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  • 1
    Electronic Resource
    Electronic Resource
    Tectonothermal evolution of the Lesser Himalaya, Nepal: Constraints from 40Ar/39Ar ages from the Kathmandu Nappe (1997)
    Oxford, UK : Blackwell Publishing Ltd
    The @island arc 6 (1997), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract The Himalaya is a fold-and-thrust wedge formed along the northern margin of the Indian continent, and consists of three thrust-bounded lithotectonic units; the Sub-Himalaya, the Lesser Himalaya, and the Higher Himalaya with the overlying Tethys Himalaya from south to north, respectively. The orogen-scale, intracrustal thrusts which bound the above lithotectonic units are splays off an underlying subhorizontal dkcollement, and show a southward propagating piggy-back sequence with an out-of-sequence thrust. Among these thrusts, the Main Central Thrust zone (MCT zone) has played a major role in Himalayan tectonics. The MCT zone represents a shear zone which has accommodated southward thrusting of the Higher Himalayan crystalline thrust sheet over the Lesser Himalayan sequence for ∼140 km. The Kathmandu Nappe in central Nepal has been transported over the Lesser Himalayan metasediments along the MCT zone, and is locally separated from the Higher Himalayan thrust sheet in the north by an out-of-sequence thrust. 40Ar/39Ar ages have been determined for one whole-rock phyllite and six muscovite concentrates from metasedimenta-ry rocks and variably deformed granites in the Kathmandu Nappe. These ages range from 44 Ma to 14 Ma, and suggest a record of both Eo-Himalayan (Eocene) and Neo-Himalayan (Miocene) tectonothermal events in the Tertiary Himalayan orogeny. The Miocene event was associated with translation along the MCT zone. No tectonothermal event of the Late Miocene to Early Pliocene ages have been reported near the MCT zone in southern Lesser Himalayan crystalline nappe or klippe, although such events have been documented within and around the MCT zone in the northern root zone of the Higher Himalaya. This suggests that out-of-sequence thrusting may have occurred between 14 Ma and 5 Ma, probably during the period 10-7.5 Ma. Since then the frontal MCT zone below the Kathmandu Nappe has been inactive, but the MCT zone in the northern root zone has remained active. The rapid increase in denudation rates of the Higher Himalaya since the Late Miocene may have been caused by ramping along the out-of-sequence thrust at depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.1997.tb00047.x
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  • 2
    Electronic Resource
    Electronic Resource
    Early exhumation of the collisional orogen and concurrent infill of foredeep basins in the Miocene Eurasian–Okhotsk Plate boundary, central Hokkaido, Japan: Inferences from K–Ar dating of granitoid clasts (2004)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 13 (2004), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  Thick Middle (–Upper) Miocene turbiditic deposits filled very deep and narrow foredeep basins formed in the western margin of the Hidaka collision zone in central Hokkaido. Cobble- to boulder-sized clasts of eight monzogranites and a single granodiorite in the Kawabata Formation in the Yubari Mountains area yielded biotite K–Ar ages of 44.4 ± 1.0 to 45.4 ± 1.0 Ma and 42.8 ± 1.1 Ma, respectively. Major elemental compositions of the clasts all fall in the field of S-type granite on an NK/A (Na2O + K2O/Al2O3 in molecule) versus A/CNK (Al2O3/CaO + Na2O + K2O in molecule) diagram, verifying their peraluminous granite character (aluminium saturation index (ASI): 1.12–1.19). These geochronological and petrographical features indicate that the granitoid clasts in the Kawabata Formation correlate with Eocene granitic plutons in the northeastern Hidaka Belt, specifically the Uttsudake (43 Ma) and Monbetsu (42 Ma) plutons. Foredeep basins are flexural depressions developed at the frontal side of thickened thrust wedges. The results presented here suggest that deposition of the Middle Miocene turbidites was coeval with rapid westward up-thrusting and exhumation of the Hidaka Belt. This early mountain building may have occurred in response to thrusting in the Tertiary fold-and-thrust system of central Hokkaido.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2004.00431.x
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  • 3
    Electronic Resource
    Electronic Resource
    Cavernous sinus meningioma presenting as orbital apex syndrome. Diagnostic methods of dynamic MRI, spoiled GRASS (SPGR) image (1995)
    Springer
    Neurosurgical review 18 (1995), S. 277-280 
    Details
    ISSN: 1437-2320
    Keywords: Cavernous sinus tumor ; dynamic MRI ; meningioma ; MRI ; spoiled GRASS (SPGR) image
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Orbital apex syndrome is a symptomatologic complex. In this paper, the usefulness of several clinical diagnostic MR methods in preparing for surgery is discussed. These include dynamic MRI and the spoiled GRASS (SPGR) image for a cavernous sinus meningioma presenting with orbital apex syndrome. A 53 year old man, who had right cavernous sinus tumor presenting with orbital apex syndrome, was examined by several new MRI techniques. The tumor was partially removed and fibroblastic meningioma was confirmed pathologically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383881
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  • 4
    Electronic Resource
    Electronic Resource
    Vasospasm after traumatic subarachnoid haemorrhage: Transcranial Doppler evaluation. Case report (1991)
    Springer
    Neurosurgical review 14 (1991), S. 321-325 
    Details
    ISSN: 1437-2320
    Keywords: Transcranial Doppler ; traumatic subarachnoid haemorrhage ; vasospasm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of vasospasm after traumatic subarachnoid haemorrhage (SAH) is reported here. Transcranial Doppler Sonography (TCD) was used to evaluate mean flow velocity (MFV) changes of the basal cerebral arteries related to vasospasm. Accelleration of MFV of the right middle cerebral artery (MCA) indicating vasospasm was first noted on TCD evaluation, and then proved by carotid angiography (CAG). Evaluation of all TCD results revealed that the process of relaxation or normalization of the spastic artery started from the proximal side of the basal intracranial artery and gradually moving to the distal side. This interesting phenomenon could be a common process found in vasospasm cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383273
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  • 5
    Electronic Resource
    Electronic Resource
    Demonstration of the venous systems with Gadolinium-enhanced three-dimensional phase-contrast MR venography (1995)
    Springer
    Neurosurgical review 18 (1995), S. 101-107 
    Details
    ISSN: 1437-2320
    Keywords: Gadolinium-enhanced MRA ; MRA ; MR venography ; phase-contrast (PC) MRA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this study was to evaluate the usefulness and advantages of gadolinium-enhanced three-dimensional phase-contrast MR venography for demonstrating the venous systems. The three-dimensional phase-contrast MR venography was performed with a velocity encoding gradient settings from 5 to 20 cm/s on 22 normal subjects. In 8 of normal subjects, gadolinium-enhanced phase-contrast MR venography was performed. 22 subjects (100%) had detectable flow in the sphenoparietal sinus, transverse sinus, basal vein, and internal cerebral vein. With a VENC setting at 10 cm/s, venous system was visualized selectively and clearly. Detection ratio in inferior petrosal sinus, superior petrosal sinus, and superior ophthalmic vein increased from 0% to 25%, from 28.6% to 62.5%, and from 28.6% to 37.5%, respectively, after administration of gadopentate dimeglumine. In conclusion, gadolinium-enhanced three-dimensional phase-contrast MR venography was useful for demonstrating the venous systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417666
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  • 6
    Electronic Resource
    Electronic Resource
    Diagnosis of carotid-cavernous fistulas with magnetic resonance angiography—demonstrating the draining veins utilizing 3-D time-of-flight and 3-D phase-contrast techniques (1996)
    Springer
    Neurosurgical review 19 (1996), S. 7-12 
    Details
    ISSN: 1437-2320
    Keywords: Arteriovenous malformation ; carotid-cavernous fistuaa ; phase-contrast magnetic resonance angiography ; time-of-flight magnetic resonance angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study assessed the ability to diagnose carotid-cavernous fistulas (CCFs) non-invasively using magnetic resonance angiogrphy (MRA). Both three-dimensional time-of-flight (3-D TOF) MRA and three-dimensional phase-contrast (3-D PC) MRA were compared with conventional cerebral angiography in nine patients with CCFs. CCFs were grouped according to Barrow's classification. In all cases, 3-D TOF MRA revealed an inferior petrosal sinus as a draining vein. 3-D PC MRA demonstrated a dilated and tortuous superior ophthalmic vein (SOV) and reflux of the SOV in seven patients. In conclusion, CCFs can be diagnosed with MRA alone by demonstrating the drainging veins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346602
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  • 7
    Electronic Resource
    Electronic Resource
    Incidence of intracranial aneurysm associated with pituitary adenoma (1997)
    Springer
    Neurosurgical review 20 (1997), S. 13-17 
    Details
    ISSN: 1437-2320
    Keywords: Aneurym ; association ; incidence ; pituitary adenoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The incidence of in tracranial aneurysm associated with pituitary adenoma is not definitely established although reported higher than in general population. This study was designed to find the existence of such association in a large series of pituitary adenoma cases. A retrospective study of 467 cases of pituitary adenoma (mean age: 41 ± 15 years) was done. All patients underwent cerebral angiography at least of anterior circulation, detailed hormonal study, and 155 cases had additional magnetic resonance (MR) angiography. Twenty-five cases (5.4%) of pituitary adenoma (mean age 52 years) had intracranial aneurysm, 97% on anterior circulation, and 12% had multiple aneurysms. Two cases presented with aneurysmal rupture and the rest were incidental. Aneurysm was more frequently seen with increasing age (p 〈 0.001) and the age distribution resembled that of aneurysm among general population. Although the combination was most frequent among nonfuctioning adenoma (8.8%), and least frequent among prolactinoma (2.4%), this association was again due to age factor. There was no association between hormone secretion, size and invasive nature of the tumor. The results showed no association between intracranial aneurysm and pituitary adenoma. Our speculation is that such occurrence is merely a chance factor and the risk is no greater than that among general population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390519
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  • 8
    Electronic Resource
    Electronic Resource
    Usefulness of two-dimensional time-of-flight MR angiography combined with surface anatomy scanning for convexity lesions (1997)
    Springer
    Neurosurgical review 20 (1997), S. 108-113 
    Details
    ISSN: 1437-2320
    Keywords: Convexity lesion ; surface anatomy scanning ; time-of-flight ; usefulness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Thirty-eight patients with convexity lesions were studied prospectively with the two-dimensional time-of-flight (2D-TOF) magnetic resonance angiography (MRA) method. Of these 21 cases had additional surface anatomy scanning (SAS) and 7 cases had three-dimensional phase contrast (3D-PC) MRA. The findings were compared during surgery, and the predictability of 2D-TOF evaluated. 2D-TOF was obtained with 2 mm slice thickness after the administration of contrast media for routine magnetic resonance imaging (MRI). Cortical veins were visualized with a good resolution with a scan time of only 5 minutes. The tumor was also visible in the background, due to enhancement, and thus the tumor-vessels relation was shown. Slow-flow vessels were also adequately seen. SAS was done at the same sitting with fast spin echo (FSE) with a scan time of 3 minutes. Once both images were incorporated, information on gyri and their relation to the lesions and vasculature could be obtained from a single image. We found 2D-TOF alone, or at times in combination with SAS, useful for planning of operation for convexity lesions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01138193
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  • 9
    Electronic Resource
    Electronic Resource
    Brain metastasis of Merkel cell carcinoma (1999)
    Springer
    Neurosurgical review 22 (1999), S. 54-57 
    Details
    ISSN: 1437-2320
    Keywords: Key words Brain tumor ; Merkel cell carcinoma ; Metastasis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Merkel cell carcinoma (MCC) is a rare primary cutaneous neuroendocrine tumor that is locally aggressive and has potential for metastatic spread. However, brain metastases are rare, and therapy for such tumors has never reported. The authors present a 48-year-old woman with MCC of the left elbow and a right cerebellar metastasis. After the right cerebellar mass was totally resected, radiation treatment and chemotherapy were performed. Eight cases of brain metastasis have been reported in the literature, but only 5 have been presented in sufficient detail for analysis. Therapy for brain metastases has always been palliative whole-brain irradiation and chemotherapy except for our patient, who underwent total removal of the tumor and survived for 11 months without neurological deficit. Except in the case of 1 with a particularly radiosensitive MCC, the patients with brain metastases died within 9 months after detection of the brain lesions. If possible, aggressive excision of brain metastases as well as of the primary lesion should be done.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101430050010
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  • 10
    Electronic Resource
    Electronic Resource
    Usefulness of three-dimensional phase contrast MR angiography on arteriovenous malformations (1997)
    Springer
    Neurosurgical review 20 (1997), S. 171-176 
    Details
    ISSN: 1437-2320
    Keywords: Arteriovenous malformations ; MR angiography ; phase contrast ; usefulness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Prospective three-dimensional phase contrast (3D-PC) MR angiography was obtained in 34 patients with arteriovenous malformations (AVM) and comparison was made between digital substraction angiography (DSA) and three-dimensional time-of-flight (3D-TOF) methods. Velocity encoding (VENC) for 3D-PC was adjusted to 60 and 10 cm/sec., and was changed only when adequate information was not obtained. VENC 60 cm/sec. demonstrated the main feeders in 100 % of cases and the nidus in 86 % of cases whereas VENC 10 cm/sec. showed the draining vein in 78 % of cases. The detection rate of feeder, nidus and drainer was 60 %, 40 % and 13 % respectively by the TOF technique. The mean size of the nidus as compared with DSA as standard was 130 % with MRI,108 % with 3D-PC and 92 % with the TOF technique and this difference was not statistically significant. 3D-PC was clearly superior in detecting AVM in the presence of hemosiderin, hematoma or surgical clips. It also showed gradual disappearance of the lesion after radiosurgery We found 3D-PC superior to 3D-TOF in the diagnosis, therapeutic planning and follow-up of AVM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01105560
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