Keiichi Yamada
Research Subjects
Keiichi Yamada has a total of 7 co-authors. Here are the top co-authors by number of shared publications:
- Daiji Ogawa
Department of Neurosurgery, Kouzenkai Yagi Neurosurgical Hospital, Osaka, Osaka, Japan
1 shared publication - Hirokatsu Taniguchi
Department of Neurosurgery, Kouzenkai Yagi Neurosurgical Hospital, Osaka, Osaka, Japan
1 shared publication - Masahiko Wanibuchi
Department of Neurosurgery, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan
1 shared publication - Norihito Fukawa
Department of Neurosurgery, Kouzenkai Yagi Neurosurgical Hospital, Osaka, Osaka, Japan
1 shared publication - Ryokichi Yagi
Department of Neurosurgery, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan
1 shared publication - Seigo Kimura
Department of Neurosurgery, Kouzenkai Yagi Neurosurgical Hospital, Osaka, Osaka, Japan
1 shared publication
Latest Publications
- Open Access
- 1 January 2026
- Published by The Japanese Society for Neuroendovascular Therapy in Journal of Neuroendovascular Therapy
- Vol. 20 (1)
Ruptured Internal Carotid Artery–Ophthalmic Artery Aneurysm Associated with Medial Deviation of the Internal Carotid Artery at the C2 Segment: A Case Report
Objective: We report a ruptured internal carotid artery–ophthalmic artery (ICA–OphA) aneurysm in which morphological variation of the C2 segment, including marked medial deviation of the ICA, was suggested to be associated with aneurysm formation and may have influenced the endovascular strategy.Case Presentation: A 52-year-old woman presented with subarachnoid hemorrhage. CTA revealed a right ICA–OphA aneurysm accompanied by pronounced medial deviation of the right ICA at the C2 segment. This deviation created an acutely angled ICA–OphA bifurcation, with the OphA originating from the medial aspect of the ICA. Emergency coil embolization was performed, and the aneurysm was successfully occluded.Conclusion: The patient exhibited well-developed anterior clinoid process and optic strut morphology, which may have contributed to medial deviation of the ICA and to aneurysm formation at the ICA–OphA bifurcation. Recognition of such morphological variations is important because they may obscure OphA visualization and affect device selection. In these settings, preshaped S-type microcatheters may facilitate stable catheterization and safe coil embolization.
- 1 January 2026
- Published by The Japanese Society for Neuroendovascular Therapy in Journal of Neuroendovascular Therapy
- Vol. 20 (1)
Open AccessRuptured Internal Carotid Artery–Ophthalmic Artery Aneurysm Associated with Medial Deviation of the Internal Carotid Artery at the C2 Segment: A Case Report
Objective: We report a ruptured internal carotid artery–ophthalmic artery (ICA–OphA) aneurysm in which morphological variation of the C2 segment, including marked medial deviation of the ICA, was suggested to be associated with aneurysm formation and may have influenced the endovascular strategy.Case Presentation: A 52-year-old woman presented with subarachnoid hemorrhage. CTA revealed a right ICA–OphA aneurysm accompanied by pronounced medial deviation of the right ICA at the C2 segment. This deviation created an acutely angled ICA–OphA bifurcation, with the OphA originating from the medial aspect of the ICA. Emergency coil embolization was performed, and the aneurysm was successfully occluded.Conclusion: The patient exhibited well-developed anterior clinoid process and optic strut morphology, which may have contributed to medial deviation of the ICA and to aneurysm formation at the ICA–OphA bifurcation. Recognition of such morphological variations is important because they may obscure OphA visualization and affect device selection. In these settings, preshaped S-type microcatheters may facilitate stable catheterization and safe coil embolization.