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Rinkel, G.J.E., Wijdicks, E.F.M., Hasan, D., et al. (1991) Outcome in patients with subarachnoid haemorrhage and negative angiography according to pattern of haemorrhage on computed tomography. Lancet, 338, 964-968. doi:10.1016/0140-6736(91)91836-J

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• TITLE: A minor perimesencephalic subarachnoid hemorrhage on CT changes

  AUTHORS: Yeting Zhou, Daoming Tong

  KEYWORDS: Headache; Perimesencephalic Subarachnoid Hemorrhage; CT Imaging; Lumbar Puncture; Angiography

  JOURNAL NAME: World Journal of Neuroscience, Vol.1 No.2, August 31, 2011

  ABSTRACT: Despite the increasing number of reports of patients with perimesencephalic subarachnoid hemorrhage (PMSAH), a minor or atypical PMSAH on CT changes has not been reported. We present the first described case of a minor subarachnoid hemorrhage located in the right perimesencephalic cistern on CT 4 h after headache onset. Twenty-six hours after headache on-set, another CT of the head showed that blood dis-persion. On the third day in hospital, examination of cerebrospinal fluid revealed xanthochromia. Minor PMSAH is rare type of SAH, and can been missed if there is a delay in CT imaging of the head. Any pa-tient with a suspected minor PMSAH or equivocal results on CT should undergo routine lumbar punc-ture.