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Biomedical subjects

A Uchino

Publications and source records attributed to A Uchino.

At least 19 recordsLinked to original sources
PubMed1995

Double cerebral venous angiomas: MRI.

Using a 1.5 Tesla MR imager, we examined 58 patients with venous angiomas (VA); images were also obtained following contrast medium in 33. Of the 58 patients 29 underwent selective cerebral angiography. We found in all 63 VA, including two with arterial components; 5 of the 58 patients thus each had two VA. The VA were supratentorial and bilateral in 4 cases; the remaining patient had supra- and infratentorial VA. Of these 5 patients, 4 received intravenous contrast medium and in 2 of them, the second VA was so small that it was detectable only on the contrast-enhanced images. The incidence of double VA in patients receiving contrast medium was 12% (4/33).

Adolescent↗
PubMed1995

Intracranial epidermoid carcinoma: CT and MRI.

We report a patient with an epidermoid carcinoma an extremely rare brain tumour, in the right cerebellopontine angle cistern. Contrast enhancement is the most important feature for differential diagnosis of epidermoid carcinomas from atypical benign epidermoid cysts.

Brain↗
PubMed1995

[High flow priapism following a straddle-injury-induced arteriocavernosal fistula: a case report].

A 26-year-old man with high flow priapism after blunt perineal trauma, is described herein. Patient evaluation included intracavernal blood-gasometry, cavernography, color flow Doppler sonography. The blood-gasometry showed pH 7.413, pO2 77.9 mmHg, pCO2 41.0 mmHg, HCO2- 26.1 mmol/L, BE 2.0 mmol/L. By direct cavernosography, pooling of contrast agent was seen at the root of the penis. Color flow Doppler sonography revealed pulsatile, turbulent flow within left corpus cavernosum. Our case was diagnosed as high flow priapism from these findings. Detumescence was not achieved by an alpha-adrenergic agent. Superselective embolization of the deep artery of the penis with autologous blood clot was performed with good results. Our case demonstrates that this procedure is a safe and effective therapy for high flow priapism and that erectile function can return to normal.

Adult↗
PubMed1994

MRI of the brain in chronic carbon monoxide poisoning.

We examined 13 patients with chronic carbon monoxide (CO) poisoning by magnetic resonance imaging (MRI); all of them had been in an explosion in a coal mine 25 years previously. Symmetrical globus pallidus lesions were observed in 12, as was degeneration of the white matter, with focal cortical atrophy. The temporal parietal and occipital lobes were usually affected, the parietooccipital region being the most frequently and extensively damaged. Of the 12 patients with white matter degeneration 7 had definitely asymmetrical cortical and subcortical lesions. There were 6 patients with dilated temporal horns, probably due to atrophy of the hippocampal gyri. A history of CO inhalation and an awareness of the typical distributions of lesions are important for recognition of the effects of CO poisoning, especially when patients are in the chronic stage.

Accidents, Occupational↗
PubMed1992

[MR imaging of pericallosal lipomas].

Eight cases of pericallosal lipomas were studied by MR imaging at 1.5 Tesla. All were located around the splenium of the corpus callosum, and were classified as the curvilinear type. Corpus callosal abnormalities were detected in the six of these eight cases, and included two cases of short corpus callosum and four of thin splenium. The larger lipomas tended to have greater abnormalities of the corpus callosum. T1-weighted sagittal images were the most useful pulse sequences for diagnosing pericallosal lipomas and corpus callosal abnormalities. On review of the literature we found that the curvilinear type of pericallosal lipoma is more frequently observed by MR imaging than the tubulonodular type.

Adolescent↗
PubMed1992

[MR imaging of stereotactic thalamotomy using radiofrequency methods].

Sixty-eight stereotactic radiofrequency (rf) thalamic lesions in 57 patients with movement disorders were evaluated by magnetic resonance (MR) imaging. Postoperative periods ranged from 5 days to 4 years and 9 months. All 68 rf lesions were clearly detected on T2-weighted images (T2WI). Changes in signal intensity on T2WI were classified into five patterns, as follows: Pattern I: lesions with three concentric zones consisting of an inner hypointense, middle hyperintense and outer hypointense zone (31 lesions); Pattern II: lesions consisting of an inner hypointense and outer hyperintense zone (4 lesions); Pattern III: lesions consisting of an inner hyperintense and outer hypointense zone (27 lesion); Pattern IV: lesions of a hyperintense area alone (2 lesions); Pattern V: lesions of a hypointense area alone (4 lesions). The outer hypointense rim in Patterns I and III is thought to represent hemosiderin deposition. The abnormal signal intensity on T2WI caused by rf ranged from 2 to 12 mm in diameter, and lesions in the late phase were smaller than lesions in the early phase.

Adolescent↗
PubMed1992

[MR imaging of intraocular lesions--a comparison with CT].

Thirty-two intraocular lesions were studied with magnetic resonance (MR) imaging and computed tomography (CT). These lesions included retinoblastoma (n = 11), uveal melanoma (n = 6), metastatic choroidal tumor (n = 3), choroidal hemangioma (n = 2), retinochoroiditis (n = 6) and Coats' disease (n = 4). MR imaging was superior to CT in the depiction of intraocular masses and retinal detachment. Gd-DTPA enhanced MR imaging was more useful than contrast enhanced CT in evaluating the contrast enhancement of intraocular tumors. Differential diagnosis of intraocular tumors was difficult with both MR imaging and CT. Intratumoral calcification was noticed on CT in nine cases of retinoblastoma. It was concluded that MR imaging, including contrast enhancement study, is more useful than CT in the evaluation of intraocular lesions, except for calcification, and contrast enhanced CT may be unnecessary in the diagnosis of intraocular lesions.

Eye Diseases↗
PubMed1992

MR imaging and angiography of cerebral venous angiomas associated with brain tumors.

MR study of 6 patients with concurrent venous angioma and brain tumor revealed that in 2 of the 6 cases, the draining vein of the venous angioma was located near to the tumor and was displaced by the tumor. Two of the 6 venous angiomas were too small to visualize prior to contrast enhancement, but could be detected following administration of Gd-DTPA. Angiography was required for definitive diagnosis of the venous angiomas. When a venous angioma is suspected or is detected incidentally, especially when very near a brain tumor, angiography should be considered before performing surgery to avoid surgical complications. Otherwise, ligation of the vein draining the venous angioma may lead to venous infarction.

Adolescent↗
PubMed1991

[MR imaging of pontine infarction within 2 weeks after ictus].

Magnetic resonance (MR) images of 10 patients with pontine infarction were reviewed. A total of 17 examinations were performed on a 1.5 Tesla high-field scanner (GE) within two weeks after ictus. The infarcted area was detected by MR as early as 20 hours after stroke in one case. However, MR images obtained in two cases three and nine hours after onset were unremarkable. It is therefore suggested that follow-up study should be performed when initial MR images within 20 hours postictus are normal. T1-weighted images at four, nine and twelve days after ictus were interpreted as normal. In two of these three examinations, the infarcted areas were clearly demonstrated as hyperintense lesions on T2-weighted images. In the other examination, however, an area of mildly increased signal intensity was seen on T2-weighted images. This case suggests that the fogging effect is also observed on MR imaging and that a small pontine infarction may be overlooked during the subacute stage. Basilar artery occlusion was detected as an absence-of-flow void in three of the ten patients. In conclusion, MR imaging proved to be a relatively useful diagnostic modality for evaluating acute and subacute pontine infarctions.

Acute Disease↗
PubMed1991

[MR imaging of medullary infarction].

Magnetic resonance (MR) images of 20 patients with medullary infarction have been reviewed. All patients were imaged on a 1.5 Tesla high-field scanner (GE, Signa). Clinical diagnoses of these 20 patients were Wallenberg's syndrome (15), cerebellar infarct (3), right hemiparesis (1), and multiple cerebral infarcts (1). Locations of infarct were right lateral (8), right postero-lateral (2), left lateral (5), left postero-lateral (4) and left anterior (1). Associated ipsilateral cerebellar infarcts were observed in six patients. Ipsilateral vertebral artery (VA) occlusions were detected in six patients, and VA aneurysm in two. Thus, MR imaging is a pertinent diagnostic modality for evaluating medullary infarction and associated vascular diseases.

Adult↗
PubMed1991

Thickened fatty filum terminale: MR imaging.

MR images of four patients with a thickened filum terminale showing a fat signal are presented. There were no related symptoms and no evidence of tethering. The thickened fatty filum terminale seemed to be a developmental anomaly and without clinical significance. As the incidence of this anomaly was 0.24% in our series, knowledge of its possible presence of this anomaly is important for routine reviews of MR image.

Adipose Tissue↗
PubMed1991

Serial MR imaging in Creutzfeldt-Jakob disease.

Serial magnetic resonance (MR) imagings of two autopsied patients with Creutzfeldt-Jakob disease (CJD) are presented. Both patients showed a dramatic progression of brain atrophy. The initial MR imagings were, however, interpreted as normal except for localized mild cortical atrophy in one patient. When a normal MR image is obtained in a demented middle-aged or aged patient, CJD may still need to be ruled out: follow up MR imaging may be useful.

Aged↗
PubMed1991

Local complications in transbrachial cerebral angiography using the 4-F catheter.

Local complications of cerebral angiography using the transbrachial technique were assessed. In 333 patients with cerebrovascular disease 342 catheterizations using a sheathless 4-F catheter were attempted, with 337 successes (98.5%). There were two major and five minor complications (2.1%). A massive hematoma and a pulse deficit were overcome without sequelae. The overall complication incidence was significantly higher in females (5.7%) than in males (0.4%). This procedure requires extra care in female patients.

Adolescent↗
PubMed1990

MR imaging of wallerian degeneration in the human brain stem after ictus.

Magnetic resonance (MR) imaging of wallerian degeneration in the brain stem was studied in 30 hemiplegic patients within 12 months of ictus. As early as 25 days after the ictus, decreased signal intensities on proton-density(PD)-weighted images were observed in the brain stem ipsilaterally. This hypointensity gradually approached an isointense stage during 70-80 days after the ictus, abnormal intensities were not detected in any pulse sequence. We termed this phenomenon "Fogging effect of wallerian degeneration". In later stages, at least 81 days after the ictus, increased signal intensities on T2-weighted images, with or without decreased signal intensities on T1-weighted images, were observed in the brain stem, ipsilaterally. Finally, at least six months after the ictus, mild shrinkage of the ipsilateral brain stem was newly detected on the T1-weighted images. MR imaging has proven to be a sensitive diagnostic modality for evaluating wallerian degeneration in the brain stem.

Brain Stem↗
PubMed1990

[Repetitive rhythmic spikes in epileptic children].

Repetitive rhythmic spikes (RRSs') sometimes appear periodically for 0.2-2.0 seconds at localized in epileptic children. We selected 11 patients (male 6, female 5) with RRSs for this study. Ages were 3-15 years (average 10.7 years). We counted the number of spikes which were recorded on the scalp EEG. The duration of RRSs and the differences of amplitude between large and small spikes on monopolar montages were examined. We also studied the appearance of spikes under different recording conditions; waking and sleep stages, photic stimulation and hyperventilation. Furthermore, we made two dimensional joint-dot plotting for the interval between repetitive spikes. RRSs were classified into two groups. In the first group, joint-dots of RRSs were locally observed between 0.2-0.8 sec. In the second, they were disseminated between 0.2-2.0 sec. In two groups, spikes were mainly observed in the sleep EEG (stage 1). The average number of spikes in the first group was 18.7/min, and that in the second was 25.7/min. The average difference of the amplitude between large and small spikes was 103 microV in the first group, and 88 microV in the second group. The average duration of spikes was 54.2 msec in the first group and 62.4 msec in the second group. From these results, it was assumed that some of spikes in the first group occurred in the surface of the cortex and that some of spikes in the second group were projected from the deep region in the cortex.

Adolescent↗