE) following chronic subdural hematoma (CSDH) surgery is an uncommon but serious complication. The best treatment approach, typically a choice between craniotomy and burr hole surgery, is still debated. This case report introduces an innovative method using …

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Visual Field Preservation in the Treatment of the Brain Arteriovenous Malformation Located near the Lateral Ventricle

Kengo Kishida, Hideki Oka, Midori Ichihashi, Manato Sakamoto et autres

脳動静脈奇形（AVM）の治療では，nidusやfeeder，drainerの位置に基づいて，術前塞栓や手術アプローチについて入念かつ複合的な治療方針の検討が必要である．側脳室近傍に存在する動静脈奇形の治療には視野障害や言語機能障害のリスクが伴う．2010年1月から2022年9月に当院で外科的手術を行った動静脈奇形41例のうち，側脳室近傍に病変が存在し，術前塞栓および外科的摘出を行った3例について，おもに視野障害の視点から，画像所見や治療方針や機能予後をまとめた．

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