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Rapid Progression of Cerebral Infarction after Intraventricular Hemorrhage in Adult Moyamoya Disease
Matsumoto, Hiroaki,Yoshida, Yasuhisa The Korean Neurosurgical Society 2013 Journal of Korean neurosurgical society Vol.54 No.5
The authors present a rare case of adult moyamoya disease in which a patient experienced rapid progression of cerebral infarction after intraventricular hemorrhage (IVH). A healthy 39-year-old woman was admitted to our hospital with sudden headache, a decreased level of consciousness and mild tetraparesis. Initial magnetic resonance imaging revealed small cerebral infarction and IVH. Although the patient underwent conservative therapy including hypervolemia, hemodilution, keeping moderate hypertension and administration of a free radical scavenger, she showed a fulminant clinical course of cerebral infarction. The authors discuss the possible pathophysiology and suggest the treatment for such cases.
Magnetic-field-induced Odd-frequency Superconductivity in s-Wave Superconductors
Masashige Matsumoto,Mikito Koga,Hiroaki Kusunose 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The wavefunction of the Cooper pair of the conventional BCS state is characterized by an evenparity(s-wave) spin-singlet state. An external magnetic field is well known to modify the wavefunctionof the Cooper pair and to break the conventional BCS superconducting state. We find thatthe wavefunction of the modified Cooper pair contains a spin-triplet component with s-wave orbitalsymmetry. While the spin-triplet s-wave Cooper pair is forbidden owing to the fermion property,it is permitted in the generalized theoretical framework containing an odd-frequency dependenceof the order parameter. We investigate this point on the basis of the self-consistent calculationin the Eliashberg theory and find that the odd-frequency order parameter coexists with the evenfrequencyone. We also report how the physical properties are affected by the induced odd-frequencysuperconducting order parameter.
Utility of Discography as a Preoperative Diagnostic Tool for Intradural Lumbar Disc Herniation
Tomiya Matsumoto,Hiromitsu Toyoda,Hidetomi Terai,Sho Dohzono,Yusuke Hori,Hiroaki Nakamura 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.4
Preoperative definitive diagnosis of intradural lumbar disc herniation (ILDH) is difficult despite the availability of various neuroradiological investigative tools. We present a case of ILDH diagnosed preoperatively by discography and computed tomography-discography (disco-CT).The patient was a 63-year-old man with acute excruciating right leg pain. Discography and disco-CT demonstrated leakage of the contrast medium into the intradural space. Based on these findings, a right L5 nerve root disturbance caused by ILDH was diagnosed. A right L5 hemi-laminectomy and a dorsal durotomy were performed. The herniated disc was carefully dissected and then completely removed. Three months after surgery, the patient had fully recovered. This report highlights the importance of making a definitive diagnosis of ILDH preoperatively for better surgical planning and improved clinical outcomes. Furthermore, discography and disco-CT are both useful preoperative diagnostic tools for the diagnosis of ILDH.
Harunobu Matsumoto,Mototsugu Shimokawa,Kaei Nasu,Ayumi Shikama,Takaya Shiozaki,Masayuki Futagami,Kentaro Kai,Hiroaki Nagano,Taisuke Mori,Mitsutake Yano,Norihiro Sugino,Etsuko Fujimoto,Norihito Yoshiok 대한부인종양학회 2019 Journal of Gynecologic Oncology Vol.30 No.6
Objective: We conducted a retrospective, multi-institutional, collaborative study to accumulate cases of neuroendocrine carcinoma of the endometrium, to clarify its clinicopathologic features, treatment, prognosis and prognostic factors to collate findings to establish future individualized treatment regimens. To our knowledge, this is the largest case study and the first study to statistically analyze the prognosis of this disease. Methods: At medical institutions participating in the Kansai Clinical Oncology Group/Intergroup, cases diagnosed at a central pathologic review as neuroendocrine carcinoma of the endometrium between 1995 and 2014 were enrolled. We retrospectively analyzed the clinicopathologic features, treatment, prognosis and prognostic factors of this disease. Results: A total of 65 cases were registered from 18 medical institutions in Japan. Of these, 42 (64.6%) cases were diagnosed as neuroendocrine carcinoma of the endometrium based on the central pathological review and thus included in the study. Advanced International Federation of Gynecology and Obstetrics stages (stage III and IV) and pure type small cell neuroendocrine carcinoma cases had a significantly worse prognosis. Upon multivariate analysis, only histologic subtypes and surgery were significant prognostic factors. Pure type cases had a significantly worse prognosis compared to mixed type cases and complete surgery cases had a significantly better prognosis compared to cases with no or incomplete surgery. Conclusion: Our findings suggest that complete surgery improves the prognosis of neuroendocrine carcinoma of the endometrium. Even among cases with advanced disease stages, if complete surgery is expected to be achieved, clinicians should consider curative surgery to improve the prognosis of neuroendocrine carcinoma of the endometrium.
Yuichi NISHIDA,WANG Hui,Hiroaki MATSUMOTO,Hiroyuki ISHIHARA,Tokumi YOKOHIRA,Yukinobu FUKUSHIMA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In wired and wireless mixed networks, split-connection type proxies have been proposed to improve TCP (Transmission Control Protocol) throughput. A proxy is placed at the boundary between a wired network and a wireless one and splits a TCP connection which is established between a host in one of these networks and a host in the other networks into two virtual TCP connections. In this paper, under such environment that IEEE 802.11 WLANs are used as wireless networks, we first investigate throughputs of TCP connections with a proxy and show that although throughputs of downflows (flows from hosts in a wired network to a host in a WLAN) are improved, throughputs of upflows (the reverse of downflows) become smaller compared to those of TCP connections without the proxy. And we clarify that such throughput degradation is caused by congestion of a WLAN, and we propose a method to suppress such congestion.
Complex Revision Surgery for Cervical Deformity or Implant Failure
Nobuyuki Shimokawa,Hidetoshi Sato,Hiroaki Matsumoto,Toshihiro Takami 대한척추신경외과학회 2020 Neurospine Vol.17 No.3
Postoperative cervical deformity sometimes occurs in the short or long term after primary surgery for cervical disorders related to the degenerative aging spine, neoplastic etiologies, hemodialysis, infection, inflammation, trauma, etc. Cervical kyphosis after posterior decompression surgery, such as laminectomy or laminoplasty, is a common problem for spine surgeons. However, revision surgery for cervical deformity is definitely one of the most challenging areas for spine surgeons. There is no doubt that surgery for cervical deformity carries a high risk of surgery-related complications that might result in aggravation of healthrelated quality of life. Revision surgery is even more challenging. Hence, spine surgeons need to assess carefully the overall severity of the underlying condition before revision surgery, and try to refine the surgical strategy to secure safe surgery. Needless to say, spine surgeons are now facing great challenges in making spine surgery a much more reliable and convincing entity.
Nobuyuki Shimokawa,Hidetoshi Sato,Hiroaki Matsumoto,Toshihiro Takami 대한척추신경외과학회 2019 Neurospine Vol.16 No.3
Determining the optimal surgical method for cervical ossification of the posterior longitudinal ligament (OPLL) is challenging. The surgical indication should be made based on not only radiological findings, but also the patient’s age, preoperative neurological findings, social background, activities of daily life, and the presence or absence of comorbid diseases. Anterior resection for OPLL with or without wide corpectomy and fusion, posterior decompression with or without relatively long fusion, or anterior and posterior combined surgery may be considered. When evaluating the clinical condition of patients with cervical OPLL before surgery, various radiological parameters should be carefully considered, including the number of spinal segments involved, the cervical alignment or tilt angle, the relationship between OPLL and the C2–7 line (termed the “K-line”), the occupying ratio of OPLL, and the involvement of dural ossification. The objective of this article is to review the radiological parameters in current use for deciding upon the optimal surgical strategy and for predicting surgical outcomes, focusing on cervical OPLL.