Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0027627 (metastases)
 103,950 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The potentialities of NMR-tomography in renal cancer patients with symptomatic hypertension were assessed. Altogether 15 patients (9 men and 6 women) aged 24 to 74 were investigated; previously examined 25 persons were entered into the control group. A NMR-tomograph with the magnitude of the magnetic field of 0.235 T using the "spin-echo" method. The results of the investigation were compared with those of the control group and with the results of x-ray computerized tomography, abdominal aortography, dynamic scintigraphy of the kidneys, and ultrasound investigation. NMR-tomography was shown to possess high resolution permitting visualization of a kidney tumor irrespective of its site and its size exceeding 2-3 cm. It also permits obtaining additional data on the state of the kidney parenchyma, cortical and medullary substance, determining the level of ureteral obstruction, and detecting the presence of vertebral metastases.
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PMID:[Magnetic resonance tomography in kidney tumors concomitant with symptomatic hypertension]. 276 69

NMR-tomography is a noninvasive diagnostic alternative to conventional imaging modalities. For clinical purpose there is no significant improvement in staging of kidney tumors and lymphnode metastases. The diagnostic value for complicated cysts and adrenal tumors is superior to all alternative imaging modalities as CT and sonography. Tumors of vena cava could be staged with an accuracy rate of 100%.
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PMID:[The clinical value of NMR tomography for retroperitoneal diagnosis]. 280 71

Clinical, echographic, radiological (CT, NMR), and histopathological findings in a 57-year-old male patient who presented with proptosis of the left eye and diplopia caused by a histologically proven metastasis of a clinically silent small-cell carcinoma of the lung. Echographic problems of the differential diagnosis of orbital metastases are discussed.
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PMID:[Echographic findings in metastization in an extraocular muscle]. 282 18

1-(3'-Chlorophenyl)-3-[2-(3,3-dimethyl-1-azetidinyl)ethyl] imidazolidin-2-one, zetidoline, a new neuroleptic agent, when incubated with rat liver microsomes was rapidly metabolized to six free (mets B, D, I, L, M and N) and two conjugated metabolites (mets E and F). Sites of the metabolic attack (oxidation) were primarily the aromatic moiety, then the imidazolidinone and the azetidine rings. The metabolites were purified and structures assigned by means of EI-MS, 1H-NMR and chemical synthesis (mets B, D, L and M). The main metabolites, zetidoline, some chemical analogues and a few known dopamine antagonists were tested as in vitro inhibitors of 3H-zetidoline and 3H-spiperone binding to rat striatal membranes, and as in vivo inducers of prolactin release in female rats (inhibition of the estrus cycle). Two zetidoline metabolites, namely 4'-hydroxy zetidoline (met. B) and 5-hydroxy zetidoline (met. L), were found to have both in vitro and in vivo activities comparable to those of the parent drug. Identification of these active hydroxylated metabolites appears important both in the search of new leads of neuroleptics and for designing pro-drugs derivatives with improved pharmacokinetic profiles.
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PMID:Zetidoline metabolism by rat liver microsomes. Formation of metabolites with potential neuroleptic activity. 287 40

In evaluating nuclear magnetic tomography for the diagnosis of liver disease, one must differentiate between circumscribed and diffuse lesions. Nuclear magnetic tomography provides additional information for lesions which are echogenic on ultrasound and can differentiate between metastases, haemangiomas and hamartomas. In diffuse parenchymal disease measurement of relaxation time can differentiate between fatty liver, cirrhosis (alcoholic, primary biliary), haemochromatosis (cirrhotic transformation) and hepatoma. NMR spectroscopy is a method for the future.
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PMID:[Differential diagnosis of liver diseases in the nuclear spin tomogram]. 298 31

We examined 21 patients with focal lesions of the liver. Routinely we used T1 weighted, proton weighted and T2 weighted measurement modes, mainly with repetition times of 1.6 sec and echo delay times of 35 or 120 msec. Using these parameters we can see characteristic changes of the signals of the liver tumours. Cystic lesions usually show a strong decrease of the signal in the T1 weighted images in comparison with the normal liver pattern, in the proton weighted images a weak decrease but also in some cases a weak increase of the signal; in the T2 weighted images they show signals of very great intensity. We can differentiate haemangioma of cystic lesions because of the very strong signal in the proton weighted images in comparison with the normal liver pattern, which we could not see in any other focal liver disease. Metastases and hepatoma produced low signal intensity in the T1 weighted image. The proton weighted and the T2 weighted images show signals with a slightly greater intensity compared with the normal pattern, i.e. a very good possibility to distinguish hepatoma and metastases from cystic lesions or haemangioma. The differentiation from hepatoma and metastases cannot be made with NMR up to now. We are also not able to differentiate the focal nodular hyperplasia (FNH) from metastases. We used a 0.35 T supraconductive magnetic system.
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PMID:[Initial experiences with MR in liver tumors]. 299 37

This review includes the initial experience with NMR imaging of the liver, spleen, and pancreas at the University of California, San Francisco, using a prototype 0.35 Tesla system. This experience shows great promise for detection of hepatic metastases using T1-weighted pulse sequences. T2-weighted pulse sequences appear sensitive for detecting cavernous hemangioma of the liver and may allow tissue specific discrimination of the benign lesion from cancer. NMR is also suitable for evaluating diffuse metabolic alterations and is sensitive and specific for the diagnosis of iron overload. Detection of fatty liver requires use of chemical shift techniques as conventional NMR imaging pulse sequences are relatively insensitive. Motion artifacts and lack of an effective bowel contrast agent limits imaging of the pancreas and retroperitoneum, where CT remains the procedure of choice. The normal spleen has longer T1 and T2 relaxation times than liver or pancreas and NMR has not been successful in diagnosing splenic metastases or lymphoma on a routine basis. We conclude that NMR imaging will be valuable in the diagnosis of focal liver disorders; until fast scan techniques and effective magnetic contrast agents are available for oral and/or intravenous use, other abdominal applications will remain limited.
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PMID:Nuclear magnetic resonance of the liver, spleen, and pancreas. 300 15

In collaboration with the Institute of Neurosurgery, La Sapienza Rome University, we have treated 214 patients with stereotactic irradiation. The series began in March 1984 and includes 198 cerebral tumours of different histology and 16 AVM. 73% of the patients had been operated on before irradiation. From this first experience the following considerations can be drawn: (a) radiosurgery is not an alternative to neurosurgery except for particular cases; neurosurgery is therefore essential because the smaller the target area the higher the efficiency of stereotactic irradiation; (b) compared to conventional radiotherapy, damage to the brain is minimized as shown by NMR. The follow-up time is too short to allow any definite conclusion. However, positive effects have been observed in malignant gliomas and single metastases. In craniopharyngiomas and pituitary adenomas, tumour growth was arrested or decreased with the disappearance of the tumour in 3 adenomas and 1 craniopharyngioma. With regard to the response of meningiomas to irradiation we have shown that radiosurgery is able to cause a decrease in tumour size as well as reduced contrast enhancement, probably due to vascular changes and fibrosis. In AVM the efficiency of radiosurgery has been further confirmed.
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PMID:Radiosurgery in cerebral tumours and AVM. 305 30

NMR spectroscopy is one of the few techniques which has the sensitivity to detect subtle changes to the surface chemistry of cells. It has previously been demonstrated that high resolution 1H NMR methods can distinguish tumour cells with the capacity to metastasis and this information appears to arise from a type of proteolipid in or attached to the plasma membrane. Here we report that the 1H NMR signal, which we have used to identify metastatic cells in rat tumours, is significantly reduced in intensity after cultured cells are treated with trypsin/EDTA. The long T2 relaxation value (greater than 350 ms) observed in metastatic cells is absent after enzyme treatment. 2D scalar correlated NMR (COSY) spectra of these treated cells show that a cross peak normally associated with malignancy and metastatic disease is markedly reduced. These findings indicate that the plasma membrane lipid particle which generates the high resolution spectrum is directly affected by trypsin/EDTA. Alterations to the cell surface properties were also demonstrated in vivo since reduced numbers of metastases were observed in animals injected with enzyme-treated cells. The correlation between the absence of a long T2 relaxation value and the diminished numbers of metastases in animals suggests that the plasma membrane particle is involved in the metastatic PROCESS.
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PMID:Cell surface involvement in cancer metastasis: an NMR study. 308 72

Four-dimensional chemical shift imaging was used to map spatial variations in phosphorus metabolites in a patient with carcinoid metastases in the liver. The results were compared to those from an age and sex matched volunteer, with no known previous history of liver disease. In the patient local abnormalities were observed. These included elevated phosphomonoester and decreased phosphodiester concentrations relative to adenosine triphosphate. The regions of abnormality corresponded to regions containing metastases identified with x-ray computed tomography and magnetic resonance imaging.
NMR Biomed 1988 Feb
PMID:Four-dimensional phosphorus-31 chemical shift imaging of carcinoid metastases in the liver. 327 24


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