Shuji Nishikawa
Osaka Medical College
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Featured researches published by Shuji Nishikawa.
Acta Oto-laryngologica | 2009
Ryo Kawata; Lee Koutetsu; Katsuhiro Yoshimura; Shuji Nishikawa; Hiroshi Takenaka
Conclusions: Elective neck dissection (END) may not be necessary in patients with low-grade malignancy. However, currently, END should be performed in all patients with parotid carcinoma because the preoperative diagnosis of lymph node metastasis is limited and the accuracy of preoperative grade diagnosis is low. Objective: Our aim was to examine the indication for END in N0 patients and the extent of dissection by investigating the accuracy of diagnosing the grade and lymph node metastasis of parotid carcinoma. Patients and methods: The subjects were 77 patients with parotid carcinoma. Among N0 patients, modified radical neck dissection (MRND) was conducted in those in whom the histological grade was evaluated as high, and selective neck dissection (SND) in other patients. Results: Lymph node metastasis was detected in 27 of 71 patients who underwent neck dissection. Node metastasis was detected in 19 (61.3%) of 31 patients in whom high-grade malignancy was suggested and in 8 (22.9%) of 35 patients in whom intermediate-grade malignancy was suggested preoperatively. There was no metastasis in any of the five patients in whom low-grade malignancy was suggested. Occult metastasis was noted in 8 of 51 patients. The rate at which the histological grade was accurately diagnosed before surgery was low, especially in patients with low-grade malignancy.
Acta Oto-laryngologica | 2009
Koutetsu Lee; Ryo Kawata; Shuji Nishikawa; Katsuhiro Yoshimura; Hiroshi Takenaka
Conclusion: Considering the incidence of metastasis from papillary thyroid carcinoma (PTC) with respect to the lateral cervical regions and limited detection on preoperative ultrasonography (US), level II to IV dissection may be essential when lateral node metastasis (LNM) is detected on preoperative US. Objectives: LNM is frequent in patients with PTC. However, a consensus regarding its preoperative diagnosis and the indication/extent of lateral node dissection (LND) has not been reached. We prepared criteria for diagnosing LNM from PTC using US. Furthermore, we investigated the usefulness and limits of US and appropriate extent of dissection. Patients and methods: We conducted a retrospective study in 70 patients with PTC (80 sides) in whom LNM was detected preoperatively, and level II to V LND was performed. We compared the results of the preoperative diagnosis of LNM using US in accordance with the criteria with those of histopathological diagnosis after LND. Results: Diagnostic criteria for LNM were a minor axis of 6 mm or more and a minor/major axis ratio of 0.5 or more. Histopathologically, metastasis was detected in 467 lymph nodes. Of these, 199 (43%) were detected on US, and met the diagnostic criteria.
Head and Neck-journal for The Sciences and Specialties of The Head and Neck | 2013
Masaaki Higashino; Ryo Kawata; Shin-Ichi Haginomori; Koutetsu Lee; Katsuhiro Yoshimura; Takaki Inui; Shuji Nishikawa
The purpose of this study was to prepare the ultrasonographic diagnostic criteria on parotid tumors for preoperative differentiation of superficial and deep tumors.
Auris Nasus Larynx | 2015
Shuji Nishikawa; Ryo Kawata; Masaaki Higashino; Koutetsu Lee; Tetsuya Terada; Yoshitaka Kurisu; Motomu Tsuji
OBJECTIVE The aim of this study is to compare preoperative fine needle aspiration cytology (FNAC) and intraoperative frozen section (FS) for the correct identification of malignancy, histological grade, and histological type. METHODS FNAC was performed on all 105 patients and FS on 71 patients with parotid carcinoma. RESULTS The rate of correctly determining the histological grade by FNAC and FS was 32% and 73%, respectively. The correct diagnosis rate for both the histological type and grade by FNAC and FS was 20% and 48%, respectively. CONCLUSIONS The correct grading of both high and low/intermediate grade carcinoma is possible in 70-80% of patients by FS. If the histological grade is identified correctly, the extent of resection can usually be decided appropriately. Therefore, we should put emphasis on determining the histological grade.
Auris Nasus Larynx | 2014
Masaaki Higashino; Ryo Kawata; Koutetsu Lee; Shuji Nishikawa; Shimpei Ichihara; Yasuo Uesugi
OBJECTIVE We examined the completion rate, safety, and adverse events in patients with T2N0 glottic carcinoma who received chemoradiotherapy with S-1 (tegafur-gimeracil-oteracil potassium). METHODS In T2N0 glottic carcinoma patients, we retrospectively compared the local control rate and outpatient therapy completion rate between 20 patients who received radiotherapy plus S-1 (S-1 group) and 20 who received radiotherapy alone (RT group). RESULTS Local recurrence was not detected in any of the 20 subjects from the S-1 group, whereas local recurrence was found in 4 of the 20 subjects (20%) from the RT group (p<0.05). Outpatient treatment was completed by 15 of the 20 subjects from the S-1 group and 17 of the 20 subjects from the RT group (p=0.43). CONCLUSION We investigated chemoradiotherapy with S-1 in patients who had T2N0 glottic carcinoma and found a higher local control rate when compared with radiotherapy alone as well as comparable safety for outpatient delivery.
Acta Oto-laryngologica | 2011
Koutetsu Lee; Shuji Nishikawa; Katsuhiro Yoshimura; Ryo Kawata
Abstract Conclusion: The occult metastasis rate for T2 oral cancer can be reduced by ultrasonography (US). Also, the late metastasis rate is considered to be reduced by combining US with frozen section biopsy (FSB) during supraomohyoid neck dissection (SOHND). Objectives: Early oral cancer has been reported to show occult metastases in 15–53% of patients, but the criteria or methods for the diagnosis of cervical lymph node metastasis are unclear in many studies, and there is no clear definition of occult metastasis. In patients with T2 oral cancer, the diagnosis of lymph node metastasis by US and its pathological diagnosis (pN) after neck dissection were compared to evaluate the usefulness and limitations of US, occult metastasis rate, significance of SOHND as preventive neck dissection, and use of FSB. Methods: A total of 73 patients with T2 oral cancer were investigated retrospectively. Modified radical neck dissection (MRND) was performed in N+ patients, and SOHND was carried out in N0 patients. FSB was performed in all patients undergoing SOHND. US and pN diagnoses were compared. Results: The occult metastasis rate was 18% when occult metastases were limited to those detected by SOHND and 22% when late nodal recurrences were also included.
Nihon Kikan Shokudoka Gakkai Kaiho | 2013
Keiko Hasegawa; Shimpei Ichihara; Shuji Nishikawa; Masaaki Higashino; Koutetsu Lee; Ryo Kawata
Practica oto-rhino-laryngologica | 2012
Yusuke Oku; Kotetsu Lee; Shuji Nishikawa; Ryo Kawata; Yoshitaka Kurisu; Motomu Tsuji
Practica oto-rhino-laryngologica | 2018
Keiki Noro; Akiko Ozaki; Shuji Nishikawa; Masaaki Higashino; Tetsuya Terada; Yoshitaka Kurisu; Ryo Kawata
THE LARYNX JAPAN | 2017
Masaaki Higashino; Shuji Oomura; Norio Suzuki; Shuji Nishikawa; Ryo Kawata