Kenichi Oyama

1.3k total citations
56 papers, 963 citations indexed

About

Kenichi Oyama is a scholar working on Surgery, Endocrinology, Diabetes and Metabolism and Epidemiology. According to data from OpenAlex, Kenichi Oyama has authored 56 papers receiving a total of 963 indexed citations (citations by other indexed papers that have themselves been cited), including 31 papers in Surgery, 25 papers in Endocrinology, Diabetes and Metabolism and 23 papers in Epidemiology. Recurrent topics in Kenichi Oyama's work include Pituitary Gland Disorders and Treatments (25 papers), Meningioma and schwannoma management (17 papers) and Head and Neck Surgical Oncology (12 papers). Kenichi Oyama is often cited by papers focused on Pituitary Gland Disorders and Treatments (25 papers), Meningioma and schwannoma management (17 papers) and Head and Neck Surgical Oncology (12 papers). Kenichi Oyama collaborates with scholars based in Japan, United States and France. Kenichi Oyama's co-authors include Shozo Yamada, Noriaki Fukuhara, Akira Takeshita, Akira Teramoto, Naoko Inoshita, Shigeyuki Tahara, Toru Tateno, Yukio Hirata, Yasuharu Takeuchi and Ricardo L. Carrau and has published in prestigious journals such as SHILAP Revista de lepidopterología, ACS Applied Materials & Interfaces and Journal of neurosurgery.

In The Last Decade

Kenichi Oyama

49 papers receiving 944 citations

Peers

Countries citing papers authored by Kenichi Oyama

Since Specialization

Citations

This map shows the geographic impact of Kenichi Oyama's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Kenichi Oyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kenichi Oyama more than expected).

Fields of papers citing papers by Kenichi Oyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kenichi Oyama. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Kenichi Oyama. The network helps show where Kenichi Oyama may publish in the future.

Co-authorship network of co-authors of Kenichi Oyama

This figure shows the co-authorship network connecting the top 25 collaborators of Kenichi Oyama. A scholar is included among the top collaborators of Kenichi Oyama based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Kenichi Oyama. Kenichi Oyama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Analysis of Insulinoma-Associated Protein 1 Expression in Pituitary Neuroendocrine Tumors 2023 ·ACTA HISTOCHEMICA ET CYTOCHEMICA ·(unknown), Chie Inomoto, Kenichi Oyama, Shigeyuki Tahara, R. Yoshiyuki Osamura, Takayuki Shiomi, Akira Matsuno	0
2	Chronic epidural hematoma with frontal skull-base destruction mimicking osteogenic tumor, associated with coagulopathy due to chronic hepatitis C 2023 ·Surgical Neurology International ·(unknown), Hideki Tanaka, Kenichi Oyama, Keisuke Onoda, Akira Matsuno	0
3	Double pituitary neuroendocrine tumors in a patient with normal growth hormone level acromegaly: A case report and review of the literature 2023 ·Surgical Neurology International ·(unknown), Kenichi Oyama, (unknown), Yusuke Tabei, Chie Inomoto, Yoshiyuki Osamura, Akira Teramoto, Akira Matsuno	0
4	A Case of Nervus Intermedius Neuralgia 2020 ·World Neurosurgery ·Keisuke Onoda, (unknown), (unknown), (unknown), (unknown), Takeshi Uno, (unknown), Kenichi Oyama, Akira Matsuno	7
5	Endoscopic Endonasal Approach to the Anteromedial Temporal Fossa and Mobilization of the Lateral Wall of the Cavernous Sinus Through the Inferior Orbital Fissure and V1-V2 Corridor: An Anatomic Study and Clinical Considerations 2018 ·World Neurosurgery ·Shunya Hanakita, Wei‐Chieh Chang, Kentaro Watanabe, (unknown), Moujahed Labidi, Hun Ho Park, Kenichi Oyama, Anne Laure Bernat, Sébastien Froelich	9
6	A Case of Pneumatosis Cystoides Intestinalis during Cetuximab Treatment for Nasopharyngeal Cancer 2014 ·Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association) ·Kuniyuki Kato, Kenichi Oyama, (unknown), T. Sakai, Go Wakabayashi	1
7	Salpingopharyngeus Myomucosal Flap 2014 ·Journal of Craniofacial Surgery ·Ramazan Gün, Kenichi Oyama, (unknown), Liang Wang, (unknown), Bradley A. Otto, Daniel M. Prevedello, Ricardo L. Carrau	5
8	Anatomic comparison of the endonasal and transpetrosal approaches for interpeduncular fossa access 2014 ·Neurosurgical FOCUS ·Kenichi Oyama, Ph.D. Ph.D., Daniel M. Prevedello, Leo F. S. Ditzel Filho, Jun Muto, Ramazan Gün, Edward Kerr, Bradley A. Otto, Ricardo L. Carrau	9
9	Transsphenoidal cyst cisternostomy with a keyhole dural opening for sellar arachnoid cysts: technical note 2013 ·Neurosurgical Review ·Kenichi Oyama, Noriaki Fukuhara, Manabu Taguchi, Akira Takeshita, Yasuhiro Takeuchi, Shozo Yamada	15
10	A case of hemangioma of the small bowel mesentery 2012 ·Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association) ·(unknown), Kenichi Oyama, Yuichiro Takeda, Masayo Komatsu, Go Wakabayashi	0
11	Easy slip-knot: a new simple tying technique for deep sutures 2011 ·Acta Neurochirurgica ·Yudo Ishii, Shigeyuki Tahara, Kenichi Oyama, Takayuki Kitamura, Akira Teramoto	18
12	A JUVENILE CASE OF GASTROINTESTINAL STROMAL TUMOR OF THE SMALL INTESTINE COMPLICATED BY INTUSSUSCEPTION 2010 ·Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association) ·Kuniyuki Kato, (unknown), Kenichi Oyama, Masayo Komatsu	1
13	Repeat Transsphenoidal Surgery for the Treatment of Remaining or Recurring Pituitary Tumors in Acromegaly 2010 ·Neurosurgery ·Shozo Yamada, Noriaki Fukuhara, Kenichi Oyama, Akira Takeshita, Yasuharu Takeuchi	43
14	Ghrelin and leptin levels in cachectic patients with cancer of the digestive organs 2009 ·International Journal of Clinical Oncology ·Masanori Takahashi, Masanori Terashima, Akinori Takagane, Kenichi Oyama, (unknown), Go Wakabayashi	47
15	Differential gene expression in ACTH -secreting and non-functioning pituitary tumors 2007 ·European Journal of Endocrinology ·Toru Tateno, Hajime Izumiyama, Masaru Doi, Takanobu Yoshimoto, Masayoshi Shichiri, Naoko Inoshita, Kenichi Oyama, Shozo Yamada, Yukio Hirata	75
16	A Case of Colobronchial Fistula 14 Years after Total Gastrectomy 2005 ·The Japanese Journal of Gastroenterological Surgery ·Kenichi Oyama, Akinori Takagane, Miyuki Sone, (unknown), (unknown), (unknown), Kazuyoshi Saito	2
17	Immunohistochemical Analysis of RCAS1 in Human Pituitary Adenomas 2001 ·Modern Pathology ·(unknown), (unknown), Kenichi Oyama, Shigeyuki Tahara, Reiko Kurotani, Shoichiro Ikuyama, (unknown), (unknown), R. Yoshiyuki Osamura, Akira Teramoto	9
18	Expression of Interleukin-6, Interleukin-6 Receptor (gp80), and the Receptor's Signal-Transducing Subunit (gp130) in Human Normal Pituitary Glands and Pituitary Adenomas 2001 ·Modern Pathology ·Reiko Kurotani, Masanori Yasuda, Kenichi Oyama, Noboru Egashira, M. Sugaya, Akira Teramoto, R. Yoshiyuki Osamura	24
19	Risk Factors of Postoperative Complication and Prognostic Factors in Aged Patients with Resectable Gastric Cancer by Using Multivariate Analyses. 1999 ·The Japanese Journal of Gastroenterological Surgery ·Akinori Takagane, Masanori Terashima, Hitoshi Yonezawa, Takashi Irinoda, Kaoru Abe, (unknown), (unknown), Kenichi Oyama, (unknown), Kazuyoshi Saito	2
20	Evaluation of the ratio of lymph node metastasis as a prognostic factor in patients with gastric cancer 1999 ·Gastric Cancer ·Akinori Takagane, Masanori Terashima, Kaoru Abe, (unknown), Takashi Irinoda, Hitoshi Yonezawa, (unknown), Toru Inaba, Kenichi Oyama, (unknown), Kazuyoshi Saito	54

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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