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Abstract #2183

Prediction of the onset day using by T2*-weighted magnetic resonance imaging in patients with subarachnoid hemorrhage

Takashi Inoue 1 , Miki Fujimura 2 , Kuniyasu Niizuma 2 , and Teiji Tominaga 2

1 Neurosurgery, Sendai Medical Center, Sendai, Miyagi, Japan, 2 Neurosurgery, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan

Timing of the onset of subarachnoid hemorrhage (SAH) is important for treatment decision making, especially as some patients visit hospital several weeks after the onset of SAH. T2*-weighted (T2*W) magnetic resonance (MR) imaging is regarded as a sensitive method for the detection of deoxyhemoglobin or hemosiderin deposits. The abnormal low intensity on T2*W imaging gradually decreased until 90 days from the onset of SAH, but persisted 16 years after the onset. We could predict the day of onset with pure error }10 days in patients with SAH within 90 days of onset, using our grading system for T2*W images.

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