Publications by authors named "Masahiro Ishihara"

Background: In a 31-year-old male, psoriasis vulgaris (PV) of the skin caused paraparesis attributed to a L3-L4 epidural spinal abscess that required emergent surgical decompression.

Case Description: A 31-year-old male presented with lower back pain and cauda equina compression attributed to a magnetic resonance-documented L34 enhancing lesion consistent with a spinal epidural abscess (SEA). The skin over the L3-L4 level revealed severe PV that proved to be the likely etiology of the right-sided paraspinal muscle abscess, infected right L3-L4 facet joint, and SEA.

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Objective: We report a case of acute middle cerebral artery (MCA) occlusion caused by tumor embolism.

Case Presentation: A 64-year-old man with lung cancer presented with sudden onset left-sided hemiparesis and sensory disturbance. Diffusion-weighted imaging (DWI) revealed hyper-intense foci in the right MCA territory and magnetic resonance angiography (MRA) demonstrated right MCA M2 segment occlusion.

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Objective: Intravenous (IV) recombinant tissue plasminogen activator (rt-PA) and mechanical thrombectomy (MT) are effective treatments for acute ischemic stroke (AIS). However, the treatment for AIS in pregnancy is not established because no clinical trials have included pregnant patients. We present a case of middle cerebral artery (MCA) M2 segment occlusion in pregnancy treated with IV thrombolysis and endovascular therapy.

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Background: Pseudoaneurysm of the internal carotid artery (ICA) is a very rare but potentially fatal complication of deep neck space infection.

Methods: This paper describes a very rare case of an ICA pseudoaneurysm rupture in the sphenoid sinus caused by a deep neck abscess.

Results: A 62-year-old male with a deep neck space infection underwent surgical drainage.

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A 70-year-old man presented with right renal cell carcinoma with inferior vena caval tumor thrombus into the right atrium. CT Scan presented local invasion and lymph node metastasis. We estimated inoperative case, so he was started sunitinib.

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Background: Spontaneous regressions of brain stem gliomas are extremely rare. Only six cases have been reported in the literature.

Case Presentation: We describe the case of a patient who was diagnosed with a pontomedullary dorsal brain stem glioma at the age of 15 years.

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The efficacy of olfactory mucosal autografts (OMAs) for chronic spinal cord injury (SCI) has been reported, but there is no report documenting electrophysiological conductivity via the emergence of motor evoked potentials (MEPs). We report the case of a 39-year-old man with chronic, complete SCI at T8, who exhibited MEPs after OMA transplantation, and, with intensive rehabilitation, was ultimately able to ambulate with short leg braces and Lofstrand crutches. The initial injury occurred in a motor vehicle accident in November 1999 and resulted in a complete loss of sensorimotor function below T8.

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OBJECTIVE Diffuse astrocytomas (DAs) have a high recurrence rate due to diffuse infiltration into the brain and spinal cord. Micro RNAs (miRNAs) are small noncoding RNAs that regulate gene expression by binding to complementary sequences of target messenger RNA (mRNA). It has been reported that miRNA-22 (miR-22) is involved in the invasion of some cancer cell lines.

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Intramedullary spinal cord metastasis of non-small cell lung cancer is rare, and it has a short prognosis. We report a 53-year-old man diagnosed with cT4N0M0, stage IIIA squamous cell lung cancer. Ten months after left pneumonectomy (pT4N0M0), an intramedullary spinal cord tumor developed at the axis level.

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Recent studies of spinal cord axon regeneration have reported good long-term results using various types of tissue scaffolds. Olfactory tissue allows autologous transplantation and can easily be obtained by a simple biopsy that is performed through the external nares. We performed a clinical pilot study of olfactory mucosa autograft (OMA) for chronic complete spinal cord injury in eight patients according to the procedure outlined by Lima et al.

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Article Synopsis
  • Enzalutamide is an oral medication that helps prolong survival in men with castration-resistant prostate cancer (CRPC) and was evaluated for its effectiveness and safety in a study of 73 patients.
  • The study found that patients without prior docetaxel treatment had a better response to enzalutamide, with 61.4% achieving a significant reduction in PSA levels, compared to only 24.1% in those who had received docetaxel.
  • Common side effects included fatigue, anorexia, and nausea, and some patients experienced a PSA flare, which can occur in those who respond to treatment.
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Olfactory stem cells are generated from olfactory mucosa. Various culture conditions generate olfactory stem cells that differ according to species and developmental stage and have different progenitor or stem cell characteristics. Olfactory spheres (OSs) are clusters of progenitor or stem cells generated from olfactory mucosa in suspension culture.

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Study Design: Using biotinylated dextran amine (BDA) and wheat germ agglutinin (WGA) tracers, we measured the effectiveness of olfactory mucosa (OM) transplantation as a scaffold in a rat model of chronic spinal cord injury (SCI).

Objective: We examined whether OM transplantation for chronic SCI in rats results in reconstruction of neuronal pathways by both regeneration of the remaining axons and supply of OM-derived trans-synaptic neurons.

Summary Of Background Data: OM is one of the ideal scaffolds for axonal regeneration after chronic SCI.

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Among the possible sources of autologous cells and tissues for use in spinal cord injury grafts, one promising source is the olfactory mucosa containing olfactory ensheathing cells and neural progenitor cells. Olfactory mucosa transplantation for spinal cord injury has been effective in animal models and in pilot clinical trials. However, the contributions of olfactory ensheathing cells and neurons in olfactory mucosa are unclear.

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Background: Bobble-head doll syndrome is a rare and surgically treatable movement disorder characterized by up-and-down (yes-yes) head bobbing occurring at a rate of 2-3 Hz. Side-to-side (no-no) head bobbing is less frequently described. Bobble-head doll syndrome is usually associated with dilation of the third ventricle, but is rarely associated with posterior fossa disease.

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The olfactory epithelial layer contains multipotent horizontal basal cells (HBCs) that differentiate into olfactory sensory neurons. Here, we show that rat HBCs express oligodendrocyte progenitor cell (OPC) and astrocyte markers. We generated olfactory sphere (OS) cells in cultures that were derived from adult rat olfactory mucosa.

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Intradural extramedullary spinal ependymomas are extremely rare. Herein, we describe a lesion-type spinal ependymoma that followed a malignant course, and discuss its clinical presentation, etiopathogenesis, and treatment. We present a patient who was diagnosed with an intradural extramedullary spinal tumor at T4-T6.

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Spinal cord injury is often followed by disuse muscle atrophy. The effect of disuse muscle atrophy on motor neurons below the level of spinal cord lesions is not fully understood. We produced spinal contusions in the mid-thoracic segment (Th7/8) of rats.

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Traumatic intracranial aneurysms are rare, usually occur as a result of traffic accidents, and are associated with high rates of morbidity and mortality. A 12-year-old boy was admitted for treatment of cerebral hemorrhage in the left frontal lobe, 3 months after a traffic accident. Angiography revealed an intracranial aneurysm of the distal part of the azygos anterior cerebral artery (ACA).

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Brain abscess formation is a rare complication of intracranial endovascular treatment. To our knowledge, all previous reports of brain abscess formation have been associated with treatments involving the introduction of foreign materials. A 75-year-old man was admitted to hospital for acute stroke.

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Although recent studies have shown that cell transplantation is effective in promoting regeneration of the central nervous system (CNS) of adult mammals, functional recovery has been reported to be limited. In vitro models of axonal outgrowth assays are often used as easy methods for screening cells for transplantation but often fail to reflect the physiological conditions of in vivo CNS injury models. In order to bridge the gap between in vitro and in vivo models, we have established a new organotypic co-culture system comprising cortical tissue and a Matrigel containing several cell types that are candidates for transplantation therapy for CNS injury.

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The present study evaluated the efficiency of laser irradiation for treating discogenic low back pain. Discogenic low back pain is believed to result from the degeneration and disruption of outer fibers of the intervertebral disc annulus, leading to a cycle of persistent inflammation, damage to the disc matrix, and sensitization of developed annular nociceptors. We selected 11 patients as subjects on the basis of clinical findings and the results of provocative disc blockade.

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Bow hunter's stroke is typically due to mechanical compression or stretching of the dominant vertebral artery (VA) during contralateral head rotation against the bony elements of the atlas and axis. We report a case of vertebrobasilar insufficiency due to bilateral vertebral artery occlusion at the left C3-4 and the right C1-2 junction on rightward head rotation. A 64-year-old man experienced ischemic symptoms during 90° head rotation to the right with complete resolution of symptoms after returning his head to the neutral position.

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