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Biomedical subjects

T Miyamori

Publications and source records attributed to T Miyamori.

12 recordsLinked to original sources
PubMed2001

[Reversible posterior leukoencephalopathy syndrome accompanied by HELLP syndrome and eclampsia: a case report].

We report a case of reversible posterior leukoencephalopathy syndrome accompanied by HELLP syndrome and eclampsia. A 30-year-old woman complained of diminution of visual acuity and eclampsia. Laboratory data revealed hemolysis, elevated liver enzyme and low platelets. CT showed low density areas in the bilateral occipital cortex. T1-weighted images showed a low signal intensity and T2-weighted images showed a high signal intensity in the occipital cortex bilaterally. Magnetic resonance angiography showed stenotic change in the intracranial artery. An operation was performed and significant improvement was seen in her visual function and MRI and MRA returned to normal on a month after operation. The mechanism of a reversible posterior leukoencephalopathy syndrome was discussed.

Adult↗
PubMed1999

Dandy-Walker syndrome successfully treated with cystoperitoneal shunting--case report.

A neonate presented with Dandy-Walker syndrome manifesting as a large posterior cranial fossa cyst, aplasia of the lower cerebellar vermis, and elevation of the confluence of the sinuses but without hydrocephalus. A cystoperitoneal shunt was placed at one month after birth. The cyst diminished in size, and marked development of the cerebellar hemispheres and descent of the confluence of sinuses were observed, but not vermis development. The primary pathology of Dandy-Walker syndrome is posterior cranial fossa cyst formation due to passage obstruction in the fourth ventricle exit area and aplasia of the lower cerebellar vermis. The first choice of treatment in patients with Dandy-Walker syndrome in whom the cerebral aqueduct is open is cystoperitoneal shunt surgery, regardless of the presence or absence of hydrocephalus.

Arachnoid Cysts↗
PubMed1995

Expanded cavum septi pellucidi and cavum vergae associated with behavioral symptoms relieved by a stereotactic procedure: case report.

CASE REPORT: A 6-year-old boy had symptoms such as unstable gait, behavioral symptoms, and irregular appetite, evacuation, and sleep. Giant cavum septi pellucidi and cavum vergae of 3 x 3 x 5 cm were revealed by computed tomography (CT) and magnetic resonance imaging (MRI). After stereotactic cyst-peritoneal shunting, regression of the cavities was revealed by CT and MRI, in association with marked improvement in the above-described symptoms. In the corpus callosum particularly, which had been preoperatively revealed on sagittal MRI sections to be extended circumferentially as a result of compression by a cyst; the compression was relieved postoperatively, and compression of the pericallosal brain tissue was also relieved. CONCLUSIONS: Compression of the brain tissue around the cyst (limbic system, etc.) was considered the most important cause of the behavioral symptoms in this patient.

Brain↗
PubMed1992

Intra-operative screw trimming in direct screw fixation of the odontoid process fracture--technical note.

For a satisfactory direct screw fixation of fractures of the odontoid process it is necessary to use a screw of the proper total length and thread length, but such an optimal ready-made screw is not always available. The authors describe a technique of intra-operative screw trimming using a high-speed diamond drill. This adjustment is easily and quickly performed. It enables the screw to act as a compression screw, which facilitates fusion of the fractured surfaces.

Bone Screws↗
PubMed1992

Direct skull marking for a pre-operative localization in regional cerebral surgery. Technical note.

A method is described in which an open neurosurgical target is pre-operatively marked on the skull of a patient. A target point of the scalp surface localized from neuroimaging studies is transferred onto the skull by an injection of pyoktanin blue. Its accuracy and reliability is far superior than that of the usual scalp marking. The method is simple, practical, and allows a smaller, regional craniotomy with the advantage of minimum operative invasiveness.

Adult↗
PubMed1992

[Fresh fracture of the odontoid process treated with direct screw fixation; a case report].

A case of a fresh type II fracture (Anderson & D'Alonzo) of the odontoid process treated with direct screw fixation is reported. A 52-year-old man complained of severe neck pain following a hit on his forehead incurred in a falling accident. Neurological examination was normal. Cervical spine x-ray films and axial CT scans revealed a fracture at the base of the dens. It was slightly oblique leftup and rightdown, and the dens fragment was displaced 3mm lateral to the right. One week after the injury, this odontoid fracture was directly fixed with a compression screw by an anterior cervical approach. Immediately after the operation, his neck pain disappeared. He had only 4 days of bed rest and 2 months of external immobilization with a simple neck collar. He returned to his previous job 2 months after surgery without any limitation of his neck movement. At follow-up examination 16.5 months after the operation, x-ray films demonstrated complete fusion of the fracture and no problem about the screw such as displacement or breakage. Direct screw fixation of an odontoid fracture via a transcervical approach was thought to be a reasonable method of treatment. For proper assembly of this method, the following two points are particularly recommended: a screw insertion perpendicular to the fracture plane and the use of an optimal screw with both the desired total and thread lengths.

Bone Screws↗
PubMed1991

A micromanipulator for precise control of a brain retractor. Technical note.

A new microsurgical device for delicate brain retraction is described. The device, a micromanipulator with a holder for a brain spatula fixed at the end of a self-retaining retractor arm, allows smooth, steady, fine displacement of the retractor tip ("minimal sliding retraction"), operated by the surgeon's two fingers. This has proved to be a useful and safe method of retraction for critical brain structures such as blood vessels, cranial nerves and aneurysm domes in deep microsurgical fields.

Equipment Design↗
PubMed1990

Intracranial chondrosarcoma--case report.

The authors report the case of a 54-year-old male who was found to have a large intracranial chondrosarcoma at the site from which chondromas had been partially removed twice, 6 and 10 years previously. On the third admission, the second through tenth and the twelfth cranial nerves on the right side were involved. Computed tomographic scans showed a large mass in the right middle and posterior fossae and the right ethmoid sinus. Angiography demonstrated an extradural mass in the right middle fossa. The tumor in the middle and posterior fossae was subtotally removed, and second, third, and eighth cranial nerve function improved postoperatively. Histological examination of tumor specimens showed active proliferation of poorly differentiated cartilagenous cells, suggestive of sarcomatous transformation of the pre-existing chondroma. It is emphasized that chondromas should be removed as completely as possible and that patients must be followed carefully after surgery.

Brain Neoplasms↗
PubMed1988

A new glucose-6-phosphate dehydrogenase variant (G6PD Tsukui) associated with congenital hemolytic anemia.

A new glucose-6-phosphate dehydrogenase (G6PD) variant associated with chronic nonspherocytic hemolytic anemia was found in a 20-year-old Japanese male who showed mild hemolysis after an upper respiratory tract infection. The patient had been noted to have jaundice and reticulocytosis several times before this episode. The enzyme activity of the variant was 1.5% of normal. The enzymatic characteristics were slow anodal electrophoretic mobility, high Km G6P, normal Km NADP, decreased heat stability, and a normal pH optimum. From these results, the enzyme was considered to be a new class 1 variant and was designated G6PD Tsukui.

Adult↗