On the Norlund Summability of Laguerre Series

Article信州大学工学部紀要 31: 1-8 (1971)departmental bulletin pape

On the Summability |N, Pn| of a Fourier Series

Article信州大学工学部紀要 27: 1-8 (1969)departmental bulletin pape

On some Theorems concerning the Summability N, Pn

Article信州大学工学部紀要 28: 7-14 (1970)departmental bulletin pape

On the Absolute Cesaro Summability Factors of Fourier Series

Article信州大学工学部紀要 28: 1-6 (1970)departmental bulletin pape

On the Absolute Summability Factors of Fourier Series

Article信州大学工学部紀要 31: 9-22 (1971)departmental bulletin pape

On the Absolute Norlund Summability of Fourier Series

Article信州大学工学部紀要 35: 1-6 (1973)departmental bulletin pape

Sacral Fracture Causing Neurogenic Bladder: A Case Report

A 76-year-old man presented with a Denis Zone III sacral fracture after a traffic accident. He also developed urinary retention and perineal numbness. The patient was diagnosed with neurogenic bladder dysfunction caused by the sacral fracture. A computed tomogram (CT) revealed that third sacral lamina was fractured and displaced into the spinal canal, but vertebral body did not displace. The fracture lines began at the center of lamina and extended bilateraly. The fracture pattern was unique. The sacrum was osteoporosis, and this fracture may be based on osteoporosis. We performed laminectomy to decompress sacral nerve roots. One month after surgery, the patient was able to urinate. Three months after surgery, his bladder function recovered normally. One year after surgery, he returned to a normal daily life and had no complaints regarding urination. One-year postoperative CT showed the decompressed third sacrum without displacement

The Specific Sagittal Magnetic Resonance Imaging of Intradural Extra-Arachnoid Lumbar Disc Herniation

Intradural extra-arachnoid lumbar disc herniation is a rare disease. Few MRI findings have been reported. We experienced an intradural extra-arachnoid lumbar disc herniation. We reviewed the preoperative MRI findings. Lumbar spine T2-weighted sagittal MRI showed that one line of the ventral dura was divided into two by a disc herniation. We speculated that the two lines comprised the dura and arachnoid and that a disc herniation existed between them. We believe that division of the ventral dural line on T2-weighted sagittal images is a characteristic finding of intradural extra-arachnoid lumbar disc herniation. The division of ventral dural line seemed to be a “Y,” and, thus, we called it the “Y sign.” The “Y sign” may be useful for diagnosing intradural extra-arachnoid lumbar disc herniation