Hiroo Yabe

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Primary spinal primitive neuroectodermal tumors (PNETs) are very rare conditions. Most of these tumors occur in children and young adults. A 63-year-old man with a primary spinal PNET in the conus medullaris from the L1 to L2 level is presented in this report. The optimal treatment of primary spinal PNETs is yet unknown. Surgical resection, radiation(More)
Myxoid/round cell liposarcoma (MRCL), unlike other soft tissue sarcomas, has been associated with unusual pattern of metastasis to extrapulmonary sites. In an attempt to elucidate the clinical features of MRCL with metastatic lesions, 58 cases, from the medical database of Keio University Hospital were used for the evaluation. 47 patients (81%) had no(More)
Distortion analysis in the frequency domain is very important for designing the analog integrated circuits. We propose here a new method based on the SPICE-oriented harmonic balance method, where the Fourier transformations to the bipolar transistors and/or MOSFETs are carried out using new Fourier transfer circuit model. The circuit is composed of the(More)
INTRODUCTION Desmoplastic fibroblastoma (collagenous fibroma) is a recently described tumor thought to arise predominantly from subcutaneous tissue or skeletal muscle. The natural evolution of this tumor on magnetic resonance imaging has never been described, to the best of our knowledge. We herein report a case of desmoplastic fibroblastoma arising in the(More)
Excision is the treatment of choice in cases of sacral chordoma. Local recurrences, however, have often been observed even after total en bloc resection. The authors assessed outcomes in four cases of tumor recurrence in patients who underwent total en bloc S2-3 resection for sacral chordomas that were located below S-3. The primary recurrences were located(More)
In two patients with primary bone lymphoma (PBL) treated in our clinic, serum levels of soluble interleukin-2 receptor (sIL-2R) reflected the clinical course. In both cases, sIL-2R levels were high before treatment and normalized with the therapeutic effects of chemotherapy, coinciding with the changes in lactate dehydrogenase levels and radiographic(More)
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