Biomedical subjects
Publications and source records attributed to Y Menu.
A new system is described for the filtration of routine posteroanterior chest films. The apparatus consists of a sliding support and two filters of different thicknesses and slit widths. The whole equipment, filter and sliding support as described is simple in use, and allows correct centering and a choice of two options of modulation as a function of morphology of patients examined.
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A 39-year-old moderately obese and alcoholic man complained of abdominal pain and nausea. An ultrasound examination of the liver showed large hyperechoic areas surrounding a limited pseudotumorous zone of relatively decreased echogenicity. CT scan showed a decreased density (35 UH) in the hyperechoic areas, suggesting fatty liver which was confirmed histologically; conversely, the hypoechoic area appeared normal on CT scan. Six months later, after reduction of caloric intake and cessation of alcohol ingestion, ultrasound examination and CT scan of the liver were normal.
Findings were compared of examinations in 50 patients not specially prepared and 50 patients placed on a non-residue diet and receiving pre-radiological preparation before barium enemas. Visibility of the pancreas and the global quality of images were improved in patients previously prepared, but not to a sufficient degree to justify its routine use.
A retrospective study was undertaken of abdominal echography in mode B with manual scanning in assessing the spread of 102 carcinomas pf the oesophagus. This showed echography to be reliable in the diagnosis of hepatic metastases (accuracy of method = 93%), ineffective in detecting coeliac lymph node involvement and specific in the recognition of fatty infiltration and steatofibrosis of the liver. However, with regard to hepatic metastases, the existence of false positives and false negatives, even few in number, was such that echography could not influence final decisions as to treatment. The authors feel that histopathological proof in doubtful cases by cytological puncture using a fine needle would avoid false positives and thus give echography its full value.
A retrospective study of 32 cases of acute dissecting aneurysms of the aorta forms the basis for further discussions on the role of arteriography. This is the only examination enabling full visceral investigation in type B dissecting aneurysms (affecting the descending aorta only) treated medically. The possible need for revascularization surgery will depend upon the results of this investigation, the type of arterial lesions affecting the visceral branches being determined by assessment of visibility of arteries in relation to the true and false lumen.
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The authors relate their experiences concerning tomodensitometric examination to evaluate the herniation of a disk. 45 patients and 50 herniations of a disk have been studied. 39 herniations have sustained surgical procedures. The tomodensitometric examination and the radiculosaccography have been performed among these patients in order to compare the findings. The fact that there has only been 3 failures prove the reliability of tomodensitometric examination; among these failure there is 2 post-operative recurrences and one L4 L5 herniation. The radiculosaccography fails 5 times (1 L4 L5 herniation and 4 L5 S1 herniations). There is not any common negative in the two methods. Because of its total innocuity (no injection of any kind) the tomodensitometric examination seems to be the first exploration to prescribe when an herniation of a disk is resistant to clinical treatment and when a surgery is planned.
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PURPOSE: We compared magnetic resonance angiography (MRA) with conventional angiography to establish its value as a screening test in the workup for renal hypertension. METHODS: Twenty-one patients underwent MRA and angiography within a three-day interval. Fifteen patients were suspected of having renovascular hypertension on the basis of clinical findings; the remaining six had multivessel atherosclerosis with renal insufficiency. MRA was performed on a 1 Tesla magnet in three planes: axial, coronal and perpendicular to the axis of each renal artery, by means of several contiguous or overlapping individual slice acquisitions. The two examinations were read by the same two independent observers, before and after an interval of 3 months. RESULTS: Conventional angiography showed 48 renal arteries. All main and three of six accessory renal arteries were correctly identified by MRA, as well as 11 of 14 significant stenoses or thromboses. Overreading of stenoses by MRA was observed in 4 cases. There were two false negatives for the two readers. The sensitivity and specificity of MRA for the detection of stenoses of the main renal arteries were found to be 70 and 78% respectively, for the first reading and 85 and 86% for the second reading. CONCLUSION: MRA is considered a useful noninvasive method to determine the need for conventional angiography in patients in whom renal artery stenosis is suspected.