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Biomedical subjects

H Mitsumoto

Publications and source records attributed to H Mitsumoto.

At least 109 records · Page 6Linked to original sources
PubMed1982

Murine motor neuron disease (the wobbler mouse): degeneration and regeneration of the lower motor neuron.

The study of the temporospatial pattern of lower motor neuronal generation in the wr/wr mouse demonstrated that the pathological changes started in the neuronal perikaryon in the spinal cord. Thus the wr/wr mouse suffers from a primary motor neuronopathy. Axonal pathology predominated at the level of the ventral root and suggested a focal proximal axonopathy. Microtubular segregation, neurofilamentous accumulation in the axon, and axonal or adaxonal vacuoles appeared to be closely related to subsequent axonal degeneration. Large myelinated fibres in the cervical ventral roots progressively degenerated and diminished in number with age. On the other hand, significant axonal regeneration coincided, with the axonal degeneration in the cervical ventral roots. A dying-back type of degeneration and axonal atrophy were not present. This study demonstrated that a primary disease of the perikaryon may express itself as a focal proximal axonopathy characterized by axonal degeneration and attempted axonal regeneration.

Animals↗
PubMed1981

Focal EEG abnormalities in Heidenhain's variant of Jakob-Creutzfeldt disease.

Serial EEGs obtained during a six-week period from a patient with Heidenhain's variant of Jakob-Creutzfeldt disease demonstrated periodic complexes confined to the occipital regions that at no time became generalized. The focal character of the discharges correlated with the site of maximal disease in the occipital cortex, suggesting that cortical damage is a necessary substrate for the production of periodic complexes in Jakob-Creutzfeldt disease.

Creutzfeldt-Jakob Syndrome↗
PubMed1981

Adult-onset acid maltase deficiency presenting as diaphragmatic paralysis.

A 51-year-old man presented with a six-year history of gradually progressive exertional dyspnea. His complaint was attributed to increasing age, but evaluation finally led to a diagnosis of diaphragmatic paralysis. Neurological examination disclosed only minimal evidence of weakness of limb muscles. Electromyographic studies suggested a diagnosis of acid maltase deficiency, which was confirmed by electron microscopic and biochemical studies of muscle biopsy sections. Exercise stress testing was necessary to define the limits of the patient's exercise tolerance.

Glucan 1,4-alpha-Glucosidase↗
PubMed1980

Malignant lymphoma of the central nervous system: a case of primary spinal intramedullary involvement.

Primary involvement of the spinal cord in malignant lymphoma is rare. Clinical and pathologic features of a case of malignant lymphoma initially involving the spinal cord and subsequently one cerebral hemisphere are reported and the medical literature reviewed. If malignant lymphoma of the central nervous system is diagnosed by means of brain biopsy examination, radiotherapy of any coexisting intramedullary spinal cord lesion of undetermined cause should be considered.

Biopsy, Needle↗
PubMed1979

McArdle disease: phosphorylase activity in regenerating muscle fibers.

Phosphorylase activity was found histochemically in regenerating muscle fibers in biopsied muscle from a patient with otherwise typical McArdle disease. Phosphorylase activity, shortly after episodes of muscle necrosis, was identified in this patient and in others reported in the literature. Detection of phosphorylase activity accompanied histologic evidence of regenerating muscle fibers and excessive glycogen accumulation. The biopsied muscle had virtually no biochemical enzyme activity. The present study supports a recently introduced hypothesis stating that in McArdle disease there is a lack of "mature" phosphorylase, but skeletal muscle cells are able to manufacture "fetal" phosphorylase isoenzyme during muscle regeneration.

Adult↗
PubMed1975

Paroxysmal "nightmares". Sequel of a stroke responsive to diphenylhydantoin.

A 65-year-old man had nightmares a few weeks after a right temporal lobe infarction. Electroencephalography showed no epileptic activity. Therapy with diphenylhydantoin produced complete remission of his symptoms. On the bases of their acute onset, their association with sleep, their occasional occurrence while the patient was awake, the lack of effect of diazepam and flurazepam, and the good response to diphenylhydantoin, we propose that these episodes were partial seizures secondary to the right temporal lobe lesion.

Aged↗
PubMed1975

Spontaneous infarction in pituitary tumors: neurologic and therapeutic aspects.

In addition to progressive endocrine dysfunction and progressive visual loss, pituitary neoplasms may annouce their presence by the more catastrophic alternative of spontaneous tumor infarction. In two patients reported, illness due to the spontaneous infraction of pituitary tumors was heralded by sudden onset of focal headache associated with diplopia. Stupor, confusion, and evidence of increased intracranial pressure occurred without subarachnoid hemorrhage or massive extrasellar extension of tumor. One patient developed inappropriate antidiuretic hormone secretion with spontaneous infarction in a large but clinically silent chromophobe adenoma. In both patients, skull x-rays suggested a long-standing intrasella mass. Both underwent prompt treatment with endocrinologic replacement therapy and subsequent successful transsphenoidal removal of voluminous, infarcted, pituitary masses.

Adenoma, Chromophobe↗
PubMedDate not supplied

Spontaneous electrical muscle fiber activity in polymyositis and dermatomyositis.

Forty patients with polymyositis or dermatomyositis underwent detailed electromyographic evaluation. The paraspinal muscles of all patients were examined, as were several extremity muscles. The distribution of fibrillation potentials (FPs) in different muscles is discussed. FPs were most frequent in paraspinal muscles. We conclude that, for any patient suspected of having a myopathy, electromyographic examination should include the paraspinal muscles.

Action Potentials↗
PubMedDate not supplied

Perineurioma as the cause of localized hypertrophic neuropathy.

Clinical, electrodiagnostic, and morphological studies were performed on three patients with localized hypertrophic neuropathy (LHN). LHN is characterized clinically by slowly progressive motor mononeuropathy without significant pain or numbness. Nerve conduction studies and needle electrode examination show severe focal motor and sensory axonal loss. Morphological findings in the localized areas of enlarged nerves are different from those of generalized hypertrophic neuropathy, entrapment neuropathy, and neurofibroma, and consist of primary perineurial cell hyperplasia. The tumor is thus a perineurioma. This rare tumor can occur both in generalized neurofibromatosis and in isolated form and appears to be the cause of localized hypertrophic neuropathy.

Adolescent↗