Non-neoplastic intracranial cystic lesions: not everything is an arachnoid cyst
Abstract Intracranial cystic lesions are common findings on neuroimaging examinations, arachnoid cysts being the most common type of such lesions. However, various lesions of congenital, infectious, or vascular origin can present with cysts. In this pictorial essay, we illustrate the main causes of non-neoplastic intracranial cystic lesions, discussing their possible differential diagnoses as well as their most relevant imaging aspects.Resumo Les ões císticas intracranianas são achados comuns nos exames de neuroimagem, sendo os cistos aracnoides os mais comuns. Porém, muitas outras lesões, de origem congênita, infecc...
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Percutaneous solutions for biliary stent dysfunction: pictorial essay
Abstract Plastic and metal biliary stents can fail to function properly, such failure being due to a positioning error or to the migration, occlusion, or fracture of the stent. An obstructed biliary stent can act as a nidus, causing complications such as recurrent persistent cholangitis. It can also cause vascular complications (such as bleeding and the formation of pseudoaneurysms), perforate the liver capsule (causing biloma or abscess), or, in rare cases, cause intestinal obstruction or perforation. In this pictorial essay, we demonstrate various interventional radiology techniques for the treatment of biliary stent dys...
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Applications of the Dixon technique in the evaluation of the musculoskeletal system
Abstract The acquisition of images with suppression of the fat signal is very useful in clinical practice and can be achieved in a variety of sequences. The Dixon technique, unlike other fat suppression techniques, allows the signal of fat to be suppressed in the postprocessing rather than during acquisition, as well as allowing the visualization of maps showing the distribution of water and fat. This review of the Dixon technique aims to illustrate the basic physical principles, to compare the technique with other magnetic resonance imaging sequences for fat suppression or fat quantification, and to describe its applicati...
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Proposal for computer-aided diagnosis based on ultrasound images of the kidney: is it possible to compare shades of gray among such images?
Conclusion: Our findings indicate that a gray-scale analysis of ultrasound images of the kidney performs better when the image acquisition process is standardized and the images undergo a process of normalization.Resumo Objetivo: Comparar imagens renais ultrassonogr áficas obtidas de maneira aleatória e controlada (padronizando fatores físicos do aparelho de ultrassom) por diferentes profissionais e aparelhos. Materiais e Métodos: Foram obtidos quatro tipos de imagens, de acordo com sua aquisição e processamento por cinco profissionais e dois tipos de ap arelhos de ultrassonografia, em 24 pacientes, totalizando 919...
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Direct and virtual measurements of abdominal aortic aneurysms: three-dimensional printed models
Conclusion: Computed tomography measurements of 3D-printed biomodels of AAAs appear to be comparable to those of threedimensional CTA measurements of the same AAAs, in terms of the metric and volumetric dimensions.Resumo Objetivo: Validar a aplica ção do método de impressão tridimensional de biomodelos para aferição métrica e volumétrica de segmentos de aneurisma de aorta abdominal. Materiais e Métodos: Compararam-se as medidas obtidas por tomografia computadorizada dos biomodelos tridimensionais com as realizadas no planejamento pr é-operatório de pacientes submetidos a correção endovascular de aneurisma de...
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Biliary involvement in liver metastases: long-term experience with biliary biopsy from a single center
Conclusion: Percutaneous transluminal forceps biopsy is a safe, effective, minimally invasive procedure for histological characterization in patients presenting with obstructive jaundice due to a non-primary biliary tumor.Resumo Objetivo: Investigar os resultados a longo prazo da bi ópsia endobiliar realizada com um pinça tipo fórceps transluminal no diagnóstico de neoplasia biliar metastática. Materiais e Métodos: Entre setembro de 2014 e junho de 2019, 25 pacientes - 18 homens (72%), com idade média de 65 ± 15 anos) - foram submetidos a 26 procedimentos de biópsia e ndobiliar com um conjunto dedicado. Todos os...
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Tomographic findings in bronchial atresia
Conclusion: The diagnosis of bronchial atresia can be reliably made on the basis of a finding of bronchocele accompanied by hyperinflation of the adjacent lung parenchyma.Resumo Objetivo: Analisar os achados na tomografia computadorizada (TC) de t órax de 23 pacientes com atresia brônquica. Materiais e Métodos: As imagens de TC foram avaliadas por dois observadores e os casos discordantes foram resolvidos por consenso. Os critérios de inclusão foram a presença de anormalidades na TC compatíveis com atresia brônquica e/ou diagnóstico confirmado por exame anatomopatológico das peças cirúrgicas para os paciente...
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Chest computed tomography in COVID-19 pneumonia: a retrospective study of 155 patients at a university hospital in Rio de Janeiro, Brazil
Conclusion: The patterns of CT findings are useful for the diagnosis of COVID-19 and the evaluation of disease severity criteria. The presence of any comorbidity is associated with greater severity of COVID-19.Resumo Objetivo: Definir os crit érios diagnósticos da COVID-19 na tomografia computadorizada (TC), estudar a concordância entre a TC e o PCR e determinar a associação da extensão do envolvimento parenquimatoso e ventilação mecânica com os achados tomográficos e características clínicas da amostra. Materiais e Métodos : Estudo de 155 pacientes com COVID-19 atendidos entre março e maio de 2020. Tentamo...
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Practical considerations for evaluation of images of the breast during pregnancy and lactation
(Source: Radiologia Brasileira)
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Patellar chondropathy: a brief overview of its history and prevalence
(Source: Radiologia Brasileira)
Source: Radiologia Brasileira - February 3, 2021 Category: Radiology Source Type: research
Computed tomography-guided biopsy of breast lesions: a viable option for selected cases
Abstract Portal vein thrombosis refers to complete or partial obstruction of the portal venous system, in the intrahepatic or extrahepatic venous tract or even in the splenic or superior mesenteric veins. This common and potentially fatal condition can develop in various clinical contexts, especially those of liver cirrhosis, hepatocellular carcinoma, and other solid tumors. Certain characteristics, such as the time since the onset of the thrombus (acute or chronic), its biology (hematic or tumoral), the presence of collateral vessels, and the magnetic resonance imaging aspects, are important components of a thorough, care...
Source: Radiologia Brasileira - November 20, 2020 Category: Radiology Source Type: research
The ABCD of portal vein thrombosis: a systematic approach
Abstract Portal vein thrombosis refers to complete or partial obstruction of the portal venous system, in the intrahepatic or extrahepatic venous tract or even in the splenic or superior mesenteric veins. This common and potentially fatal condition can develop in various clinical contexts, especially those of liver cirrhosis, hepatocellular carcinoma, and other solid tumors. Certain characteristics, such as the time since the onset of the thrombus (acute or chronic), its biology (hematic or tumoral), the presence of collateral vessels, and the magnetic resonance imaging aspects, are important components of a thorough, care...
Source: Radiologia Brasileira - November 20, 2020 Category: Radiology Source Type: research
Primary bone lymphoma: pictorial essay
Abstract Primary bone lymphoma is a rare neoplasm that can initially present as local pain, a palpable mass, and pathologic fracture. It can also be discovered as an incidental finding on an imaging examination. It is defined as a bone marrow tumor with no involvement of other sites, lasting at least six months. The diagnosis is confirmed by biopsy and immunohistochemical analysis. Although the imaging characteristics are nonspecific, there are certain findings that, when correlated with clinical and epidemiological aspects, can increase the level of suspicion of primary bone lymphoma. The classic imaging aspect is a bone ...
Source: Radiologia Brasileira - November 20, 2020 Category: Radiology Source Type: research
Anatomical variations and congenital anomalies of the ribs revisited by multidetector computed tomography
The objective of this pictorial essay was to use multislice computed tomography images to illustrate the imaging aspects of the main anatomical variations and congenital anomalies of the ribs.Resumo As variantes anat ômicas dos arcos costais são, geralmente, achados incidentais nos exames de imagem, em razão do seu comportamento assintomático ou quadro inespecífico, podendo constituir alterações isoladas ou relacionadas a anomalias e síndromes clínicas. Essas alterações são facilmente negligenciadas na radiografia convencional e na tomografia computadorizada se não forem investigadas ativamente, principalmente...
Source: Radiologia Brasileira - November 20, 2020 Category: Radiology Source Type: research
Pregnancy-lactation cycle: how to use imaging methods for breast evaluation
Abstract Pregnancy and lactation constitute states of intense hormonal variation with secretory and structural changes in the breast parenchyma. These changes translate into important features on breast imaging, as well as the emergence of specific benign and malignant lesions. This literature review aims to discuss the safety of the use of breast imaging methods (mammography, ultrasound, and magnetic resonance imaging) during the pregnancy-lactation cycle, and to present the expected physiological changes and imaging appearance of the main breast diseases that may occur in this period, such as galactocele, lactating adeno...
Source: Radiologia Brasileira - November 20, 2020 Category: Radiology Source Type: research
