- 著者
- Yusuke Ayabe Kohei Hamamoto Yoshikazu Yoshino Yoshimasa Ikeda Emiko Chiba Hironao Yuzawa Noriko Oyama-Manabe
- 出版者
- Japanese Society for Magnetic Resonance in Medicine
- 雑誌
- Magnetic Resonance in Medical Sciences (ISSN:13473182)
- 巻号頁・発行日
- pp.tn.2021-0106, (Released:2021-12-11)
- 参考文献数
- 11
- 被引用文献数
- 3
A flow-diverter (FD) device is a well-established tool for the treatment of unruptured intracranial aneurysms. Time-of-flight (TOF) MR angiography (MRA) is widely used for postoperative assessment after the treatment with FD; however, it cannot fully visualize intra-aneurysmal and intrastent flow signals due to the magnetic susceptibility from the FD. Recently, the utility of MRA with ultra-short TE (UTE) sequence and arterial spin labeling technique in assessing the therapeutic efficacy of intracranial aneurysms treated with metallic devices has been reported, but long image acquisition time is one of the drawbacks of this method. Herein, we introduce a novel UTE MRA using the subtraction method that enables the reduction in susceptibility artifacts with a short image acquisition time.
- 著者
- Koichi Ito Emiko Chiba Noriko Oyama-Manabe Satoshi Washino Osamu Manabe Tomoaki Miyagawa Kohei Hamamoto Masahiro Hiruta Keisuke Tanno Hiroshi Shinmoto
- 出版者
- Japanese Society for Magnetic Resonance in Medicine
- 雑誌
- Magnetic Resonance in Medical Sciences (ISSN:13473182)
- 巻号頁・発行日
- pp.mp.2020-0182, (Released:2021-05-15)
- 参考文献数
- 23
- 被引用文献数
- 1
Purpose: To assess the diagnostic performance of the tumor contact length (TCL) and apparent diffusion coefficient (ADC) for predicting extraprostatic extension (EPE) of prostate cancer with capsular abutment (CA).Methods: Ninety-three patients with biopsy-proven prostate cancer underwent 3-Tesla MRI, including diffusion-weighted imaging (b value = 0, 2000 s/mm2) and radical prostatectomy. Two experienced radiologists, blinded to the clinicopathological data, retrospectively assessed the presence of CA on T2-weighted imaging (T2WI). TCL on T2WI and ADC values were measured on detecting CA in prostate cancer. We used the receiver operating characteristic curves to assess the diagnostic performance of TCL and ADC values for predicting EPE.Results: CA was present in 58 prostate cancers among 93 patients. The cut-off value for TCL was 6.9 mm, which yielded an area under the curve (AUC) of 0.75. This corresponded to a sensitivity, specificity, and accuracy of 84.2%, 61.5%, and 69.0%, respectively. The cut-off value for ADC was 0.63 × 10–3 mm2/s, which yielded an AUC of 0.76. This, in turn, corresponded to a sensitivity, specificity, and accuracy of 84.2%, 59.0%, and 67.2%, respectively. The combined cut-off value of TCL and ADC yielded an AUC of 0.82. The specificity (84.6%) and accuracy (81.0%) of the combined value were superior to their individual values (P < 0.05).Conclusion: A combination of TCL and ADC values provided high specificity and accuracy for detecting EPE of prostatic cancer with CA.
- 著者
- Liangcheng Wang Kohei Hamamoto Azusa Kimura Aya Ishiguro Isao Horiuchi Kenjiro Takagi
- 出版者
- Japan Society for the Study of Hypertension in Pregnancy
- 雑誌
- Hypertension Research in Pregnancy (ISSN:21875987)
- 巻号頁・発行日
- pp.HRP2020-001, (Released:2020-06-10)
- 参考文献数
- 8
Intrauterine balloon tamponade (IBT) is widely used for treating obstetric hemorrhage. However, only a few reports on IBT failure exist. We report a case of IBT failure caused by an over-expanded lower uterine segment (LUS). A 30-year-old woman with twin pregnancy presented with bleeding after cesarean section. During surgery, uterine atony was observed; however, intravenous administration of oxytocin and ergometrine resolved the condition. Continuous hemorrhage was observed postoperatively, despite the administration of uterotonics and uterine massage. Although IBT was performed, the bleeding persisted, as recognized from the drainage fluid. Enhanced computed tomography revealed that the bleeding spot could not be compressed by the inflated balloon due to the over-expanded LUS. The balloon was removed; uterine artery embolization was required to achieve hemostasis. Our experience indicated that over-expanded LUS could cause IBT failure. If bleeding continues post-IBT replacement and an over-expanded LUS is observed, alternative treatments should be promptly provided.