Role of Gadoxetic Acid-Enhanced Magnetic Resonance Imaging in the Preoperative Evaluation of Small Hepatic Lesions in Patients with Colorectal Cancer

2015 ◽  
Vol 39 (5) ◽  
pp. 1161-1166 ◽  
Author(s):  
Jai Young Cho ◽  
Yoon Jin Lee ◽  
Ho-Seong Han ◽  
Yoo-Seok Yoon ◽  
Jihoon Kim ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Colorectal Cancer ◽  
Magnetic Resonance ◽  
Preoperative Evaluation ◽  
Gadoxetic Acid ◽  
Resonance Imaging ◽  
Hepatic Lesions

scholarly journals The role of magnetic resonance imaging in the preoperative evaluation of anal fistulas

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Duc Vo ◽  
Chien Phan ◽  
Linh Nguyen ◽  
Huyen Le ◽  
Tin Nguyen ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Spin Echo ◽  
Preoperative Evaluation ◽  
Turbo Spin Echo ◽  
Resonance Imaging ◽  
Post Contrast ◽  
Fistula In Ano ◽  
Turbo Spin

AbstractThis study aimed to determine the role of magnetic resonance imaging (MRI) in diagnosing and describing the characteristics of fistula-in-ano, and the agreement between MRI and operative findings. We conducted a retrospective study in 367 patients with fistula-in-ano who were diagnosed and had an operation at the University Medical Center between January 2016 and January 2018. MRI findings were evaluated and compared with surgical findings using the kappa coefficient (k) method. 367 patients (327 male and 40 female, mean age 39.3 ± 12.4 years). A total of 411 primary fistulas were found during surgery. There was a strong agreement between MRI and surgery for classifying primary tracts (k = 0.89) and detecting secondary tracts (k = 0.94). While the sensitivity and specificity of MRI for detecting internal openings were 99% and 85.2% respectively; these rates were 100% for abscesses. Both T2-weighted turbo spin-echo (T2W TSE) and postcontrast fat-saturated T1-weighted turbo spin-echo (FS T1W TSE) sequences showed high sensitivity (96.6% and 98.4% respectively) and specificity (92.6% and 81.5% respectively) for depicting internal openings and secondary tracts. Post-contrast FS T1W TSE sequence was very effective in detecting abscesses with an accuracy of 100%. In conclusion, MRI can be considered an accurate tool for the preoperative evaluation of fistula-in-ano, which is a major determinant of the surgical outcome. Both T2W TSE and post-contrast FS T1W TSE sequences are highly accurate in depicting the features of fistula-in-ano. If there are no contraindications, contrast administration is recommended to differentiate abscesses from active inflammation.

scholarly journals Preoperative Staging of Colorectal Cancer — Computed Tomography and Magnetic Resonance Imaging

2003 ◽  
Vol 92 (1) ◽  
pp. 35-43 ◽  
Author(s):  
L. Blomqvist
Keyword(s):  
Magnetic Resonance Imaging ◽  
Colorectal Cancer ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Preoperative Evaluation ◽  
Preoperative Staging ◽  
Patient Acceptance ◽  
Resonance Imaging ◽  
New Techniques

Cross-sectional imaging techniques are increasingly being used in the preoperative evaluation of patients with colorectal cancer. Both computed tomography (CT) and magnetic resonance (MR) imaging have been improved with significant advances of the technological hard- and software. This has contributed to high patient acceptance due to shorter examination times and more open configuration of the systems, consistent high quality images with better delineation of the normal abdomino-pelvic anatomy and pathology. New techniques such as CT-colonography have emerged from a research application to a clinical tool which can be used in different clinical settings. Phased-array receiver coils have significantly increased the usefulness of MR in the evaluation of rectal neoplasms due to the high resolution that can be obtained. New organ specific contrast agents for magnetic resonance imaging have facilitated the preoperative evaluation of liver metastases in favour of more invasive techniques with similar sensitivities. However, preoperative staging criteria for colorectal cancer using computed tomography and magnetic resonance imaging has to be updated and the results of new techniques have to be confirmed in large trials. In the future, further development of CT and MR may offer ‘one-stop-shopping’ protocols for both diagnosis, local and distant staging of colorectal cancer. Diffusion weighted MR-imaging, in vivo spectroscopy as well as further targeted imaging, such as with lymph node specific agents for MR may also prove to be helpful in the preoperative evaluation of patients with colorectal cancer.

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