الفهرس 
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Abstract
Acute subarachnoid hemorrhage (SAH) has traditionally been diagnosed by Computed Tomography (CT); however, Fluid-Attenuated Inversion Recovery (FLAIR) is a Magnetic Resonance Imaging (MRI) modality currently used to detect acute SAH. CT is less sensitive in the detection of small SAH than FLAR MRI. The purpose of this study was to evaluate the possibility of detecting a small amount of Acute Subarachnoid Hemorrhage diluted by CSF not revealed by CT but identified on Fluid-Attenuated Inversion Recovery (FLAIR) MRI.
METHODS:
from 2012-2013, we collected data for 50 patients (27 women and 23 men, aged 22-82 years) with history suggestive to have SAH. All patients underwent MRI and CT examination, followed by lumber tap examination done in Neurosurgical Unit in Ibin-Senna Hospital which is regarded as standard test for the further 2 tests with an interval less than 12 hours from the onset of event.
RESULTS:
We found that among these 50 patient, 41 proved to have SAH by 3 modalities. The total no. of patients that have traumatic SAH proved by lumber puncture (n=19), while the remaining (n=22), deny a history of trauma. The Interpeduncular and Qudrigeminal cisterne looks to be the most common site of SAH (n=8). More than half of patients (n=24), had history of headache. IVH was seen (n=23) patients, (60.5%) in lateral ventricle (30%) in 3rd ventricle and (9.5%) in 4th ventricle. Intracerebral hemorrhage (n=25), nearly half of them in Frontal lobe. Hypertension seems to be the most common systemic illness associated with SAH (n=6). The FLAIR MRI sensitivity in detection of SAH was (95%), while their specificity (70%) and by Comparism with CT scan, we found that FLAIR MRI more sensitive but less specific than CT which had a sensitivity of (92%) and specificity of (78%). FLAIR MRI appears to be more accurate than CT in detection of SAH which had accuracy of (92%) in Comparism to that of CT which was (70%).
CONCLUSION:
We found that the FLAIR MRI was more sensitive, more accurate in the diagnosis of SAH than CT scan but being less specific than it, their predictive value to prove or exclude SAH being also higher than CT scan, but there was no significant difference statistically between the two test in diagnosis of SAH (p=0.068).
(Key words: FLAIR MRI– SAH)