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4. Output Behavior of Fall Detection Sensor Using Brush-Based Triboelectric Nanogenerator Depending on Fiber Characteristics.

Author

Komatsu, Tomohiro, Uejima, Rino, Shima, Shota, Uchiyama, Yuji, Kobayashi, Eiichi, Takamura, Eiichiro, and Sakamoto, Hiroaki

Subjects
OLDER people, POLYMER films, DETECTORS, FRICTION materials, CONTACT angle
Abstract

In Japan, a huge portion of the population is aged people, who are prone to various diseases and injuries on a regular basis. Injuries due to falls are one of the biggest risk factors. Consequently, the demand for fall detection sensors, especially the ones that used a triboelectric nanogenerator (TENG) has recently increased. In a previous study, our group reported the development of a wearable sensor for fall detection with privacy protection using the principle of TENG. Conventional TENGs use polymer films as friction material. However, it is difficult for film-based TENGs to harvest output from various angles of contact separation, as the films have two-dimension structures. Consequently, our previous study focused on developing brush-based TENG (B-TENG), and B-TENG harvested output from various angles of contact-separation. However, the B-TENGs we developed were not sensitive enough to detect signals of lower contact force, and thereby could not be used in fall detection sensors. In this study, we focused on improving the performance of B-TENG by investigating the properties of the brushes and the effect of various external parameters on the harvested output voltage of B-TENGs. Consequently, we have constructed an optimized B-TENG, which harvests almost 18 times higher output voltage than the previous one developed by our group. Thus, this optimized B-TENG has the potential for practical use in fall detection sensors. [ABSTRACT FROM AUTHOR]

Published
2023
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10. Abstracts for the 6th Congress of Asian Sleep Research Society

Author

Kim, Seog Ju, Lyoo, In Kyoon, Lee, Yu-Jin, Jeong, Do-Un, Kanai, Hirohiko, Ookubo, Masanori, Yoshimura, Atsushi, Okawa, Masako, Yamada, Noto, Munezawa, Takeshi, Kaneita, Yoshitaka, Osaki, Yoneatsu, Kanda, Hideyuki, Ohtsu, Tadahiro, Minowa, Masumi, Suzuki, Kenji, Hijuchi, Susumu, Suzuki, Hiroyuki, Ohida, Takashi, Abe, Takashi, Komada, Yoko, Asaoka, Shoichi, Inoue, Yuichi, Lee, Jin-Seong, Cho, Sang-Yong, Kumar, Deependra, Mallick, Hruda N., Kumar, Velayudhan M., Kaushik, Mahesh K., Karashima, Akihiro, Katayama, Noiihiro, Nakao, Mitsuyuki, Nagendra, Ravindra P., Sulekha, Sathiamma, Narasappa, Sathyaprabha T., Nityanadan, Pradhan, Kutty, Bindu M., Nirmala, M., Ravindra, P. N., Tubaki, Basavaraj Ramappa, Sathyaprabha, T. N., Sudhakar, D., Lavekar, G. S., Chandrashekar, C. R., Kitaoka, Kazuyoshi, Shimizu, Mika, Chikahisa, Sachiko, Yoshizaki, Kazuo, Sei, Hiroyoshi, Kim, Jong-Won, Takegami, Misa, Yamazaki, Shin, Hayashino, Yasuaki, Ono, Rei, Otani, Koji, Sekiguchi, Miho, Konno, Shinichi, Fukuhara, Shunichi, Jakobson, Antonia J., Fitzgerald, Paul, Conduit, Russell, Li, Xin Shirley, Lam, Siu Ping Joyce, Yu, Wai Man Mandy, Wing, Yun Kwok, Okamoto-Mizuno, Kazue, Mizuno, Koh, Yamamoto, Mituaki, Shirakawa, Shuichiro, Doi, Hirokazu, Kato, Mikako, Shinohara, Kazuyuki, Tamaki, Masako, Matsuda, Shiori, Yamazaki, Katsuo, Hori, Tadao, Ogawa, Keiko, Takahashi, Kazumi, Kitahama, Kunio, Yamazaki, Katuo, Koyama, Yoshimasa, Shioda, Kohei, Ueda, Yugo, Nakamura, Yukiko, Inoue, Clara, Goto, Kazushige, Uchida, Sunao, Morita, Yuko, Honda, Yoshiko, Kodama, Tohru, Hagihara, Mari, Nakajima, Toru, Saito, Masato, Koga, Yoshihiko, Tanaka, Shinichiro, Yamadera, Hiroshi, Takahara, Madoka, Suwa, Sachiko, Onozuka, Minoru, Sato, Sadao, Togo, Fumiharu, Komatsu, Taiki, Mitani, Takeshi, Choi, Jongbae, Zhang, Bin, Sasai, Taeko, Mitsubayashi, Hiromi, Ohtsu, Mitsuhiro, Hasegawa, Isao, Ishii, Tatsuya, Komori, Akira, Suzuki, Asami, Nakahara, Yue, Hiroki, Mitsuyasu, Nakauma, Mariko, Someya, Nobuo, Ochiai, Tomomasa, Komori, Shouhei, Chiang, Rayleigh Ping-Ying, Yeh, Zai-Ting, Kim, Seong T., Yoon, Seung H., Kwon, Jeong S., Choi, Jong H., Ahn, Hyung J., Kim, Youngsoo, Yunren, Bolortuya, Chen, Lichao, Basheer, Radhika, Mccarley, Robert W., Strecker, Robert E., Honda, Makoto, Arai, Tetsuaki, Fukazawa, Miyuki, Honda, Yutaka, Tsuchiya, Kuniaki, Akiyama, Haruhiko, Mignot, Emmanuel, Jung, Ki-Young, Ko, Deokwon, Koo, Yong-Seo, Zhang, Jihui, Ping Lam, Siu, Hong, Seung Chul, Chung, Kyoo In, Lee, Sung Pil, Lee, Chung Tai, Seo, Ho Jun, Jeong, Jong Hyeon, Lim, Hyeon Kuk, Shin, Yoon Kyung, You, Ji Hee, Suzuki, Jun-Ichi, Ogawa, Masahito, Liu, Xianchen, Ye, Wenyu, Watson, Peter, Dube, Sanjay, Wohlreich, Madelaine, Kwan, Benjamin C. H., Joseph, Francoise, Mckenzie, David M., Lee, Bonne, Lee, Sang-Ahm, Lee, Eun-Mi, Kim, Cheon-Sik, Nishijima, Tsuguo, Sakurai, Shigeru, Tokunaga, Jun, Takahashi, Susumu, Kanbayashi, Takashi, Hitomi, Jirou, Shimizu, Tetsuo, Murashima, Koji, Ozaki, Masayuki, Hang, Liang-Wen, Lin, Chen-Liang, Huang, Cheng-Ning, Huang, Wen-Yen, Choi, Ji Ho, Kim, Eun Joong, Kim, Tae Hoon, Lee, Sang Hag, Shin, Chol, Lee, Seung Hoon, Chen, Chia Chi, Lo, Men-Tzung, Lin, Chen, Lee, Min-Ying, Lin, Chia-Mo, Tsuiki, Satoru, Kobayashi, Mina, Takashima, Akiyo, Maeda, Keiko, Matsuura, Masato, Furukawa, Tomokazu, Nakano, Hiroshi, Hirayama, Kenji, Tanahashi, Tokusei, Yoshihara, Kazufumi, Kubo, Chiharu, Sudo, Nobuyuki, Kim, Eui-Joong, Ahn, Young Min, Shin, Hong-Beom, Kim, Jong Won, Matsuo, Akira, Nakai, Takayuki, Tsuiki, Storu, Chiba, Higoshige, Sawada, Koki, Chiba, Shintaro, Endo, Makoto, Moriwaki, Hiroto, Uchida, Ryo, Kim, Sung Wan, Chung, Dae Han, Shin, Seung Youp, Lee, Kun Hee, Cho, Joong Saeng, Tazoe, Mari, Ayuse, Takao, Yamamura, Satoshi, Kirkness, Jason P., Oi, Kumiko, Ishida, Katsunori, Kato, Masahiko, Kato, Yosuke, Yanagihara, Kiyotaka, Kinugasa, Yoshiharu, Sugihara, Shinobu, Hirai, Masayuki, Hamada, Toshihiro, Igawa, Osamu, Hisatome, Ichiro, Shigemasa, Chiaki, Shimizu, Noriyuki, Oura, Masahiro, Usui, Akira, Okajima, Isa, Matsuura, Noriko, Hiroki, Ikeda, Mitsuo, Hayashi, Choi, Jiae, Yoon, Inyoung, Furutani, Maki, Takase, M., Nakayama, K., Kita, Y., Sakohara, T., Yoshimura, H., Satoki, Y., Sakai, Y., Murakami, A., Kouno, K., Ikeda, R., Tanaka, H., Tanaka, Hideki, Yamano, Emi, Fukuda, Sanae, Joudoi, Takako, Mizuno, Kei, Tanaka, Masaaki, Kawatani, Junko, Takano, Miyuki, Tomoda, Akemi, Imai-Matsumura, Kyoko, Miike, Teruhisa, Watanabe, Yasuyoshi, Furihata, Ryuji, Uchiyama, Makoto, Takahashi, Sakae, Suzuki, Masahiro, Konno, Chisato, Ohsaki, Kouichi, Chiang, Hsin Ju, Tsai, Ling Ling, Weng, Chia Ying, Kawauchi, Tomomi, Tanaka, Yuu, Ohira, Hideki, Na, Hae-Ran, Kang, Eun-Ho, Sim, Hyun-Bo, Woo, Jong-Min, Yu, Bum-Hee, Ahmed, Wael, Kitanaka, Takahiro, Nishimura, Yoichi, Ando, Kayoko, Kurahashi, Hiroki, Abe, Akiko, Yamamoto, Ryuichiro, Matsuda, Michikazu, Ogawa, Toru, Ito, Toshimi, Suzuki, Tasuku, Sasaki, Keiichi, Shinno, Hideto, Otsuki, Manabu, Tsuchiya, Satoshi, Oka, Yasunori, Kawada, Seiichi, Innami, Toshihiko, Horikoshi, Tatsuru, Sasaki, Akira, Hineno, Takashi, Sakamoto, Tetsuro, Inami, Yasushi, Yamashita, Hidehisa, Mizuno, Soichi, Nakamura, Yu, Horiguchi, Jun, Iwanaga, Koichi, Kanemura, Takashi, Ohno, Mikako, Kato, Yuichi, Miyazaki, Soichiro, Maritani, Shinji, Ito, Yukihiko, Shen, Manzhen, Takahashi, Satomi, Kajiwara, Nobuko, Satoh, Makoto, Kinouchi, Kaori, Tokuyama, Kana, Akai, Yukiko, Fukuyama, Tomoko, Takahashi, Hiroe, Tanbara, Tadashi, Nishihara, Kyoko, Ozawa, Nobuyuki, Shin, Duk, Sakai, Hiroyuki, Uchiyama, Yuji, Wakita, Toshihiro, Sugi, Takenao, Yoshiyama, Hiroaki, Matsuoka, Genya, Sakai, Kazuhiro, Nakamura, Masatoshi, Cho, Yong Won, Lee, Joo Hwa, Jung, Sang Hun, Cho, Hwa Ra, Yi, Sang Doe, Kobayashi, Masato, Moromugi, Shunji, Sakamoto, Taichi, Ishimatsu, Takakazu, Lee, Jeong Su, Chung, Gih Sung, Park, Kwang Suk, Shin, Won Chul, Yoon, Jung Eun, Jang, Eun Joo, Sung, Min Jee, Cha, Hyun Keuk, Taguchi, T., Nakamori, M., Taneike, R., Hayashi, A., Sugimori, S., Kamiyama, J., Hamada, T., Itoi, H., Koyama, Emi, Kubo, Tomohide, Takahashi, Masaya, Sato, Tomoaki, Sasaki, Takeshi, Oka, Tatsuo, Iwasaki, Kenji, Son, Mia, Yeom, Myeonggul, Harma, Mikko, Wakamura, Tomoko, Tojo, Chiaki, Horita, Sachiko, Takahashi, Ken-Ichi, Sumi, Kensuke, Nakayama-Ashida, Yukiyo, Nakamura, Takaya, Minami, Itunari, Oka, Yasunari, Chin, Kazuo, Kadotani, Hiroshi, Hayashi, Etsuko, Kato, Rumiko, Tanaka, Yu, Yamamoto, Takuro, Yamashita, Shiko, Matsumoto, Masahiro, Nakashima, Yusaku, Soma, Haruhiko, Yasuda, Akio, Kuriki, Ayano, Hayashi, Mituo, MurakI, Takeya, Yamashiro, Keitaro, Aritomi, Ryoji, Sakurai, Shihomi, Kishi, Akifumi, Natelson, Benjamin H., Struzik, Zbigniew R., Yamamoto, Yoshiharu, Terashima, Ryuta, Nakade, Miyo, Murata, Chiyoe, Hirai, Hiroshi, Kondo, Katsunori, Tsutsui, Hideyo, Tsuboi, Hirohito, Ojima, Toshiyuki, Fu, Ying-Hui, He, Ying, Jones, Christopher, Fujiki, Nobuhiro, Nishino, Seiji, Ito, Asao, Fredholm, Bertil B., Hillman, David R., Hayashi, Mitsuo, Kennaway, David J., Mallick, H. N., Hui, David S., Chee, Michael W. L., Takahashi, Toshiharu, Sasaki, Mitsuo, Gedal, Lalaine, Honma, Sato, Yoshikawa, Tomoko, Hashimoto, Satoko, Honma, Ken-Ichi, Lee, Li-Ang, Li, Hsueh-Yu, Tsai, Ling-Ling, Hsieh, Shulan, Zucconi, Marco, Yang, Chien-Ming, Lo, Hsiao-Sui, Wu, Chia-Suo, Huang, Yen-Ling, Tsai, Ming-Chieh, Han, Fang, Yoshida, Kazuya, Mcardle, Nigel, Jung, Chul Ho, Choi, Ji Hye, Soon, Park Chan, Sarte, Michael Alexius A., Wai, Talen, Sasao, Yasuhiro, Liu, Lianqi, Owens, Judith, Shrivastava, Deepak, Kanabayashi, Takashi, Hishikawa, Yasuo, Naughton, Matthew T., Miyamoto, Masayuki, Lam, Jamie C., Dworak, Markus, Kalinchuk, Anna, Kim, Tae, Brown, Ritchie, Strecker, Robert, Huang, Yu-Shu, Tsou, Meng-Chen, Hsu, Shih-Pin, Vachiramon, Amornpong, Nakata, Seiichi, Luppi, Pierre-Herve, Chen, Ning-Hung, Mallick, Birendra N., Hong, Seung Bong, Ho, Crover K., Goh, Yau Hong, Mark, Ignatius, Opp, Mark R., Sullivan, Colin E., Kim, Kwang-Jin, Preutthipan, Aroonwan, Strohl, Kingman P., Fuller, Patrick, Wang, Yang, Bhatia, Manvir, Lee, Chul Hee, and Bassetti, Claudio L.

Published
2009
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20. Human Visual and Auditory Information. Using a Color Simulator to Extract Colorimetric Factors Related to the Feeling of Depth Produced by Painted Panels

Author

Ishihara Toshikazu, Hiroyoshi Tsuji, Mikiko Kawasumi, and Uchiyama Yuji

Subjects
Feeling, Computer science, business.industry, media_common.quotation_subject, Media Technology, Auditory information, Computer vision, Artificial intelligence, Electrical and Electronic Engineering, business, Computer Science Applications, media_common
Published
1998

21. Association of physical activity and appetite with visual function related to driving competence in older adults.

Author

Takafumi Ando, Hiroyuki Sakai, Yuji Uchiyama, Ando, Takafumi, Sakai, Hiroyuki, and Uchiyama, Yuji

Subjects
HEALTH of older people, COGNITION disorders in old age, PHYSICAL activity, APPETITE, ACCELEROMETRY, EXERCISE & psychology, TRAFFIC accidents -- Psychological aspects, TRAFFIC safety, AUTOMOBILE driving, EXERCISE, NEUROPSYCHOLOGICAL tests, PSYCHOLOGY of movement, QUESTIONNAIRES, VISUAL perception, STANDARDS, PSYCHOLOGY
Abstract

Background: Older people are at greater risk of traffic accidents, partially because of age-related declines in visual function, including reduced useful field of view (UFOV). However, lifestyle factors which cause age-related decline in UFOV remain poorly understood. We conducted a study to investigate whether physical activity and appetite status were related to UFOV test performance in healthy older adults.Methods: Thirty community-dwelling older people (age 68.6 ± 3.1 years, 15 females) were enrolled in this study. Each participant completed the Council on Nutrition appetite questionnaire (CNAQ) and a UFOV test. They then wore a tri-axial accelerometer (Active style Pro HJA-350IT) for 3-6 consecutive days to objectively measure their PA in free-living conditions.Results: Longer time spent in vigorous physical activity was significantly associated with better UFOV test performance when adjusted for age and accelerometer wear time (non-locomotive: r = -0.435, locomotive: r = -0.449; n = 25). In addition, male, but not female, participants with a higher CNAQ score had significantly better UFOV test performance in both an unadjusted model (r = -0.560; n = 15) and a model adjusted for age (r = -0.635; n = 15).Conclusions: The results suggest that appetite status among males and time spent in high intensity PA are associated with visual function related to driving competence in older adults. [ABSTRACT FROM AUTHOR]

Published
2017
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46. A Cat-CVD Si3N4film study and its application to the ULSI process

Author

Uchiyama, Yuji, Masuda, Atsushi, and Matsumura, Hideki

Abstract

The feasibility of Si3N4films prepared by a catalytic chemical vapor deposition (Cat-CVD) method is studied with the idea of considering its applications to the ULSI process. In this study, SiNxfilms are prepared by Cat-CVD at various catalyzer temperatures, gas pressures and substrate temperatures. It was verified that the content of metal contamination is much lower than that permitted in a ULSI manufacture line. The maximum deposition rate reaches up to 132 nm/min, which is sufficiently higher than the deposition rate required for sidewall films near gate electrodes. The leakage current for SiNxfilms is lower than that for plasma enhanced CVD (PECVD) SiNxfilms. These features show that Cat-CVD SiNxfilms have the potential to be employed in the ULSI process.

Published
2001
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47. [A Case of Adenocarcinoma of Pancreatic Head of Liver Disfunction after Pancreaticoduodenectomy with Celiac Artery Stenosis Treated by Urgent Median Arcuate Ligament Release].

Author

Matsushita K, Yokoyama S, Hashimoto K, Uchiyama Y, Mizuno T, Kawai K, Kobayashi T, Saso K, Komori T, Kishi K, and Fukunaga M

Subjects
Humans, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Constriction, Pathologic surgery, Deoxycytidine analogs & derivatives, Deoxycytidine therapeutic use, Deoxycytidine administration & dosage, Drug Combinations, Gemcitabine, Median Arcuate Ligament Syndrome surgery, Oxonic Acid therapeutic use, Oxonic Acid administration & dosage, Tegafur therapeutic use, Tegafur administration & dosage, Adenocarcinoma surgery, Celiac Artery surgery, Pancreatic Neoplasms surgery, Pancreaticoduodenectomy
Abstract

This patient visited our hospital for the purpose of detailed examination of prostate cancer in his seventies. Abdominal contrast-enhanced computed tomography(CT)revealed a low-density mass of 2 cm in the pancreatic head. He was diagnosed with pancreatic cancer. Pancreaticoduodenectomy was performed after 2 courses of gemcitabine and S-1 therapy were performed as neoadjuvant chemotherapy. An intraoperative clamp test of the gastroduodenal artery showed that the pulsation of the common hepatic artery and the proper hepatic artery was weak but sufficient, so the gastroduodenal artery was cut and the operation was completed as planned. A blood test on the 1st day after the operation showed elevated levels of AST 537 U/L, ALT 616 U/L, and 7 hours later blood sampling showed further increases in AST 1,455 U/L, ALT 1,314 U/L. After a detailed review of the preoperative CT, celiac artery stenosis due to compression of the arcuate ligament was suspected, and urgent median arcuate ligament release was performed on the same day. Dissection of the arcuate ligament significantly improved the pulsation of the common hepatic artery and proper hepatic artery. Postoperatively, hepatic enzymes improved and ISGPS showed Grade B pancreatic juice leakage, but the patient was discharged from the hospital on the 49th postoperative day without any other complications. He took S-1 as adjuvant chemotherapy, and no signs of recurrence have been observed 9 months after the operation.

Published
2024

48. [A Case of Strangulated Bowel Obstruction after a Laparoscopic Hartmann's Operation for Rectal Cancer].

Author

Kawai K, Komori T, Saso K, Mizuno T, Uchiyama Y, Kobayashi T, Matsushita K, Kishi K, Yokoyama S, and Fukunaga M

Subjects
Female, Humans, Aged, 80 and over, Rectum surgery, Colon, Sigmoid surgery, Colostomy, Rectal Neoplasms complications, Rectal Neoplasms surgery, Intestinal Obstruction etiology, Intestinal Obstruction surgery, Laparoscopy methods
Abstract

A 98-year-old woman presented with hematochezia and a circumferential type 2 tumor in the rectum Rb identified on fiberoscopy. We a performed laparoscopic Hartmann's operation and D2 lymphadenectomy for advanced rectal cancer. A sigmoid colostomy was created via the intraperitoneal route. On the postoperative day 12, the patient experienced abdominal pain. Computed tomography showed that the small intestine formed a closed loop in the pelvic space. The patient was diagnosed with a strangulated bowel obstruction of the small intestine for which an emergency exploratory laparotomy was performed. The small intestine, which had passed through a defect between the lifted sigmoid colon and the left abdominal wall, was strangulated by the lifted sigmoid colon. We performed partial resection of the small intestine. The patient died on postoperative day 32 of acute deterioration of aortic valve stenosis. There have been few reports of strangulated bowel obstruction resulting from internal hernia associated with colostomy. These findings demonstrate that it is important to select the appropriate route for colostomy creation in each case.

Published
2023

49. [A Case of Liver Metastasis Complete Resection for Concurrent Overlapping Cancer of the Transverse Colon and Renal Cell Carcinomas that were Difficult to Differentiate from Hepatocellular Carcinoma].

Author

Mizuno T, Matsushita K, Komori T, Uchiyama Y, Kawai K, Kobayashi T, Saso K, Kishi K, Yokoyama S, and Fukunaga M

Subjects
Male, Humans, Aged, Carcinoma, Hepatocellular secondary, Liver Neoplasms secondary, Colon, Transverse surgery, Carcinoma, Renal Cell surgery, Colonic Neoplasms surgery, Kidney Neoplasms surgery, Kidney Neoplasms pathology
Abstract

A 79-year-old man visited the hospital because of constipation. Colonoscopy showed a transverse colon carcinoma. Dynamic CT showed a renal neoplastic lesion and 2 lesions in the liver with early staining and late wash out, and the liver lesions showed ring enhancement on EOB-MRI. The preoperative diagnosis was either transverse colon cancer, renal cell carcinoma, hepatocellular carcinoma, or metastatic liver cancer. The patient underwent partial transverse colon resection, partial right nephrectomy, and partial hepatic resection. Additional to the 2 liver lesions in S6, an intraoperative ultrasound showed 1 tumor in S5; therefore, 3 partial hepatectomies were performed. Histopathological findings revealed that the tumors in S5 and S6 were liver metastases of transverse colon cancer and renal cell carcinoma, respectively. The final diagnosis was transverse colon cancer, pT4a, pN0, pM1, pStage Ⅳa and papillary renal cell carcinoma, pT1a, pN0, pM1, pStage Ⅳ. For 9 months postoperatively, there was no apparent recurrence.

Published
2022

50. [A Case of Retroperitoneal Leiomyosarcoma Resected Radically by Pancreaticoduodenectomy with Vascular Resection].

Author

Matsushita K, Yokoyama S, Uchiyama Y, Mizuno T, Kawai K, Kobayashi T, Saso K, Komori T, Kishi K, Oka K, and Fukunaga M

Subjects
Female, Humans, Middle Aged, Pancreaticoduodenectomy, Vena Cava, Inferior surgery, Vena Cava, Inferior pathology, Retroperitoneal Neoplasms diagnostic imaging, Retroperitoneal Neoplasms surgery, Retroperitoneal Neoplasms pathology, Leiomyosarcoma diagnostic imaging, Leiomyosarcoma surgery, Leiomyosarcoma blood supply, Liver Neoplasms surgery, Hydronephrosis
Abstract

A 54-year-old woman visited to a doctor nearby medical clinic complaining of loss of appetite. She was diagnosed with right hydronephrosis on abdominal ultrasonography, and referred to our hospital for further examination. Contrast abdominal computed tomography(CT)revealed that a 6.2 cm tumor with a contrast-enhancing effect inside in the retroperitoneum near the lower pole of the right kidney. She was diagnosed with hydronephrosis due to infiltration of the right kidney of a retroperitoneal tumor. The tumor was suspected of invading the duodenum and inferior vena cava, but no obvious lymph node or distant metastasis was observed. Abdominal MRI revealed a tumor showed hyperintensity on T2-weighted and diffusion-weighted images. We performed pancreaticoduodenectomy with inferior vena cava resection and right nephrectomy. The pathological diagnosis was leiomyosarcoma originating from retroperitoneum and pT2, pN0, pM0, pStage ⅢA. The postoperative course was good, and she was discharged 10 days after the operation. Thoracoabdominal CT showed a tumor 4 cm at the hepatic hilum three months after surgery, and EOB-MRI showed many tumors other than the same site, so multiple liver metastases were diagnosed as recurrence. Doxorubicin has been started and is still being treated.

Published
2022

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