Yoshifumi Ogasawara¹, Keisuke Onoda²*, Chehyon Son¹, Hidehiro Okura¹, Ichirou Nakazato¹ and Akira Matsuno²

¹Department of Neurosurgery, Shinnmatudo Central General Hospital, Japan
²Department of Neurosurgery, International University Health and Welfare, Narita Hospital, Japan

*Corresponding Author: Keisuke Onoda, Department of Neurosurgery, International University of Health and Welfare, Narita Hospital, Japan.

Received: February 04, 2025; Published: February 28, 2025

Abstract

We report a case of subarachnoid hemorrhage in which the hemorrhage source was unidentified by cerebral angiography in the acute phase but was diagnosed via magnetic resonance imaging (MRI) six months later.

A 37-year-old man with sudden posterior cervical pain and vomiting was admitted to our emergency clinic. A computed tomography (CT) scan of the head revealed subarachnoid hemorrhage. The 3-dimensional CT angiography was performed on the same day of admission, and cerebral angiography was performed the next day. However, the hemorrhage source could not be identified. MRI was performed on the fourth day, and cerebral angiography was performed again on the 11th day; however, no diagnosis was made. Three weeks following the onset, the patient’s symptoms improved. The patient was subsequently discharged from the hospital and followed up in an outpatient clinic. Six months later, a head MRI revealed a 4.8-mm long aneurysm in the right internal carotid artery, and rupture of a dissecting cerebral aneurysm was suspected to be the cause of the subarachnoid hemorrhage. In instances where the bleeding source is not identified in the acute phase, the diagnosis of a dissecting aneurysm should be considered a possibility and strict long-term follow-up is required.

 Keywords: Subarachnoid Hemorrhage; Unknown Subarachnoid Hemorrhage Etiology; Dissection Aneurysm

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Citation

Citation: Keisuke Onoda., et al. “A Case of Subarachnoid Hemorrhage in Which the Bleeding Source was Identified Six Months after Disease Onset”. Acta Scientific Neurology 8.3 (2025): 39-42.

Copyright

Copyright: © 2025 Keisuke Onoda., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.