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Subarachnoid Hemorrhage of Unknown Origin at Initial Imaging Investigation Asami KIKUCHI 1 , Akihiko HINO 1 , Hideki OKA 1 , Youichi HASHIMOTO 1 , Shigeomi YOKOYA 1 , Yukihiro GOTO 1 , Tadashi ECHIGO 2 , Naoto SHIOMI 2 , Tetsuya KATSUMORI 3 , Hidesato TAKEZAWA 4 , Hidetoshi KASUYA 5 1Department of Neurosurgery, Saiseikai Shiga Hospital 2Emergency Medical Center, Saiseikai Shiga Hospital 3Department of Radiology, Saiseikai Shiga Hospital 4Department of Neurology, Saiseikai Shiga Hospital 5Department of Neurosurgery, Tokyo Women's Medical University Medical Center East Keyword: subarachnoid hemorrhage , negative cerebral angiography , follow-up imaging , vascular disorders , SAH of unknown origin pp.583-592
Published Date 2018/7/10
DOI https://doi.org/10.11477/mf.1436203774
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 In some patients with spontaneous subarachnoid hemorrhage(SAH), initial imaging investigations may not be able to detect a bleeding source;repeat imaging may be necessary to reveal these lesions.

 We reviewed a consecutive series of 45 patients with SAH and negative initial digital subtraction angiograms(DSA)during a 15-year period. The aims were to document the frequency and reason for the negative initial investigations, to determine the appropriate modality and timing of repeat examinations, and to investigate the identified bleeding sources.

 Twenty-eight(62%)patients underwent repeat DSA, 35(78%)underwent magnetic resonance imaging(MRI), and 33(73%)underwent computed tomography angiography(CTA). Nine lesions(5 small aneurysms, 2 craniocervical junction arteriovenous fistulas, 1 arteriovenous malformation, and 1 internal carotid artery dissection)were identified on subsequent DSA after 2-3 weeks. Most aneurysms were identified on an atypical vascular tree. CTA or MRI alone were unable to disclose the culprit lesions.

 In retrospect, human errors including oversight were the major reasons for the negative initial investigation results. It is, however, difficult to search for a tiny vascular lesion that might be anywhere in the cranium. Repeat DSA is still the gold standard for the inspection of hidden bleeding sources in patients with SAH of unknown origin.


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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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