Hiromasa Niimi

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PURPOSE To evaluate the utility and possible increased sensitivity of fluid-attenuated inversion recovery (FLAIR) images for the detection of tubers in patients with tuberous sclerosis, compared with standard T2-weighted images, and to evaluate whether the tubers are correlated with neurologic symptoms. METHOD We examined the number, size, and location of(More)
A 17-year-old male was diagnosed as having Alexander disease from the clinical manifestations (psychomotor deterioration and megalencephaly), neuroradiologic findings (frontal dominant leukodystrophy), and elevation of alpha B-crystallin and heat shock protein 27 in the cerebrospinal fluid. He exhibited increased attenuation on computed tomography and T1(More)
An 11-year-old girl with Down syndrome is reported with moyamoya syndrome; she presented with chorea and mental regression, but had no hemiplegia or convulsions. Magnetic resonance imaging and magnetic resonance angiography were valuable for diagnosis of moyamoya syndrome. It is suggested that moyamoya syndrome be considered as a possible cause of(More)
To determine whether magnetic resonance angiography with selective maximum intensity projection can facilitate the detection of cerebral moyamoya vessels in patients with childhood moyamoya disease, six patients with moyamoya disease (6 to 9 years old) and ten controls (4 to 16 years old) were evaluated by means of high resolution magnetic resonance(More)
To determine the extent of brain damage in children with spastic diplegia, we analyzed the true midsagittal magnetic resonance imaging findings for the corpus callosum in 43 children with spastic diplegia and in 69 neurologically normal children. In the normal children, the thicknesses of the genu, midbody, splenium and the entire corpus callosum were found(More)
The case of a 5-year-old female with an intradural spinal meningioma is presented. She showed slowly progressive muscle weakness of the lower extremities commencing at 3 years. Spinal magnetic resonance imaging (MRI) demonstrated an intradural mass extending from the eleventh thoracic vertebra to the fifth lumbar vertebra, which was excised totally by means(More)
Longitudinal MR imaging and proton MR spectroscopy were performed in an 11 year-old female case of herpes simplex encephalitis with a complete recovery. On MR imaging, the white matter lesions, which could be seen in the subacute stage, but not in the acute or chronic stage, might represent edema due to postinfectious neuroallergic phenomena. Proton MR(More)
Proton MR spectroscopic findings in two patients with genetically defined Pelizaeus-Merzbacher disease revealed ratios of N-acetylaspartate/creatine and choline-containing compounds/creatine that were not significantly different from those found in a population of healthy subjects. These findings suggest that proton MR spectroscopy can aid in the diagnosis(More)
Two children with congenital rubella virus and six with cytomegalovirus (CMV) infections, were examined by magnetic resonance (MR) and CT. Cranial MR imaging (MRI) with T2-weighted spin-echo (SE) and inversion recovery (IR) sequences demonstrated the following: periventricular hyperintensity (4), subcortical hyperintensity (5), delayed myelination (4),(More)
PURPOSE To clarify whether there were any differences in MR appearance between the childhood and the adult moyamoya syndromes. METHOD We compared the cranial MR findings in four children under the age of 6 who had moyamoya syndrome with previously documented adult cases. RESULTS Moyamoya syndrome in younger children exhibited a significant increase in(More)