RESUMEN
Technical aspects of 3D contrast-enhanced magnetic resonance angiography are exposed, detailing more particularly the pulse sequence used and the mode of injection of contrast agent. Then, various vascular territories are analyzed, and illustrated using various examples of main pathologies observed in routine clinical practice: abdominal aorta, renal arteries, pelvic and mesenteric vessels, and peripheral arteries.
Asunto(s)
Aorta Abdominal , Enfermedades de la Aorta/diagnóstico , Angiografía por Resonancia Magnética , Aneurisma/diagnóstico , Disección Aórtica/diagnóstico , Aorta Abdominal/cirugía , Aneurisma de la Aorta Abdominal/diagnóstico , Aortitis/diagnóstico , Arteriopatías Oclusivas/diagnóstico , Prótesis Vascular , Gadolinio , Humanos , Arteria Ilíaca/cirugía , Pierna/irrigación sanguínea , Síndrome de Leriche/diagnóstico , Trasplante de Hígado , Oclusión Vascular Mesentérica/diagnóstico , Neoplasias Pélvicas/diagnóstico , Obstrucción de la Arteria Renal/diagnóstico , Arteritis de Takayasu/diagnósticoRESUMEN
PURPOSE: The authors evaluated the ability of an aortic balloon-expandable endovascular stent-graft to prevent rupture in a model of spontaneously rupturing abdominal aortic aneurysms in sheep. MATERIALS AND METHODS: Aneurysms were created in 16 sheep by inserting a 60 x 18-mm segment of the left internal jugular vein, end-to-end anastomosed, to the sectioned infrarenal abdominal aorta. The sheep were randomly assigned into two groups; eight animals underwent endovascular implantation of an 80 x 12-mm balloon expandable stent-graft (group A), and eight were only followed up (group B). RESULTS: In group B, seven of eight animals had died of aneurysmal rupture by 3 months. In group A, six of the eight aortic aneurysms were immediately excluded, and six animals were alive at 3 months without rupture. The 3-month survival rate was 100% in group A and 12% in group B (P = .0023). Macro- and microscopic analysis of the section of the aorta in which the stent-graft had been placed revealed rapid retraction of the aneurysmal sac. CONCLUSION: Placement of an endovascular stent-graft induced regression of a branchless aneurysm and prevented rupture.
Asunto(s)
Aneurisma de la Aorta Abdominal/terapia , Rotura de la Aorta/prevención & control , Stents , Animales , Aneurisma de la Aorta Abdominal/mortalidad , Rotura de la Aorta/mortalidad , Diseño de Equipo , Estudios de Seguimiento , Tereftalatos Polietilenos , Ovinos , Acero Inoxidable , Tasa de Supervivencia , Factores de TiempoRESUMEN
A prospective study was conducted in 23 patients to evaluate magnetic resonance imaging versus computed tomography and plain film radiography for the early detection of sacroiliitis in patients with spondylarthropathy and an Amor score of less than 6. Computed tomography was significantly better than the other two techniques despite some false-positive results, particularly in patients older than 40 years. Magnetic resonance imaging lacked sensitivity for detecting elementary lesions, particularly of the cartilage, but demonstrated clearly that the earliest abnormality was edema of the subchondral bone.
Asunto(s)
Reacciones Antígeno-Anticuerpo , Artritis/complicaciones , Artritis/diagnóstico , Imagen por Resonancia Magnética , Articulación Sacroiliaca , Enfermedades de la Columna Vertebral/complicaciones , Enfermedades de la Columna Vertebral/inmunología , Adulto , Artrografía , Estudios de Evaluación como Asunto , Femenino , Humanos , Masculino , Persona de Mediana Edad , Sensibilidad y Especificidad , Tomografía Computarizada por Rayos XRESUMEN
OBJECTIVE: Twenty-four patients with intrapancreatic metastases were retrospectively studied to identify diagnostic criteria on cross-sectional imaging. MATERIALS AND METHODS: Ultrasound and CT of the pancreas were reexamined by two radiologists who specified morphologic patterns. RESULTS: Metastases of the pancreas were found more often solitary (14 cases) than multiple (10 cases) and as homogeneous nodules hypoechoic on US (15 cases), hypodense on CT (11 cases), sometimes hypervascular (6 cases) or pseudocystic (4 cases). Dynamic contrast-enhanced CT demonstrated small lesions 10 mm in diameter (three cases), not seen on US, and was highly suggestive when it showed several nodules in the gland. We identified some other criteria of intrapancreatic metastatic disease: two or more locations in the pancreas, nonobliteration of the retropancreatic fat regardless of the size of the lesion, nondilated biliary tree in the case of a large tumor of the pancreatic head, and a hypervascular mass without endocrine syndrome. Percutaneous puncture assessed the diagnosis (10 cases) and differentiated metastases from a primary ductal adenocarcinoma of the pancreas. CONCLUSION: Detection and identification of suggestive features of pancreatic metastases may be obtained by examination of the pancreas with dynamic CT.