Author(s)

Yeting Zhou, Daoming Tong

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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.

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

Zhou, Y. and Tong, D. (2011) A minor perimesencephalic subarachnoid hemorrhage on CT changes. World Journal of Neuroscience, 1, 28-30. doi: 10.4236/wjns.2011.12004.