AJR. American journal of roentgenology
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AJR Am J Roentgenol · Aug 2009
Diffusion-weighted imaging of surgically resected hepatocellular carcinoma: imaging characteristics and relationship among signal intensity, apparent diffusion coefficient, and histopathologic grade.
The objective of our study was to determine the relationship between the signal intensity of hepatocellular carcinoma (HCC) assessed with diffusion-weighted imaging (DWI) and T2-weighted imaging and the apparent diffusion coefficient (ADC) with the histopathologic grade of each nodule. ⋯ The histopathologic grade of HCC had no correlation with the ADC, but HCC tumors tended to show a higher signal on DWI as the histopathologic grade rose. However, predicting the correct histopathologic grade of each HCC before surgery on the basis of DWI findings was difficult because of the large overlap among histopathologic grades.
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AJR Am J Roentgenol · Aug 2009
Probability of reduced renal function after contrast-enhanced CT: a model based on serum creatinine level, patient age, and estimated glomerular filtration rate.
The objectives of our study were to develop a model to predict the probability of reduced renal function after outpatient contrast-enhanced CT (CECT)--based on patient age, sex, and race and on serum creatinine level before CT or directly based on estimated glomerular filtration rate (GFR) before CT--and to determine the relationship between patients with changes in creatinine level that characterize contrast-induced nephropathy and patients with reduced GFR after CECT. ⋯ The probability of a reduced estimated GFR after CECT can be predicted by the pre-CT estimated GFR using the four-variable MDRD equation. Furthermore, standard criteria for contrast-induced nephropathy are poor predictors of poor renal function after CECT. Criteria need to be established for what is an acceptable risk to manage patients undergoing CECT.
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The purpose of our study was to show that sonography allows precise assessment of the location and course of the superficial peroneal nerve and of its relationship with other structures. ⋯ The superficial peroneal nerve can be clearly depicted by sonography. Knowledge of the nerve's precise location, which may show individual variations, may have useful clinical applications.
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AJR Am J Roentgenol · Jul 2009
Risk factors involved in the development of pneumothorax during radiofrequency ablation of lung neoplasms.
The purpose of this study was to retrospectively evaluate the risk factors involved in the development of pneumothorax during radiofrequency ablation of lung tumors. ⋯ The development of pneumothorax complicating radiofrequency ablation can be unpredictable, but the many risk factors involved can make the incidence higher among some patients than others. Some of these risk factors are technically avoidable and have to be ruled out.