Polymer gels are three-dimensional dosimetric tools. The purpose of the present study was to investigate the temperature dependence of polymer gels during scanning Magnetic Resonance Imaging. Prepared gels were irradi...Polymer gels are three-dimensional dosimetric tools. The purpose of the present study was to investigate the temperature dependence of polymer gels during scanning Magnetic Resonance Imaging. Prepared gels were irradiated with a 6MV X-ray beam at intensities ranging from 0 to 20 Gy in order to investigate their dose-R2 and dose-R1 responses. Irradiated gels were evaluated from 1.5-T magnetic resonance R2 and R1 images for each 5°C change in temperature from 5°C to 41°C, and then the four-field box technique irradiation plan was used to deliver a total dose of 4 Gy using the same beam weight in each direction to the prepared gels. The profile of the dose map generated from the four-field irradiated gel data at 20°C was then compared with the planned data. The dose-R2 response curve was linear up to 20 Gy at 20°C, with a slope of 1.17 Gy-1˙s-1. The slopes of the fitted curves of the dose-R2 decreased as gel temperature increased. The slopes of the dose-R1 curves were more parallel than the slopes of the dose-R2 curves between 5 and 41°C. The difference in the full width of half maximum of the gel profile data obtained using the four-field box technique at 20°C and the planned data were below 5% on average. The dose map from the irradiated gels obtained using the dose-R2 curve was the same as that from the planned data under the same temperature conditions. Measurement of difference between various temperatures is significant with dose accuracy. It is suitable to evaluate the gel dosimeter under the thermal equilibrium condition, MRI room temperature from the point of view of the stability of the irradiated gels.展开更多
Background: Cervical schwannoma is a relatively rare disease, and it is difficult to experience many surgical cases because it may be followed up without surgery. We examined 100 patients who underwent inter-capsular ...Background: Cervical schwannoma is a relatively rare disease, and it is difficult to experience many surgical cases because it may be followed up without surgery. We examined 100 patients who underwent inter-capsular resection for cervical schwannomas at our center and classified the patients according to the nerve of origin. Methods: We retrospectively reviewed 100 patients who underwent inter-capsular resection for cervical schwannoma at our center from April 2005 to September 2019. We examined the patient’s characteristics including age, sex, tumor size (maximum diameter), origin nerve, preoperative symptoms, and postoperative neurological deficits for all cases. We classified the cases according to the nerve of origin and the occurrence of postoperative neurological deficits. Results: The occurrence of postoperative neurological deficit for all cases was as follows: “none” was 73%, “temporary paralysis” was 21%, and “permanent paralysis” was 6%. In the case of vagus nerve: “none” was 65.4%, “temporary paralysis” was 23.1%, “permanent paralysis” was 11.5%. In the case of sympathetic nerve: “none” was 64.7%, “temporary paralysis” was 29.4%, “permanent paralysis” was 5.9%. In the case of brachial plexus: “none” was 87.0%, “temporary paralysis” was 13.0%, “permanent paralysis” was 0%. In the case of cervical and accessory nerves: “none” was 86.4%, “temporary paralysis” was 13.6%, “permanent paralysis” was 0%. In the case of facial nerve: “none” was 0%, “temporary paralysis” was 80.0%, “permanent paralysis” was 20%. In the case of lingual nerve: “none” was 80.0%, “temporary paralysis” was 20.0%, “permanent paralysis” was 0%. Conclusions: Inter-capsular resection is useful for the treatment of cervical schwannoma and a simple comparison is difficult, but probably with good results. This study provides information that will be useful for the treatment of cervical schwannoma.展开更多
Metastatic lung tumours rarely lead to development of pneumothorax, and no case of bilateral secondary pneumothorax due to lung metastases arising from tongue cancer has been reported. Here, we report a case of a pati...Metastatic lung tumours rarely lead to development of pneumothorax, and no case of bilateral secondary pneumothorax due to lung metastases arising from tongue cancer has been reported. Here, we report a case of a patient with tongue cancer with lung metastases complicated by bilateral secondary pneumothorax soon after the completion of concurrent chemoradiotherapy. A 39-year-old man with cervical lymph node metastases originating from pT2N0M0 tongue cancer underwent neck dissection and postoperative concurrent chemoradiotherapy. Shortly after the completion of chemoradiotherapy, he developed bilateral secondary pneumothorax. Subsequently, he underwent partial lung resection for the pulmonary fistulae for diagnostic and therapeutic purposes;nodular lesions found in both the lungs. The diagnosis of secondary pneumothorax was based on histopathological findings. Although all pulmonary fistulae disappeared after partial lung resection, he died of the primary disease despite our best efforts to control the metastatic pulmonary lesions.展开更多
文摘Polymer gels are three-dimensional dosimetric tools. The purpose of the present study was to investigate the temperature dependence of polymer gels during scanning Magnetic Resonance Imaging. Prepared gels were irradiated with a 6MV X-ray beam at intensities ranging from 0 to 20 Gy in order to investigate their dose-R2 and dose-R1 responses. Irradiated gels were evaluated from 1.5-T magnetic resonance R2 and R1 images for each 5°C change in temperature from 5°C to 41°C, and then the four-field box technique irradiation plan was used to deliver a total dose of 4 Gy using the same beam weight in each direction to the prepared gels. The profile of the dose map generated from the four-field irradiated gel data at 20°C was then compared with the planned data. The dose-R2 response curve was linear up to 20 Gy at 20°C, with a slope of 1.17 Gy-1˙s-1. The slopes of the fitted curves of the dose-R2 decreased as gel temperature increased. The slopes of the dose-R1 curves were more parallel than the slopes of the dose-R2 curves between 5 and 41°C. The difference in the full width of half maximum of the gel profile data obtained using the four-field box technique at 20°C and the planned data were below 5% on average. The dose map from the irradiated gels obtained using the dose-R2 curve was the same as that from the planned data under the same temperature conditions. Measurement of difference between various temperatures is significant with dose accuracy. It is suitable to evaluate the gel dosimeter under the thermal equilibrium condition, MRI room temperature from the point of view of the stability of the irradiated gels.
文摘Background: Cervical schwannoma is a relatively rare disease, and it is difficult to experience many surgical cases because it may be followed up without surgery. We examined 100 patients who underwent inter-capsular resection for cervical schwannomas at our center and classified the patients according to the nerve of origin. Methods: We retrospectively reviewed 100 patients who underwent inter-capsular resection for cervical schwannoma at our center from April 2005 to September 2019. We examined the patient’s characteristics including age, sex, tumor size (maximum diameter), origin nerve, preoperative symptoms, and postoperative neurological deficits for all cases. We classified the cases according to the nerve of origin and the occurrence of postoperative neurological deficits. Results: The occurrence of postoperative neurological deficit for all cases was as follows: “none” was 73%, “temporary paralysis” was 21%, and “permanent paralysis” was 6%. In the case of vagus nerve: “none” was 65.4%, “temporary paralysis” was 23.1%, “permanent paralysis” was 11.5%. In the case of sympathetic nerve: “none” was 64.7%, “temporary paralysis” was 29.4%, “permanent paralysis” was 5.9%. In the case of brachial plexus: “none” was 87.0%, “temporary paralysis” was 13.0%, “permanent paralysis” was 0%. In the case of cervical and accessory nerves: “none” was 86.4%, “temporary paralysis” was 13.6%, “permanent paralysis” was 0%. In the case of facial nerve: “none” was 0%, “temporary paralysis” was 80.0%, “permanent paralysis” was 20%. In the case of lingual nerve: “none” was 80.0%, “temporary paralysis” was 20.0%, “permanent paralysis” was 0%. Conclusions: Inter-capsular resection is useful for the treatment of cervical schwannoma and a simple comparison is difficult, but probably with good results. This study provides information that will be useful for the treatment of cervical schwannoma.
文摘Metastatic lung tumours rarely lead to development of pneumothorax, and no case of bilateral secondary pneumothorax due to lung metastases arising from tongue cancer has been reported. Here, we report a case of a patient with tongue cancer with lung metastases complicated by bilateral secondary pneumothorax soon after the completion of concurrent chemoradiotherapy. A 39-year-old man with cervical lymph node metastases originating from pT2N0M0 tongue cancer underwent neck dissection and postoperative concurrent chemoradiotherapy. Shortly after the completion of chemoradiotherapy, he developed bilateral secondary pneumothorax. Subsequently, he underwent partial lung resection for the pulmonary fistulae for diagnostic and therapeutic purposes;nodular lesions found in both the lungs. The diagnosis of secondary pneumothorax was based on histopathological findings. Although all pulmonary fistulae disappeared after partial lung resection, he died of the primary disease despite our best efforts to control the metastatic pulmonary lesions.
