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1.
Clin Imaging ; 38(2): 187-90, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24405866

RESUMO

Although a certain degree of arteriovenous shunting may be expected in glioblastoma, to our knowledge, the coexistence of a glioblastoma and arteriovenous fistula has not been previously reported. In this case report, we present such a lesion and discuss its diagnosis with a multimodal imaging approach. Additionally, we discuss treatment considerations for such a lesion.


Assuntos
Fístula Arteriovenosa/diagnóstico , Neoplasias Encefálicas/diagnóstico , Glioblastoma/diagnóstico , Imagem Multimodal , Adulto , Fístula Arteriovenosa/complicações , Fístula Arteriovenosa/terapia , Encéfalo/patologia , Neoplasias Encefálicas/complicações , Neoplasias Encefálicas/terapia , Angiografia Cerebral , Evolução Fatal , Feminino , Glioblastoma/complicações , Glioblastoma/terapia , Humanos , Imageamento por Ressonância Magnética , Técnica de Subtração , Tomografia Computadorizada por Raios X
2.
Arch Otolaryngol Head Neck Surg ; 138(7): 676-9, 2012 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-22801892

RESUMO

Acute calcific longus colli tendinitis (LCT) has been reported as an unusual cause of acute-onset neck pain, dysphagia, and headache.(1-5) As described in most of the published reports, LCT traditionally manifests on computed tomography (CT) imaging as paramidline calcium hydroxyapatite crystal deposits anterior to the C1 and C2 vertebral bodies. However, recent studies have brought attention to the disease existing at the C4-C5 and C5-C6 levels.(6,7) Acute LCT is considered relatively benign, typically resolving on its own within several weeks.


Assuntos
Calcinose/diagnóstico por imagem , Abscesso Retrofaríngeo/diagnóstico por imagem , Tendinopatia/diagnóstico por imagem , Paralisia das Pregas Vocais/diagnóstico , Doença Aguda , Idoso , Calcinose/cirurgia , Diagnóstico Diferencial , Humanos , Laringoscopia , Masculino , Abscesso Retrofaríngeo/cirurgia , Tendinopatia/cirurgia , Tomografia Computadorizada por Raios X , Paralisia das Pregas Vocais/cirurgia
3.
Magn Reson Imaging ; 29(6): 844-52, 2011 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-21571479

RESUMO

Cerebral microbleeds (CMBs) are increasingly being recognized as an important biomarker for neurovascular diseases. So far, all attempts to count and quantify them have relied on manual methods that are time-consuming and can be inconsistent. A technique is presented that semiautomatically identifies CMBs in susceptibility weighted images (SWI). This will both reduce the processing time and increase the consistency over manual methods. This technique relies on a statistical thresholding algorithm to identify hypointensities within the image. A support vector machine (SVM) supervised learning classifier is then used to separate true CMB from other marked hypointensities. The classifier relies on identifying features such as shape and signal intensity to identify true CMBs. The results from the automated section are then subject to manual review to remove false-positives. This technique is able to achieve a sensitivity of 81.7% compared with the gold standard of manual review and consensus by multiple reviewers. In subjects with many CMBs, this presents a faster alternative to current manual techniques at the cost of some lost sensitivity.


Assuntos
Hemorragia Cerebral/diagnóstico , Demência Vascular/diagnóstico , Interpretação de Imagem Assistida por Computador/métodos , Angiografia por Ressonância Magnética/métodos , Algoritmos , Doença de Alzheimer/patologia , Reações Falso-Positivas , Humanos , Aumento da Imagem/métodos , Estudos Longitudinais , Reconhecimento Automatizado de Padrão , Sensibilidade e Especificidade
4.
J Magn Reson Imaging ; 31(1): 142-8, 2010 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-20027582

RESUMO

PURPOSE: To monitor changes in the number of cerebral microbleeds (CMBs) in a longitudinal study of healthy controls (HC) and mild-cognitively impaired (MCI) patients using susceptibility weighted imaging (SWI). MATERIALS AND METHODS: SWI was used to image 28 HC and 75 MCI patients annually at 1.5 Tesla over a 4-year period. Magnitude and phase data were used to visualize CMBs for the first and last scans of 103 subjects. RESULTS: Preliminary analysis revealed that none of the 28 HC had more than three CMBs. In the 75 MCI patients, five subjects had more than three CMBs in both first and last scans, while one subject had more than three bleeds only in the last scan. In five of these six MCI patients, the number of CMBs increased over time and all six went on to develop progressive cognitive impairment (PCI). Of the 130 total CMBs seen in the last scans of the six MCI cases, most were less than 4 mm in diameter. CONCLUSION: SWI can reveal small CMBs on the order of 1 mm in diameter and this technique can be used to follow their development longitudinally. Monitoring CMBs may be a means by which to evaluate patients for the presence of microvascular disease that leads to PCI.


Assuntos
Hemorragia Cerebral/diagnóstico , Transtornos Cognitivos/diagnóstico , Demência Vascular/diagnóstico , Interpretação de Imagem Assistida por Computador/métodos , Angiografia por Ressonância Magnética/métodos , Idoso , Idoso de 80 Anos ou mais , Hemorragia Cerebral/complicações , Transtornos Cognitivos/complicações , Demência Vascular/complicações , Feminino , Humanos , Aumento da Imagem/métodos , Masculino , Pessoa de Meia-Idade , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
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