Updated on 2025/06/03

写真a

 
MARUYAMA Masaki
 
Organization
Academic Assembly Institute of Medicine and Dentistry Specially Appointed Associate Professor
Graduate School of Medical and Dental Sciences Specially Appointed Associate Professor
Title
Specially Appointed Associate Professor
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Degree

  • 医学博士 ( 2007.3 )

Research History

  • Niigata University   Institute of Medicine and Dentistry, Academic Assembly   Specially Appointed Associate Professor

    2025.1

  • Niigata University   Graduate School of Medical and Dental Sciences   Specially Appointed Associate Professor

    2025.1

 

Papers

  • Acute pancreatitis as a rare complication of leptospirosis: A case report and literature review.

    Suguru Miida, Maruyama M, Sato T, Nagoya T, Goto R, Isokawa O, Koizumi N, Terai S

    Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy   2023.12

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    Publishing type:Research paper (scientific journal)  

    Leptospirosis is a zoonotic disease. We present a case of acute pancreatitis associated with leptospirosis. An 88-year-old woman was admitted to the hospital with high fever and severe myalgia of the lower extremities. Based on the clinical presentation, hepatic dysfunction with a mild increase in bilirubin, renal dysfunction, and life history, the possibility of leptospirosis was considered. Plain computed tomography of the trunk on admission revealed no special findings. Appropriate antimicrobial therapy was administered at an early stage. After treatment initiation, the clinical symptoms and blood test abnormalities began to improve, and the patient appeared to be doing well. Although no abdominal or back pain was consistently noted during hospitalization, the serum amylase level increased over time; therefore, the patient underwent another computed tomography scan on the ninth day. Acute pancreatitis, which was absent upon admission, was noted. Appropriate treatment for pancreatitis was administered, and the patient was discharged. A subsequent serum antibody test confirmed the diagnosis of leptospirosis. Herein, we also summarized previous cases of acute pancreatitis associated with leptospirosis. The time of onset for pancreatitis was inconsistent, and there were a few cases of pancreatitis without abdominal or back pain. In contrast, serum amylase or lipase levels were elevated in all patients, which could be an important trigger for suspected complications of pancreatitis. When leptospirosis is suspected, complications of pancreatitis should always be considered, even in the absence of apparent abdominal pain. Regular monitoring of pancreatic enzymes such as amylase and lipase is recommended.

    DOI: 10.1016/j.jiac.2023.11.027

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  • Effectiveness and safety of lubiprostone after switching from stimulant laxatives in elderly patients with chronic constipation

    Masaki Maruyama, Suguru Miida, Toshihiro Sato, Takazumi Kimura, Azuma Watanabe, Hideo Watanabe, Masafumi Nishizawa, Kyohei Horikawa, Takahiro Kajiwara, Yusuke Karasawa, Yuko Hasebe, Kazutaka Nozawa, Shuji Terai

    JGH Open   2023.9

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jgh3.12956

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  • An Unusual Case of Gastrointestinal Bleeding; Which Is the Bleeding Origin, Upper or Lower Digestive Tract?

    Natsui K, Maruyama M, Terai S

    Gastro hep advances   2023.5

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.gastha.2023.05.006

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  • Duodenal Diverticular Bleeding Treated with Endoscopy or Transcatheter Arterial Embolization: A Report of Two Cases and a Literature Review.

    Kojima K, Natsui K, Sato T, Sugita M, Goto R, Nakajima N, Maruyama M, Isokawa O, Terai S

    Internal medicine (Tokyo, Japan)   2023.4

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    Publishing type:Research paper (scientific journal)  

    Duodenal diverticular bleeding (DDB) is extremely rare. We herein report 2 life-threatening cases of DDB successfully treated with endoscopy or transcatheter arterial embolization (TAE) and review 13 cases of DDB reported from Japan. When upper gastrointestinal bleeding of unknown origin is encountered in middle-aged or older adults, DDB should be included in the differential diagnosis. DDB often causes massive bleeding. It is therefore important to judge which is safer and more effective, endoscopy or TAE, based on the general condition of the patient. In addition, it is critical to attempt hemostasis via various strategies, including different gastroscopes and hemostatic devices.

    DOI: 10.2169/internalmedicine.1742-23

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  • A difficult-to-diagnose case of Borrmann type IV gastric cancer with marked transverse colon stenosis.

    Kazuki Natsui, Maruyama M, Shuji Terai

    JGH open : an open access journal of gastroenterology and hepatology   2022.10

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    We report a difficult-to-diagnose case of Borrmann type IV gastric cancer with poor typical findings and marked colonic stenosis in a 47-year-old man and present a literature review.

    DOI: 10.1002/jgh3.12832

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  • Intrahepatic Bile Duct Foreign Body With Cholangitis After Pylorus-preserving Pancreatoduodenectomy: Is It a Fish Bone?

    Kazuki Natsui, Maruyama M, Shuji Terai

    Gastroenterology   2022.5

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1053/j.gastro.2022.05.017

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  • A Case of Acute Necrotizing Esophagitis With Effective Steroid Therapy for Stenosis Prevention

    Kazuki Natsui, Masaki Maruyama, Shuji Terai

    Gastro Hep Advances   1 ( 6 )   974 - 975   2022

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.gastha.2022.05.012

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  • The Management of Constipation: Current Status and Future Prospects

    Masaki Maruyama, Kenya Kamimura, Moeno Sugita, Nao Nakajima, Yoshifumi Takahashi, Osamu Isokawa, Shuji Terai

    Constipation   2019.10

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    Publisher:{IntechOpen}  

    DOI: 10.5772/intechopen.83467

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  • Endoscopic ultrasound-guided internalization of a pancreaticocutaneous fistula utilizing a balloon-target technique: A case report.

    Imai M, Takahashi Y, Sato T, Maruyama M, Isokawa O

    Medicine   2018.12

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1097/MD.0000000000013564

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  • The factors influencing long-term outcomes of stenting for malignant colorectal obstruction in elderly group in community medicine

    Michitaka Imai, Kenya Kamimura, Yoshifumi Takahashi, Toshihiro Sato, Osamu Isokawa, Masaki Maruyama, Takamasa Kobayashi, Kazunao Hayashi, Shuji Terai

    International Journal of Colorectal Disease   33 ( 2 )   189 - 197   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    DOI: 10.1007/s00384-017-2946-x

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  • Effect of Helicobacter pylori eradication on elder cases: Observational study in community-based medicine.

    Maruyama M, Kamimura K, Hoshiyama A, Hoshiyama K, Hoshiyama M, Hoshiyama Y, Terai S

    World journal of clinical cases   2017.12

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.12998/wjcc.v5.i12.412

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  • Diagnosis and Management of Giant Hepatic Hemangioma: The Usefulness of Contrast-Enhanced Ultrasonography

    Masaki Maruyama, Osamu Isokawa, Koki Hoshiyama, Ayako Hoshiyama, Mari Hoshiyama, Yoshihiro Hoshiyama

    International Journal of Hepatology   2013   1 - 6   2013

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    Publishing type:Research paper (scientific journal)   Publisher:Hindawi Publishing Corporation  

    DOI: 10.1155/2013/802180

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  • Early upsurge in anti-HBs titer possibly caused by the immunomodulative, not by the mutagenetic effect of interferon and ribavirin

    Yamazaki, K., Ohkoshi, S., Maruyama, M., Aoki, Y.-H., Yano, M., Kurita, S., Suzuki, K., Matsuda, Y., Sugimura, K., Aoyagi, Y.

    Hepatology Research   37 ( 6 )   2007

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1111/j.1872-034X.2007.00059.x

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  • Multi-step lymphomagenesis deduced from DNA changes in thymic lymphomas and atrophic thymuses at various times after γ-irradiation

    Ohi, H., Mishima, Y., Kamimura, K., Maruyama, M., Sasai, K., Kominami, R.

    Oncogene   26 ( 36 )   2007

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/sj.onc.1210325

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  • Mtf-1 lymphoma-susceptibility locus affects retention of large thymocytes with high ROS levels in mice after γ-irradiation

    Maruyama, M., Yamamoto, T., Kohara, Y., Katsuragi, Y., Mishima, Y., Aoyagi, Y., Kominami, R.

    Biochemical and Biophysical Research Communications   354 ( 1 )   2007

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.bbrc.2006.12.192

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  • Predisposition to mouse thymic lymphomas in response to ionizing radiation depends on variant alleles encoding metal-responsive transcription factor-1 (Mtf-1)

    Tamura, Y., Maruyama, M., Mishima, Y., Fujisawa, H., Obata, M., Kodama, Y., Yoshikai, Y., Aoyagi, Y., Niwa, O., Schaffner, W., Kominami, R.

    Oncogene   24 ( 3 )   2005

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/sj.onc.1208197

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