Masaaki Usui

1.6k total citations
33 papers, 1.2k citations indexed

About

Masaaki Usui is a scholar working on Neurology, Epidemiology and Surgery. According to data from OpenAlex, Masaaki Usui has authored 33 papers receiving a total of 1.2k indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Neurology, 13 papers in Epidemiology and 10 papers in Surgery. Recurrent topics in Masaaki Usui's work include Intracranial Aneurysms: Treatment and Complications (9 papers), Pituitary Gland Disorders and Treatments (9 papers) and Meningioma and schwannoma management (7 papers). Masaaki Usui is often cited by papers focused on Intracranial Aneurysms: Treatment and Complications (9 papers), Pituitary Gland Disorders and Treatments (9 papers) and Meningioma and schwannoma management (7 papers). Masaaki Usui collaborates with scholars based in Japan, United States and Pakistan. Masaaki Usui's co-authors include Takaaki Kirino, Tomoki Todo, Kazuo Tsutsumi, Kintomo Takakura, Keisuke Ueki, Shozo Yamada, Akio Morita, Nobuhito Saito, Akira Iijima and Katsumi Hoya and has published in prestigious journals such as The Journal of Clinical Endocrinology & Metabolism, Stroke and Journal of neurosurgery.

In The Last Decade

Masaaki Usui

33 papers receiving 1.2k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Masaaki Usui Japan 17 774 289 269 218 204 33 1.2k
Ralf Buhl Germany 22 608 0.8× 281 1.0× 399 1.5× 202 0.9× 95 0.5× 49 1.1k
Franco Ammannati Italy 18 558 0.7× 157 0.5× 332 1.2× 152 0.7× 136 0.7× 65 998
Luigi Cervoni Italy 19 594 0.8× 385 1.3× 525 2.0× 304 1.4× 135 0.7× 44 1.2k
T. Civit France 14 561 0.7× 208 0.7× 237 0.9× 177 0.8× 199 1.0× 56 979
Takuya Akai Japan 17 508 0.7× 337 1.2× 221 0.8× 177 0.8× 64 0.3× 97 1.0k
R D Battersby United Kingdom 14 429 0.6× 178 0.6× 324 1.2× 82 0.4× 169 0.8× 23 727
Emanuela Caroli Italy 23 750 1.0× 693 2.4× 471 1.8× 272 1.2× 96 0.5× 54 1.6k
David Scheie Denmark 17 632 0.8× 386 1.3× 617 2.3× 145 0.7× 197 1.0× 47 1.1k
Manolo Piccirilli Italy 18 435 0.6× 507 1.8× 347 1.3× 235 1.1× 82 0.4× 55 1.2k
Shanna Fang United States 18 491 0.6× 223 0.8× 483 1.8× 89 0.4× 163 0.8× 24 1.1k

Countries citing papers authored by Masaaki Usui

Since Specialization
Citations

This map shows the geographic impact of Masaaki Usui'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 Masaaki Usui with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Masaaki Usui more than expected).

Fields of papers citing papers by Masaaki Usui

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Masaaki Usui. 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 Masaaki Usui. The network helps show where Masaaki Usui may publish in the future.

Co-authorship network of co-authors of Masaaki Usui

This figure shows the co-authorship network connecting the top 25 collaborators of Masaaki Usui. A scholar is included among the top collaborators of Masaaki Usui 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 Masaaki Usui. Masaaki Usui is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Nakatomi, Hirofumi, Hidemi Miyazaki, Minoru Tanaka, et al.. (2014). Improved preservation of function during acoustic neuroma surgery. Journal of neurosurgery. 122(1). 24–33. 32 indexed citations
2.
Takai, Keisuke & Masaaki Usui. (2012). Spontaneous Thrombosis of a Spinal Conus Perimedullary Arteriovenous Fistula. Neurologia medico-chirurgica. 52(2). 103–106. 9 indexed citations
3.
Nishioka, Hiroshi, Takayuki Hara, Masaaki Usui, Noriaki Fukuhara, & Shozo Yamada. (2011). Simultaneous Combined Supra-Infrasellar Approach for Giant/Large Multilobulated Pituitary Adenomas. World Neurosurgery. 77(3-4). 533–539. 62 indexed citations
4.
Kim, Kyongsong, Shozo Yamada, Masaaki Usui, & Toshiaki Sano. (2005). Co-localization of Honeycomb Golgi and ACTH Granules in a Giant ACTH-Producing Pituitary Adenoma. Endocrine Pathology. 16(3). 239–244. 3 indexed citations
5.
Oyama, Kenichi, Shozo Yamada, Masaaki Usui, & Kálmán Kovács. (2005). Sellar Neuroblastoma Mimicking Pituitary Adenoma. Pituitary. 8(2). 109–114. 21 indexed citations
6.
Kim, Kyongsong, Shozo Yamada, Masaaki Usui, & Toshiaki Sano. (2004). Preoperative identification of clearly separated double pituitary adenomas. Clinical Endocrinology. 61(1). 26–30. 31 indexed citations
7.
Fukino, Koichi, Shozo Yamada, Takahiro Ohta, Koji Takada, & Masaaki Usui. (2003). Serial MR Intensity Changes of the Posterior Pituitary in Patients with Diabetes Insipidus After Transsphenoidal Surgery for Pituitary Adenomas: Report of Two Cases. Pituitary. 6(4). 215–219. 4 indexed citations
8.
Yamada, Shozo, et al.. (2002). Less-Invasive Sublabial Unilateral Transseptal Approach for Transsphenoidal Surgery. Technical Note.. Neurologia medico-chirurgica. 42(7). 318–322. 3 indexed citations
9.
Samejima, N, Shozo Yamada, Koji Takada, et al.. (2001). Serum α‐subunit levels in patients with pituitary adenomas. Clinical Endocrinology. 54(4). 479–484. 13 indexed citations
10.
Usui, Masaaki, et al.. (1999). “Picture-in-picture” endoscopic images in the microscope. Neurosurgical FOCUS. 6(4). E12–E12. 3 indexed citations
11.
Yamada, Shozo, Yuzo Endo, Takanori Hirose, et al.. (1998). Autopsy Findings in a Long-term Survivor With Glioblastoma Multiforme —Case Report—. Neurologia medico-chirurgica. 38(2). 95–99. 6 indexed citations
12.
Yamada, Shozo, Katsuhiko Yoshimoto, Toshiaki Sano, et al.. (1997). Inactivation of the Tumor Suppressor Gene on 11q13 in Brothers with Familial Acrogigantism without Multiple Endocrine Neoplasia Type 11. The Journal of Clinical Endocrinology & Metabolism. 82(1). 239–242. 55 indexed citations
13.
Tsutsumi, Kazuo, et al.. (1997). The relationship of preoperative magnetic resonance imaging findings and closed system drainage in the recurrence of chronic subdural hematoma. Journal of neurosurgery. 87(6). 870–875. 145 indexed citations
14.
Usui, Masaaki, et al.. (1997). Natural history of avascular necrosis of the femoral head in systemic lupus erythematosus. Journal of Orthopaedic Science. 2(1). 10–15. 1 indexed citations
15.
Maeda, Kei‐ichiro, Masaaki Usui, Kazuo Tsutsumi, & Akira Iijima. (1997). Spontaneous Occlusion of a Giant Basilar Tip Aneurysm and a Basilar Artery Due to the Dissection of Both Structures: Case Report. Surgical Neurology. 48(6). 606–609. 9 indexed citations
16.
Yamada, Shozo, Masayuki Hara, Atsuhiko Hattori, et al.. (1996). Pit‐1 gene expression in human pituitary adenomas using the reverse transcription polymerase chain reaction method. Clinical Endocrinology. 45(3). 263–272. 20 indexed citations
17.
Sasaki, Tomio, Tomio Ohta, Haruhiko Kikuchi, et al.. (1994). A Phase II Clinical Trial of Recombinant Human Tissue-type Plasminogen Activator against Cerebral Vasospasm after Aneurysmal Subarachnoid Hemorrhage. Neurosurgery. 35(4). 597???605–597???605. 5 indexed citations
18.
Todo, Tomoki, et al.. (1993). Dandy Walker Syndrome Forming a Giant Occipital Meningocele —Case Report—. Neurologia medico-chirurgica. 33(12). 845–850. 11 indexed citations
19.
Todo, Tomoki, Masaaki Usui, & Kazuo Nagashima. (1992). Cerebral metastasis of malignant cardiac myxoma. Surgical Neurology. 37(5). 374–379. 19 indexed citations
20.
Todo, Tomoki, Masaaki Usui, & Kintomo Takakura. (1991). Treatment of severe intraventricular hemorrhage by intraventricular infusion of urokinase. Journal of neurosurgery. 74(1). 81–86. 145 indexed citations

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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