Search

Your search keyword '"Kawaguchi, Masaya"' showing total 250 results
Start Over Author "Kawaguchi, Masaya"
250 results on '"Kawaguchi, Masaya"'

21. FDG uptake in the cervical muscles after neck dissection: imaging features and postoperative natural course on 18F‑FDG‑PET/CT.

Author

Iritani, Yukako, Kato, Hiroki, Kaneko, Yo, Ishihara, Takuma, Ando, Tomohiro, Kawaguchi, Masaya, Shibata, Hirofumi, Ogawa, Takenori, Noda, Yoshifumi, Hyodo, Fuminori, and Matsuo, Masayuki

Abstract

Purpose: This study aimed to assess the imaging features and postoperative natural course of 18F-fluorodeoxyglucose (FDG) uptake in the cervical muscles after neck dissection. Materials and methods: This study included 83 patients who underwent preoperative and postoperative 18F-FDG-PET/CT and were diagnosed with head and neck malignancy after neck dissection. Postoperative 18F-FDG-PET/CT was performed within 5 years after neck dissection. Preoperative and postoperative FDG uptake of the trapezius, sternocleidomastoid, scalene, pectoralis major, and deltoid muscles was visually assessed. Increased postoperative uptake was visually defined as higher postoperative FDG uptake than the preoperative one in the corresponding muscle. The maximum standardized uptake value (SUVmax) was measured in cases with increased postoperative uptakes. Results: Increased postoperative uptakes were observed in 43 patients (52%). The trapezius (31/83, 37%), sternocleidomastoid (19/83, 23%), and scalene (12/83, 14%) muscles were involved, as opposed to the pectoralis major and deltoid muscles were not. Increased postoperative uptakes were observed on the dissected side in all 43 patients. Significant differences between SUVmax estimated from the mixed-effects model and postoperative months were observed in the trapezius muscle (Coefficient (β) = −0.038; 95% confidence interval (CI): [−0.047, −0.028]; p < 0.001) and sternocleidomastoid muscle (β = −0.015; 95% CI: [−0.029, −0.001]; p = 0.046). Conclusions: Increased postoperative uptakes in the cervical muscles were observed on the dissected side in approximately half of the patients after neck dissection. The SUVmax in the trapezius and sternocleidomastoid muscles decreased after surgery over time. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

22. Assessment of Arterial Involvement in Pancreatic Cancer: Utility of Reconstructed CT Images Perpendicular to Artery.

Author

Noda, Yoshifumi, Kobayashi, Kazuhiro, Kawaguchi, Masaya, Ando, Tomohiro, Takai, Yukiko, Suto, Taketo, Iritani, Yukako, Ishihara, Takuma, Fukada, Masahiro, Murase, Katsutoshi, Kawai, Nobuyuki, Kaga, Tetsuro, Miyoshi, Toshiharu, Hyodo, Fuminori, Kato, Hiroki, Miyazaki, Tatsuhiko, Matsuhashi, Nobuhisa, Yoshida, Kazuhiro, and Matsuo, Masayuki

Subjects
ARTERIOGRAPHY, DIAGNOSTIC imaging, COMPUTED tomography, RETROSPECTIVE studies, DESCRIPTIVE statistics, PANCREATIC tumors, COMPUTER-aided diagnosis, MEDICAL records, ACQUISITION of data, PANCREATECTOMY, DIGITAL image processing, CONFIDENCE intervals, CONTRAST media, SPLENIC artery
Abstract

Simple Summary: The diagnostic performance and interobserver variability of the contrast-enhanced CT currently used for evaluating arterial involvement from pancreatic cancer has limitations. The purpose of this study was to investigate the utility of reconstructed CT images perpendicular to the artery for assessing arterial involvement from pancreatic cancer and to compare the interobserver variability between it and the current diagnostic imaging method. We found that reconstructed CT images perpendicular to the splenic artery were feasible and showed less interobserver variability than current diagnostic method images. The purpose of this study was to investigate the utility of reconstructed CT images perpendicular to the artery for assessing arterial involvement from pancreatic cancer and compare the interobserver variability between it and the current diagnostic imaging method. This retrospective study included patients with pancreatic cancer in the pancreatic body or tail who underwent preoperative pancreatic protocol CT and distal pancreatectomy. Five radiologists used axial and coronal CT images (current method) and perpendicular reconstructed CT images (proposed method) to determine if the degree of solid soft-tissue contact with the splenic artery was ≤180° or >180°. The generalized estimating equations were used to compare the diagnostic performance of solid soft-tissue contact >180° between the current and proposed methods. Fleiss' ĸ statistics were used to assess interobserver variability. The sensitivity and negative predictive value for diagnosing solid soft-tissue contact >180° were higher (p < 0.001 for each) and the specificity (p = 0.003) and positive predictive value (p = 0.003) were lower in the proposed method than the current method. Interobserver variability was improved in the proposed method compared with the current method (ĸ = 0.87 vs. 0.67). Reconstructed CT images perpendicular to the artery showed higher sensitivity and negative predictive value for diagnosing solid soft-tissue contact >180° than the current method and demonstrated improved interobserver variability. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

50. Prognostic value of 18F-FDG PET/CT and MRI features in patients with high-risk and very-high-risk cutaneous squamous cell carcinoma

Author

Kawaguchi, Masaya, Kato, Hiroki, Matsuyama, Kanako, Noda, Yoshifumi, Hyodo, Fuminori, and Matsuo, Masayuki

Subjects
Skin Neoplasms, Full Paper, Fluorodeoxyglucose F18, Positron Emission Tomography Computed Tomography, Positron-Emission Tomography, Carcinoma, Squamous Cell, Humans, Radiology, Nuclear Medicine and imaging, General Medicine, Radiopharmaceuticals, Prognosis, Magnetic Resonance Imaging, Retrospective Studies
Abstract

Objective: This study aimed to evaluate the prognostic value of 18F-fludeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT) and MRI features in patients with high-risk and very-high-risk cutaneous squamous cell carcinoma (cSCC). Methods: This study included 54 consecutive patients with surgically resected primary high-risk and very-high-risk cSCC who underwent pre-operative FDG-PET/CT and/or MRI. Among them, 14 patients (26%) had recurrences. We retrospectively reviewed the FDG-PET/CT (n = 34) and MRI (n = 48) and investigated the clinical significance and prognostic value of imaging features in cSCC. Results: On FDG-PET/CT, the maximum standardized uptake value (SUVmax) of the primary tumor (13.0 ± 6.4 vs. 6.9 ± 5.3, p < 0.05) was higher in cSCC with recurrence than in cSCC without recurrence. On MRI, the maximum diameter of the lesion (46.8 ± 24.1 mm vs 30.4 ± 17.0 mm, p < 0.05) and the frequency of muscle/tendon/bone invasion (42% vs 11%, p < 0.05) were significantly greater in cSCC with recurrence than in cSCC without recurrence. In the univariate analysis, prognostic factors for recurrence were SUVmax of the primary tumor (p < 0.01), the maximum diameter of the lesion (p < 0.05), and depth of invasion (p < 0.05). The areas under the receiver operating characteristic curves of the SUVmax (0.78) were superior to those of the maximum diameter (0.71) and depth of invasion (0.60). Conclusion: SUVmax, maximum diameter, and depth of invasion were useful parameters for prognostic factors predicting recurrence in patients with high-risk and very-high-risk cSCC. Advances in knowledge: SUVmax represents a prognostic factor.

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results