Yoshiaki Katada

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The purpose of this study was to evaluate the feasibility and potential usefulness of unenhanced magnetic resonance (MR) hepatic portal perfusion using arterial spin labeling (ASL) among healthy volunteers and hepatocellular carcinoma patients. The five healthy volunteers underwent unenhanced MR perfusion with inversion time 2 (TI2) values at 500-ms(More)
INTRODUCTION Soft-tissue perineuriomas are rare benign peripheral nerve sheath tumors in the subcutis of the extremities and the trunks of young patients. To our knowledge, this the first presentation of the computed tomography and magnetic resonance imaging of a soft-tissue perineurioma in the retroperitoneum with pathologic correlation. CASE(More)
PURPOSE To investigate the feasibility of perfusion imaging using an arterial spin labeling (ASL) technique for breast cancer. MATERIALS AND METHODS Thirteen female patients with primary breast cancers were included in this study. All examinations were performed on 1.5 Tesla MRI systems. Visual evaluations of the colored perfusion map and MRI perfusion(More)
PURPOSE To demonstrate a coaxial needle technique for direct percutaneous puncture embolization of type II endoleaks. TECHNIQUE The technique is demonstrated in a 79-year-old woman and an 80-year-old man who developed type II endoleaks after endovascular repair of thoracic and internal iliac artery aneurysms, respectively. Expansion of the aneurysms(More)
Congenital aneurysms of the thoracic venous system are rare. In particular, innominate venous aneurysms are extremely rare. We describe a 16-year-old girl whose chest x-ray suggested a mediastinal tumor. Three-dimensional contrast-enhancement magnetic resonance venography showed a giant sacciform aneurysm of the left innominate vein and dilatation of the(More)
INTRODUCTION Alexander disease is a rare disorder resulting from a glial fibrillary acidic protein gene mutation which causes progressive degeneration of white matter. With the usual poor prognosis, there are few case reports with long-term follow-up. We report the five-year clinical course of Alexander disease in one case using serial magnetic resonance(More)
BACKGROUND Total arch replacement and ascending aorta and arch replacement are the gold standard treatments for aortic arch aneurysm and are possible treatment strategies for chronic type A dissection, with good reported outcomes. However, because total arch replacement is extremely invasive, it can be difficult to perform in some patients. We designed an(More)
Many of saccular aortic arch aneurysms exist near left subclabian artery(LSA). The thoracic endovascular aneurysm repair( TEVAR) landing on zone 2 is a less invasive and suitable procedure for this type of aneurysm. However, there are several cases with the aneurysm located close to LSA necessitate landing TEVAR on zone 1 or zone 0, otherwise the aneurysm(More)
Renal AML complicating tuberous sclerosis shows a rapid growth and its rupture is frequently associated with hemorrhagic shock as a result of profuse retroperitoneal bleeding, necessitating an aggressive therapeutic approach. This report describes the long-term clinical progress of 28 year-old woman with tuberous sclerosis with a ruptured giant AML that(More)