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Y Shimanuki

Publications and source records attributed to Y Shimanuki.

At least 19 recordsLinked to original sources
PubMed1998

Comparison of ipsilateral activation between right and left handers: a functional MR imaging study.

We used fMRI to compare the ipsilateral activation in the sensorimotor region (SMR) during dominant and non-dominant hand motor tasks between right and left handers. In right handers, the ipsilateral activation was significantly greater during non-dominant (left) hand task than dominant (right) hand task, while in left handers, it showed no significant difference. The ipsilateral activation was most pronounced in the precentral subregion (presumably corresponding to the premotor area) during either hand task in both groups. We conclude that the different patterns of ipsilateral activation might be mainly explained by the hemispheric dominance. The skill of the hand and complexity of tasks may be related to the predominant activation of the premotor area.

Adult↗
PubMed1998

Spontaneous regression of localized neuroblastoma detected by mass screening.

PURPOSE: To clarify whether and when neuroblastomas identified through screening do regress, and to ascertain how to treat them appropriately, we observed screened patients who had localized tumors, without any therapeutic intervention. PATIENTS AND METHODS: The criteria for the observation program were as follows: disease stage I or II; tumor less than 5 cm in diameter; no invasion to the intraspinal canal or growth to the great vessels; urinary vanillylmandelic acid (VMA) and homovanillic acid (HVA) less than 50 microg/mg creatinine; and informed consent. Of 25 patients identified through screening for 6-month-old infants in Saitama Prefecture, Japan between April 1994 and March 1996, 11 patients who met the criteria and one other patient with stage III tumor were enrolled onto the program. They were examined by abdominal ultrasonography (US) and their urinary VMA and HVA levels were assessed approximately once per month. The observation periods ranged from 4 to 27 months. RESULTS: The 11 tumors decreased in size, although one of these 11 tumors initially enlarged until the patient was 12 months of age and decreased in size thereafter. One other tumor slightly increased in size. Urinary VMA levels decreased in all patients. None of the tumors had completely disappeared by the last observation day. CONCLUSION: Our results suggest that regression of screened neuroblastoma is not a rare phenomenon. At present, it seems reasonable to adopt a wait-and-see strategy, with careful observation, for selected stage I or II tumors identified in infants screened at 6 months of age.

Homovanillic Acid↗
PubMed1996

Hypomelanosis of Ito associated with neuroblastoma.

We report a patient with hypomelanosis of Ito associated with neuroblastoma. Though not previously reported, the association is plausible since both conditions are forms of "neurocristopathy".

Adrenal Gland Neoplasms↗
PubMed1996

Clockwise whirlpool sign at color Doppler US: an objective and definite sign of midgut volvulus.

PURPOSE: To evaluate the clockwise whirlpool sign at color Doppler ultrasound (US) in the diagnosis of midgut volvulus. MATERIALS AND METHODS: Pediatric patients (160 boys, 76 girls; age range, 0 day to 14 years) with possible midgut volvulus underwent abdominal gray-scale US and color Doppler US. Midgut volvulus was diagnosed by recognition of the whirlpool sign (wrapping of the superior mesenteric vein and the mesentery around the superior mesenteric artery). If the whirlpool rotated clockwise with caudal movement of the transducer, the direction of the whirlpool was defined as clockwise. RESULTS: Color Doppler US showed a whirlpool sign that was clockwise in 12 of 13 patients with surgically confirmed midgut volvulus and counterclockwise in three patients without midgut volvulus. Sensitivity, specificity, and positive predictive value of clockwise whirlpool sign for midgut volvulus were 92%, 100%, and 100%. CONCLUSION: The clockwise whirlpool sign is diagnostic of midgut volvulus. Color Doppler US should be performed as an initial imaging study in children suspected of having midgut volvulus.

Adolescent↗
PubMed1995

A simple maneuver in follow-up digital subtraction angiography for multiple coronary-aorta bypass grafts.

A simple maneuver in intraarterial digital subtraction angiography (DSA) is proposed to improve the images of left internal thoracic artery bypass grafts (LITAGs). A contrast flush in the left subclavian artery, using a catheter that had been percutaneously introduced from the left brachial artery, was carried out in 14 patients with multiple coronary-aorta bypass grafts (CABGs) after aortic DSA. The side-hole portion of the catheter tip was positioned in the proximal left subclavian artery as the coiled portion remained in the aortic arch. Nonionic contrast medium (350 mg/ml of iodine) was injected with an automatic injector in a volume of 6-8 ml and at a flow rate of 3-4 ml/sec. Left subclavian arterial flush DSA delineated the LITAGs excellently in 11, well in 3, and fairly or poorly in none of the 14 cases. There were no complications in any of these cases. A supplemental contrast flush of the left subclavian artery with a pigtail catheter following aortic DSA improves the diagnosis of multiple CABG patency.

Aged↗
PubMed1995

[Making a backlight display panel using a personal computer and a laser imager: a less expensive and less time-consuming method].

To make a backlight display panel for a scientific exhibit, we used a commercially available laser imager. The MR image was directly transferred from the MR apparatus to a personal computer, and other image information was transferred through an image scanner or digital camera. Text for the presentation was made on the commercially available presentation software Persuasion. It took approximately 10 minutes to print out all the panels needed for one exhibit, and cost only 3,600 Yen (600 Yen a film).

Audiovisual Aids↗
PubMed1994

[MR imaging findings of nonketotic hyperglycinemia. 2 cases of neonatal onset].

We presented MR (magnetic resonance) images findings of the brain in nonketotic hyperglycinemia (NKH) from 2 patients of neonatal onset. MR findings in our cases of NKH are compatible with the pathological alterations described in the literature; MR images revealed delayed myelination of the cerebral white matter and hypoplasia of the corps callosum. The latter finding particularly seemed to be relatively characteristic to NKH. MR examination is the imaging modality of choice for this disease because it can demonstrate the degree of myelination, and development of the corpus callosum particularly on sagittal section.

Brain↗
PubMed1994

[CT and MR imaging findings of sphenoidal masses].

CT and MR imaging findings of 57 sphenoidal masses were retrospectively reviewed to assess the possibility of differential diagnosis between them. Various kinds of masses such as pituitary adenoma, epipharyngeal cancer, mucocele, chordoma, chondroma, chondrosarcoma, distant metastasis, multiple myeloma, fibrous dysplasia, craniopharyngioma, hemangiopericytoma, giant cell tumor, primary sphenoidal cancer, malignant melanoma, leukemia, histiocytosis X, and giant cell tumor were included in this series. CT scanning was performed in all cases, while MR images were obtained in 48 cases using a spin-echo pulse sequence. The relative density of the masses, bony changes and calcification were evaluated on CT, and on MR images, signal intensity of the masses relative to the normal gray matter, contrast enhancement and extension/contour were evaluated. Although no single feature appeared to be specific to the masses, detection of calcification on CT, identification of the normal pituitary gland as deformed or displaced on T1-weighted images, signal intensity on T2-weighted images, and extension of the masses seemed to be useful and should be examined in terms of their ability to assist in differential diagnosis. Finally, accommodative classification of sphenoidal masses primarily based on presumed origin or mode of extension was attempted.

Adolescent↗
PubMed1990

[A case of aortitis syndrome].

A 57 years old woman was admitted for the investigation of anginal chest pain. Her coronary angiography didn't show any typical finding seen in the aortitis syndrome, but coronary sclerosis and stenosis seen in the usual atherosclerotic patients. The cerebral angiography was performed, too. The right vertebral artery, which was tortuous and dilated, was seen, but the other three cerebral vessels were not seen. These rare findings were reported in this report. We added the discussion about the relation between the aortitis syndrome and angina pectoris.

Angina Pectoris↗
PubMed1989

[Diagnosis of aortic arch aneurysm--a case report of the utility of MR imaging].

We reported a case of syphilitic aortic arch aneurysm, which was examined by IADSA, X-ray CT and MR Imaging. A large aneurysm with the thick mural thrombus and central narrow lumen was clearly shown by MR Imaging. MR Imaging is an useful modality for the diagnosis of the aortic arch aneurysm with a very narrow lumen, which cannot be easily pointed out by IADSA.

Aged↗
PubMed1989

[Expanded indication of percutaneous transluminal coronary angioplasty to the infarcted zone--using thallium-201 exercise scintigram after rehabilitation].

In some cases of old myocardial infarction (OMI), left ventricular wall motion was improved after revascularization, though viability of the infarcted myocardium was not detected by left ventriculography (LVG) and exercise thallium-201 myocardial scintigraphy (EX-Tl). So to obtain more correct information of the viability, EX-Tl was performed again after ergometer rehabilitation for an OMI patient whose myocardial viability of the infarcted zone could not detected by LVG and EX-Tl. Incomplete fill in was showed in the EX-Tl after rehabilitation. So percutaneous transluminal coronary angioplasty (PTCA) was performed. Left ventricular wall motion was improved after three months. EX-Tl after rehabilitation is useful to evaluate the viability that could not detected by LVG and EX-Tl.

Angioplasty, Balloon, Coronary↗
PubMed1988

Digital radiography in an intensive care unit.

Mobile chest radiographs obtained in the intensive care unit with a computed radiography system (one of the digital radiography systems) and a conventional screen-film technique were initially compared in 54 pairs. Features such as the air spaces and interstitium of the lungs, the mediastinum, pulmonary vessels, the tracheobronchial tree, and catheters and other devices were compared in both methods. The computed radiography system demonstrated good visualisation of the mediastinum, pulmonary vessels, the tracheobronchial tree, catheters and other devices. Automatic adjustment of the sensitivity and the wide dynamic range of this system were thought to be responsible for the decrease in the number of retakes even in patients with massive fluid collections. The few artefacts created by digital processing were mostly overcome by a routine use of simultaneous display of two different types of image processing.

Aged↗
PubMed1987

[Prognostic significance of pretreatment CT scans in supratentorial astrocytomas receiving radiotherapy].

Pretreatment brain CT scans of 61 patients receiving radiation and chemotherapy for supratentorial gliomas (23 low-grade astrocytomas, 21 grade III astrocytomas and 17 glioblastomas) were reviewed, and their prognoses were analyzed. Almost all gliomas with no CEA (contrast enhanced area) were low-grade, and their prognosis was promising. Benign and malignant gliomas with regular CEA were found in equal proportions, and their prognosis was relatively good. A majority of cases with irregular or ring-like CEA were malignant, and their prognosis was extremely poor.

Adolescent↗
PubMedDate not supplied

MR evaluation of talonavicular angle in congenital talipes equinovarus.

The talonavicular relationship in 14 patients with talipes equinovarus was quantified using gradient echo sequences. The angle formed between the short axis of the navicular and the long axis of the talus was measured. There is a significant difference in the talonavicular angle between patients who had posteromedial release (PMR) and those who had posterior release (PR) or casting only (P=.0004). This method provides an objective assessment of residual deformity following surgical and conservative management of talipes equinovarus.

Analysis of Variance↗