Kouichi Sugiyama

Learn More
Many evidences suggest that the central nervous system (CNS) acquires and switches internal models for adaptive control in various environments. However, little is known about the neural mechanisms responsible for the switching. A recent computational model for simultaneous learning and switching of internal models proposes two separate switching(More)
Urachal mucinous cystadenocarcinoma associated with pseudomyxoma peritonei is extremely rare; only 11 cases are reported. We describe the characteristic imaging findings of this disorder and correlate imaging features by computed tomography, magnetic resonance imaging, and ultrasonography with operative findings and histopathologic specimens.
Inflammatory myofibroblastic tumor (IMT), also called "inflammatory pseudotumor", is a rare benign tumor composed of spindle cells with a variable infiltrate of inflammatory cells and fibrous tissue. There have been many reported cases of IMT in every organ system; however, IMT in the mediastinum is rare. We report a rare, proven case of spontaneous(More)
We report here 3 cases of rectal varices treated with endoscopic variceal ligation and discuss the pathogenesis, treatment, and prognosis of rectal varices with referring to previous reports. Of the 3 patients, 2 had been diagnosed as liver cirrhosis and 1 as extrahepatic portal hypertension. All of the 3 patients had previously undergone treatment of(More)
AIM To elucidate the mechanism of occurrence of splanchnic artery aneurysm associated with coeliac artery stenosis due to compression by the median arcuate ligament, and also to discuss the management for this relatively rare condition. MATERIALS AND METHODS Five consecutive cases of splanchnic artery aneurysm associated with coeliac axis stenosis due to(More)
Pituitary adenylate cyclase-activating polypeptide (PACAP) is a pleiotropic neuropeptide considered to be a potent regulator of astrocytes. It has been reported that PACAP also affects astrocytoma cell properties, but the proliferative effects of this peptide in previous reports were inconsistent. The purpose of this study was to search for correlations(More)
Pseudoneoplastic glandular lesions are benign lesions that are often histologically and radiographically confused with adenoma malignum, which is a rare variant of mucinous adenocarcinoma of the uterine cervix. 15 cases of pseudoneoplastic glandular lesions, characterized by multilocular cystic masses in the uterine cervix, were investigated; these lesions(More)
Pituitary adenylate cyclase-activating polypeptide (PACAP) is a neuroprotective peptide expressed in the central nervous system. Although many studies have shown a neuroprotective effect of PACAP, the mechanism of PACAP in the treatment of spinal cord injury (SCI) is yet to be elucidated. The purpose of this study was to examine the efficacy and underlying(More)
We report the magnetic resonance (MR) findings of clear-cell adenocarcinofibroma of the ovary. A huge multilocular cystic tumor with solid components was seen in the lower abdominal and pelvic cavity. Thickened cyst wall had low intensity on T2-weighted images, which suggested abundant fibrous tissue. Its mural nodules were strongly enhanced on contrast(More)
A 75-year-old man, in whom upper gastrointestinal endoscopy revealed a submucosal tumor in the greater curvature of the gastric angle, was hospitalized for further investigations. Since the tumor was shown to be located in the submucosal layer by endoscopic ultrasonography, we performed endoscopic mucosal resection. Pathological studies of the resected(More)
  • 1