DWI of HCC could preoperatively provide quantitative parameters for predicting tumor histological grade. J. Magn. Reson. Imaging 2016;44:1442-1447.
The aim of the study was to investigate the value of preoperative diffusion-weighted imaging (DWI) in predicting microvascular invasion (MVI) of hepatocellular carcinoma (HCC), using and comparing mean and minimum apparent diffusion coefficient (ADC) values.Preoperative MR images of 318 patients with HCC confirmed by surgical pathology were retrospectively analyzed. All patients underwent preoperative DWI on a 1.5 Tesla MRI scanner. The mean and minimum ADC values of the tumors were measured. Interobserver agreements were assessed by the intraclass correlation coefficient (ICC). The ADC values were compared in HCCs between with and without MVI. ROC curves of ADC values were obtained and then compared in distinguishing HCCs with MVI from those without MVI.There were 211 HCCs with MVI and 107 HCCs without MVI. ICC for the measurements of the mean and minimum ADC values between both observers was 0.88 (95% CI 0.85 – 0.90) and 0.88 (95% CI 0.85 – 0.90), respectively. The mean and minimum ADC values of HCCs with MVI were lower than those of HCCs without MVI (P = .00, .00, respectively). With a cut-off value of 0.98 × 10–3 mm2/s, the minimum ADC (MinADC) showed a sensitivity of 62.56% and a specificity of 65.42% in predicting MVI, whereas the mean ADC provided a sensitivity of 79.15% and a specificity of 50.47% with a cut-off value of 1.19 × 10–3 mm2/s. No significant difference existed between MinADC and mean ADC for their diagnostic performances in the prediction of MVI (P = .48).DWI could preoperatively provide quantitative parameters for predicting MVI of HCC.
Abstract. In order to assess the diagnostic accuracy of diffusion weighted imaging (DWI) in differentiating between benign and malignant ovarian neoplasms, a systemic meta-analysis was conducted. Relevant studies were retrieved from scientific literature databases, including the PubMed, Wiley, EBSCO, Ovid, Web of Science, Wanfang, China National Knowledge Infrastructure and VIP databases. Following a multi-step screening and study selection process, the relevant data was extracted for use in the present study. Statistical analyses were performed using Meta-disc software version 1.4 and STATA statistical software version 12.0. A total of 285 articles were retrieved from the database searches. Following a careful screening process, 10 case-control studies were selected for the present meta-analysis. The 10 studies investigated the efficacy of DWI in diagnosing ovarian neoplasms, and included a combined total of 1,159 subjects, of which 559 patients had malignant lesions and 600 had benign lesions. The results showed that the pooled sensitivity, pooled specificity, pooled positive likelihood ratio, pooled negative likelihood ratio, pooled diagnostic odds ratio (DOR) and area under the curve of the summary receiver operating characteristics curve of DWI for differentiating between benign and malignant ovarian neoplasms were 0. 93, 0.89, 7.58, 0.10, 85.33 and 0.95, respectively
The true posterior communicating artery (PCoA) aneurysms in the distal portion of the posterior communicating artery are rare. The authors describe a 63-year-old woman with 1 true PCoA aneurysms in the distal portion of the PCoA, which was treated surgically through modified pterional approach. No neurologic deficit was present at the postoperative period. Although endovascular intervention is more and more widely used in the treatment of aneurysms, the authors have also emphasized that true PCoA aneurysms in the distal portion of the PCoA can also be surgically treated in suitable patients.
Objective: To investigate the value of 256-slice spiral CT angiography in the diagnosis and postoperative evaluation of patients with intracranial aneurysms. Methods: A total of 62 patients with intracranial aneurysms diagnosed by neurosurgery in our hospital were randomly collected from 2017.03–2018.11. The MSCTA was performed by labeling intravenous non-ionic contrast agent (iodosyls alcohol). The obtained image was imageprocessed at Sun's stand-alone workstation (Philip256iCT). Observe the position, shape, size of the aneurysm, the relationship between the neck and the artery and the structure of the skull base, and compare with the intraoperative findings to understand the anastomosis between the preoperative and intraoperative. Postoperatively, 28 cases were reviewed, and the surgical results, the patency of the arterial artery, and the presence or absence of aneurysm residual were confirmed. Results: Sixty-two patients with intracranial aneurysms were diagnosed with MSCTA and DSA. A total of 66 aneurysms and multiple aneurysms were found. Of these, 32 patients underwent direct operative MSCTA and 43 underwent craniotomy. Endovascular interventional therapy. The location, shape, size, relationship between the neck and the parental artery of the aneurysm and the DSA performance were basically consistent with MSCTA. No false positive results were found. Postoperative examination of MSCTA in 28 cases, all developed well, the arterial artery was well patency, no residual aneurysm was seen. Conclusion: MSCTA can accurately display the location, shape and size of the aneurysm, the relationship between the neck and the artery and the structure of the skull base. It can be used as an important tool for clinical diagnosis and treatment of aneurysm imaging. An important method for post-review and follow-up.
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