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Contrast enhancement visualized by computerized tomography in acute multiple sclerosis.

L Weisberg
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Acute DiseaseAdrenal Cortex HormonesAdultCerebral VentriculographyContrast MediaElectroencephalographyFollow-Up StudiesHumansMiddle AgedMultiple SclerosisRadiographic Image EnhancementTomography, X-Ray ComputedJournal Article

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L Weisberg. Contrast enhancement visualized by computerized tomography in acute multiple sclerosis.. https://doi.org/10.1016/0363-8235(81)90036-3

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The escape of the prosthetic heart valve disc is one of the causes of prosthetic dysfunction that requires emergency surgery. The removal of the embolized disc should be carried out because of the risk of a progressive extrusion on the aortic wall. Several imaging techniques can be used for the detection of the missing disc localization. In this report we describe a 32-year-old man who underwent mitral valve replacement with a Tri-technologies bileaflet valve three years ago, and was admitted in cardiogenic shock. Transesophageal echocardiography showed acute-onset massive mitral regurgitation. The patient underwent emergency replacement of the prosthetic valve. Only one of the two leaflets remained in the removed prosthetic valve. The missing leaflet could not be found within the cardiac cavity. The abdominal fluoroscopic study and plain radiography were unable to detect the escaped leaflet. The abdominal computed tomography scan and the ultrasound showed the escaped leaflet in the terminal portion of the aortic bifurcation. To retrieve the embolized disc laparotomy and aortotomy were performed three months later. The escaped leaflet shows a fracture of one of the pivot systems caused by structural failure. This kind of failure mode is usually the result of high stress concentration.

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