scholarly journals Early Revascularization in a Patient With Perfusion Computed Tomography/Diffusion-Weighted Magnetic Resonance Imaging Mismatch Secondary to Acute Vertebral Artery Occlusion

2005 ◽  
Vol 45 (6) ◽  
pp. 306-310 ◽  
Author(s):  
Kuniaki OGASAWARA ◽  
Makoto SASAKI ◽  
Nobuhiko TOMITSUKA ◽  
Yoshitaka KUBO ◽  
Takashi INOUE ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Vertebral Artery ◽  
Artery Occlusion ◽  
Resonance Imaging ◽  
Perfusion Computed Tomography ◽  
Vertebral Artery Occlusion ◽  
Early Revascularization ◽  
Weighted Magnetic Resonance Imaging

Evaluation of Extramural Venous Invasion by Diffusion-Weighted Magnetic Resonance Imaging and Computed Tomography in Rectal Adenocarcinoma

2019 ◽  
Vol 70 (4) ◽  
pp. 457-465 ◽  
Author(s):  
Aysegul Gursoy Coruh ◽  
Elif Peker ◽  
Atilla Elhan ◽  
Ilhan Erden ◽  
Ayse Erden
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Roc Analysis ◽  
Rectal Adenocarcinoma ◽  
Venous Invasion ◽  
Distant Metastases ◽  
Resonance Imaging ◽  
Adc Values ◽  
Weighted Magnetic Resonance Imaging

Purpose The aim of this study is to evaluate the diagnostic contribution of diffusion-weighted magnetic resonance imaging (MRI) and computed tomography (CT) to distinguish extramural venous invasion (EMVI) in rectal adenocarcinoma. Materials and Methods Fifty-eight patients who had been diagnosed with rectal adenocarcinoma (30 patients with EMVI and 28 patients without EMVI) were enrolled in the study. Apparent diffusion coefficient (ADC) values of the tumour and the EMVI (+) vein, the lengths of the tumours were measured on MRI. The diameters of the superior rectal vein (SRV)-inferior mesenteric vein (IMV) and distant metastatic spread were evaluated on CT. The ability of these findings to detect EMVI was assessed using receiver operating characteristic (ROC) analysis. Pathology was accepted as the reference test for EMVI. Results Mean diameters of the SRV (4.9 ± 0.9 mm vs 3.7 ± 0.8 mm) and IMV (6.9 ± 0.8 mm vs 5.4 ± 0.9 mm) were significantly larger ( P < .001) and tumour ADC values were significantly lower (0.926 ± 0.281 × 10−3 mm2/s vs 1.026 ± 0.246 × 10−3 mm2/s; P = .032) in EMVI (+) patients. Diameters of 3.95 mm for the SRV (area under the curve [AUC] ± standard error [SE]: 0.851 ± 0.051, P < .001, sensitivity: 93.3%, specificity: 67.9%) and 5.95 mm for the IMV (AUC ± SE: 0.893 ± 0.040, P < .001, sensitivity: 93.3%, specificity: 71.4%) and an ADC value of 0.929 × 10−3 mm2/s (AUC ± SE: 0.664 ± 0.072, P = .032 sensitivity: 76.7%, specificity: 57.1%) were found to be cutoff values, determined by ROC analysis, for detection of EMVI. Distant metastases were significantly more prevalent in EMVI (+) patients ( P < .001). Conclusion The measurement of ADC values and SRV-IMV diameters seems to have contribution for diagnosis of EMVI in rectal adenocarcinoma. EMVI (+) patients appear to have higher risks of distant metastases at diagnosis.

scholarly journals Magnetic resonance imaging and perfusion computed tomography capacities in brain glial tumors diagnosis

2015 ◽  
Vol 96 (6) ◽  
pp. 949-952
Author(s):  
A V Balandina ◽  
A V Kapishnikov ◽  
S V Kozlov
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Radiation Necrosis ◽  
Resonance Imaging ◽  
Glial Tumors ◽  
Perfusion Computed Tomography ◽  
Before And After ◽  
Degree Of Malignancy ◽  
Residual Tissue

Aim. To study magnetic resonance imaging and perfusion computed tomography capacities in the glial tumors diagnosis. Methods. 50 patients were examined using magnetic resonance imaging and perfusion computed tomography before and after treatment of glial tumors. Results. Perfusion computed tomography followed by pathomorphologic study confirmed the presence of glioblastoma in 48 patients before treatment. The presence of glioblastoma grade 4 was confirmed in 48 patients according to histological findings, and secondary (metastatic) tumors were identified in 2 patients. Glial tumors signs were revealed in all patients after MRI examination. Diagnostic tests using both methods were performed after treatment. The presence of residual tissue and radiation necrosis was not always accurately detected when using magnetic resonance imaging. During perfusion computed tomography performed on 32 patients continued tumor growth was identified in 28 patients, and presence of radiation necrosis - in 4. Histological examination confirmed the diagnosis accuracy in 24 patients, and presence of post-radiation changes in 4 patients. Conclusion. The data clearly demonstrate the need for the complex use of magnetic resonance imaging and perfusion computed tomography in suspected glial brain tumors before and after treatment, what allows to reliably estimate the presence of neoplasms, specify the location and degree of malignancy, correct further diagnostic and therapeutic tactics.

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