Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 12 de 12
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Radiographics ; 42(4): 1145-1160, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35622491

RESUMO

Extraskeletal Ewing sarcoma (EES) is a rare subtype in the Ewing sarcoma family of tumors (ESFT), which also includes Ewing sarcoma of bone (ESB) and, more recently, primitive neuroectodermal tumors. Although these tumors often have different manifestations, they are grouped on the basis of common genetic translocation and diagnosis from specific molecular and immunohistochemical features. While the large majority of ESFT cases occur in children and in bones, approximately 25% originate outside the skeleton as EES. Importantly, in the adult population these extraskeletal tumors are more common than ESB. Imaging findings of EES tumors are generally nonspecific, with some variation based on location and the tissues involved. A large tumor with central necrosis that does not cross the midline is typical. Despite often nonspecific findings, imaging plays an important role in the evaluation and management of ESFT, with MRI frequently the preferred imaging modality for primary tumor assessment and local staging. Chest CT and fluorine 18 fluorodeoxyglucose PET/CT are most sensitive for detecting lung and other distant or nodal metastases. Management often involves chemotherapy with local surgical excision, when possible. A multidisciplinary treatment approach should be used given the propensity for large tumor size and local invasion, which can make resection difficult. Despite limited data, outcomes are similar to those of other ESFT cases, with 5-year survival exceeding 80%. However, with metastatic disease, the long-term prognosis is poor. ©RSNA, 2022.


Assuntos
Neoplasias Ósseas , Tumores Neuroectodérmicos Primitivos , Sarcoma de Ewing , Adulto , Neoplasias Ósseas/diagnóstico por imagem , Neoplasias Ósseas/patologia , Criança , Humanos , Imagem Multimodal , Tomografia por Emissão de Pósitrons combinada à Tomografia Computadorizada , Sarcoma de Ewing/diagnóstico por imagem , Sarcoma de Ewing/terapia , Dedos do Pé/patologia
2.
Abdom Radiol (NY) ; 46(5): 2203-2218, 2021 05.
Artigo em Inglês | MEDLINE | ID: mdl-33090256

RESUMO

Ferumoxytol is an injectable ultrasmall superparamagnetic iron oxide that has been gaining interest regarding its off-label use as an intravenous contrast agent in magnetic resonance imaging (MRI). Due to its large particle size, its use with MRI produces exquisite images of blood vessels with little background contamination or parenchymal enhancement of the abdominopelvic organs, except for the liver and spleen. Because ferumoxytol is neither an iodinated nor a gadolinium-based contrast agent, there are no restrictions for its use in patients with poor renal function. This article will highlight normal features in ferumoxytol-enhanced MRI in the abdomen and pelvis as well as its applications in evaluating vascular pathology, presurgical planning, and other problem solving.


Assuntos
Óxido Ferroso-Férrico , Imageamento por Ressonância Magnética , Abdome/diagnóstico por imagem , Meios de Contraste , Humanos , Pelve/diagnóstico por imagem
3.
Clin Imaging ; 69: 139-144, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-32731105

RESUMO

We present a case of perinephric myxoid pseudotumor of fat, a rare benign entity that often occurs in patients with non-neoplastic renal disease. In our case, an 80 year old man with end-stage renal disease was imaged over the course of 5 years during evaluation for renal transplantation. Imaging identified a left perinephric mass whose appearance over time and on different imaging modalities variably suggested a simple cyst, cystic neoplasm, and liposarcoma. Contrast enhanced examination was necessary to discern the solid nature of this mass, and ultimately, tissue sampling with histopathologic evaluation and molecular testing were required to make the diagnosis of myxoid pseudotumor of fat and exclude the imaging mimics.


Assuntos
Cistos , Doenças Renais Císticas , Lipossarcoma , Neoplasias Retroperitoneais , Idoso de 80 Anos ou mais , Humanos , Lipossarcoma/diagnóstico por imagem , Masculino
7.
Radiographics ; 31(5): 1365-75; discussion 1376-7, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21918049

RESUMO

Although diagnosing gout generally is straightforward, atypical disease may present a challenge if it is associated with unusual symptoms or sites, discordant serum urate level, or mimics of gout. Dual-energy computed tomography (CT) may be used to differentiate urate crystals from calcium by using specific attenuation characteristics, which may help diagnose gout. In patients with known tophaceous gout, dual-energy CT may be used for serial volumetric quantification of subclinical tophi to evaluate response to treatment. Given the utility of dual-energy CT in challenging cases and its ability to provide an objective outcomes measure in patients with tophaceous gout, dual-energy CT promises to be a unique and clinically relevant modality in the diagnosis and management of gout.


Assuntos
Artrite Gotosa/diagnóstico por imagem , Tomografia Computadorizada por Raios X/métodos , Ácido Úrico/análise , Artrite/diagnóstico , Artrite Gotosa/metabolismo , Calcinose/diagnóstico por imagem , Calcinose/metabolismo , Cristalização , Diagnóstico Diferencial , Desenho de Equipamento , Deformidades Adquiridas do Pé/diagnóstico por imagem , Deformidades Adquiridas do Pé/metabolismo , Deformidades Adquiridas da Mão/diagnóstico por imagem , Deformidades Adquiridas da Mão/metabolismo , Humanos , Hiperuricemia/complicações , Osteomielite/diagnóstico , Líquido Sinovial/química , Tendinopatia/diagnóstico
8.
Orthopedics ; 32(6): 385-453, 2009 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-19711884
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...