2. Hirota S, Takahashi S, Yoshimura M, Hirai S, Takei T, Orihara A, Sagawa H, Wakabayashi H, Fujii S, Yamamoto S, Sumita K. Mechanical thrombectomy and parent artery occlusion for acute basilar artery occlusion due to vertebral fracture and vertebral artery dissection: a case report. JNET. 2023.08;

Sakyo Hirai , Mariko Ishikawa , Hirotaka Sagawa , Jiro Aoyama , Kyohei Fujita , Shoko Fujii , Hikaru Wakabayashi , Satoru Takahashi , Kazutaka Sumita. Ghost twisting of the dual-layer flow-diverting stent Neuroradiology. 2023.08; 65 (11): 1669-1672. ( PubMed, DOI )

Hirotaka Sagawa, Shoko Fujii, Kyohei Fujita, Sakyo Hirai, Hiroto Yamaoka, Mariko Ishikawa, Jiro Aoyama, Kazutaka Sumita. A case study of the disconnected dual taper tip of the Wingspan stent during percutaneous transluminal angioplasty and stenting of the vertebral artery Clinical Neurology and Neurosurgery. 2023.07; 230 107774. ( PubMed, DOI )

Ishiwada Tadahiro, Fujita Kyohei, Hirai Sakyo, Fujii Shoko, Yamaoka Hiroto, Ishikawa Mariko, Yoshimura Masataka, Shigeta Keigo, Sato Yohei, Sawada Kana, Yamada Kenji, Yamamura Toshihiro, Ishii Yosuke, Obata Yoshiki, Tone Osamu, Hara Mutsuya, Kawano Yoshihisa, Aoyagi Masaru, Nemoto Shigeru, Maehara Taketoshi, Sumita Kazutaka. Influence of Bilateral Cerebellar Infarction on Functional Outcome After Endovascular Treatment for Basilar Artery Occlusion WORLD NEUROSURGERY. 2023.03; 171 E506-E515. ( PubMed, DOI )

Aoyama J, Iha H, Ishikawa M, Sagawa H, Hirai S, Fujita K, Fujii S, Sumita K. A Case of Dural Arteriovenous Fistula Following Cerebral Venous Sinus Thrombosis Associated with the COVID-19 Vaccine. Journal of neuroendovascular therapy. 2023; 18 (1): 24-28. ( PubMed, DOI )

Fujita K, Fujii S, Hirai S, Yamaoka H, Ishikawa M, Karakama J, Miki K, Yoshimura M, Nemoto S, Sumita K. P2Y12 reaction units and ischemic and bleeding events after neuro-endovascular treatment. Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association. 2022.09; 31 (9): 106631. ( PubMed, DOI )

Ueno Hiroshi, Yamaoka Hiroto, Hirai Sakyo, Fujita Kyohei, Ishikawa Mariko, Fujii Shoko, Aizawa Yuki, Ishii Yosuke, Yoshimura Masataka, Yamada Kenji, Yoshino Yoshikazu, Kurata Morito, Seto Katsutoshi, Ishibashi Hironori, Okubo Kenichi, Nemoto Shigeru, Sumita Kazutaka. Endovascular treatment for acute ischemic stroke after video-assisted thoracoscopic pulmonary lobectomy in patients with lung cancer: A report of four cases and literature review JOURNAL OF STROKE & CEREBROVASCULAR DISEASES. 2022.08; 31 (8): 106593. ( PubMed, DOI )

Sakyo Hirai, Hirotaka Sato, Toshihiro Yamamura, Koichi Kato, Mariko Ishikawa, Hirotaka Sagawa, Jiro Aoyama, Shoko Fujii, Kyohei Fujita, Toshinari Arai, Kazutaka Sumita. Correlation between the CT Perfusion Parameter Values and Response to Recanalization in Patients with Acute Ischemic Stroke. J Neuroendovasc Ther. 2022; 16 (12): 577-585. ( PubMed, DOI )

Hiroto Yamaoka, Kyohei Fujita, Shoko Fujii, Fuga Ayabe, Jun Karakama, Sakyo Hirai, Masataka Yoshimura, Shinji Yamamoto, Shigeru Nemoto, Kazutaka Sumita. Clinical Course of Abducens Nerve Palsy in Patients with Ruptured Vertebral Artery Dissecting Aneurysms Journal of Neuroendovascular Therapy. 2021.10;

Kyohei Fujita,Shoko Fujii,Hiroto Yamaoka,Fuga Ayabe,Sakyo Hirai,Kittipong Srivatanakul,Kazutaka Sumita. Results of an International Questionnaire Investigating Changes in Acute Stroke Management between Before and During the COVID-19 Pandemic Journal of Neuroendovascular Therapy. 2021.08; 15 (8): 498-504. ( DOI )

Fujii S, Fujita K, Yamaoka H, Miki K, Hirai S, Nemoto S, Sumita K. Refractory in-stent stenosis after flow diverter stenting associated with delayed cobalt allergic reaction. Journal of neurointerventional surgery. 2021.08; ( PubMed, DOI )

Hirai S, Tanaka Y, Sato H, Kato K, Kim Y, Yamamura T, Sumita K, Arai T. Quantitative collateral assessment evaluated by cerebral blood volume measured by CT perfusion in patients with acute ischemic stroke. Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association. 2021.07; 30 (7): 105797. ( PubMed, DOI )

Sato A, Hirai S, Obata Y, Maehara T, Aoyagi M. Muscular-stage Dissection during Far Lateral Approach and Its Transcondylar Extension. Journal of neurological surgery. Part B, Skull base. 2018.10; 79 (Suppl 4): S356-S361. ( PubMed, DOI )

Hirai S, Inaji M, Tanaka Y, Hara S, Nariai T, Maehara T. Correlation between Clinical Presentations and Hemodynamic Parameters Measured by Dynamic Susceptibility Contrast Magnetic Resonance Imaging in Adult Patients with Moyamoya Disease. Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association. 2017.12; 26 (12): 2814-2820. ( PubMed, DOI )

Hirai S, Saigusa K, Norisue Y, Nemoto S. Cerebral hyperperfusion syndrome after endovascular covered stent grafting for a giant extracranial aneurysm of the internal carotid artery. Journal of vascular surgery cases. 2015.03; 1 (1): 46-49. ( PubMed, DOI )

Intraosseous cystic cavernous angioma with occipital skull osteolysis. Interdiciplinary neurosurgery. 2014;