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Purpose: The presence of a flow-related signal in the normal dural sinus time of flight magnetic resonance angiography (TOF MRA) is common. This study aimed to identify changes in signal intensity in the dural sinus caused by changes in patient position. Materials and Methods: The researchers performed an elevation TOF MRA of the cerebral region in 52 patients, who showed abnormal flow-related signals in the dural sinuses on supine position. Flow-related signal intensity in the dural sinuses was then analyzed. Results: Flow-related signals were seen in 114 sites (52 patients), specifically in the internal jugular vein (IJV), sigmoid sinus (SS), inferior petrosal sinus (IPS), and cavernous sinus (CS) in 29 sites, 33 sites, 32 sites, and 20 sites, respectively. After head elevation, flow-related signal changes were then observed in the IJV, SS, IPS, and CS in 107 sites (107/114, 93.9%). There was loss of signal (62/114, 54.4%), or decrease (39/114, 34.2%), increase (6/114, 5.3%), or no change (7/114, 6.1%) in the signal intensity, and flow related signals were more frequent on the left than on the right. Conclusion: Flow-related signals in the dural sinuses on TOF MRA were decreased or disappeared by head elevation in 88.6% of the sites. Head elevation may help distinguish between pathologic and physiologic states. [ABSTRACT FROM AUTHOR]

Purpose: To compare the mid-term follow-up angiographic findings in distal internal carotid artery (ICA) aneurysms treated by stent-assisted coil embolization using the Enterprise or Neuroform stent. Materials and Methods: We included 68 patients with 70 aneurysms: 31 cases with Enterprise and 39 cases with Neuroform. Inclusion criteria were 1) location of the stent within the distal ICA, including the carotid siphon; 2) follow-up angiogram after > 6 months, and 3) single use of the stent for 1 parent artery. Results: The patients' mean age was 54.9 years (16 male and 52 female). Mean follow-up duration was 9.1 months. At follow-up, there were intraluminal filling defects of the parent artery in 19.4% of the Enterprise group and no filling defect in the Neuroform group. There was no significant in-stent stenosis in either group. Straightening of the parent artery was seen in 35.5% of the Enterprise group and 20.5% of the Neuroform group. Two Enterprise cases showed delayed migration. Conclusion: The Enterprise showed statistically significant intraluminal filling defects of the parent artery compared with the Neuroform. The rates of significant instent stenosis and straightening of the parent artery were not significantly different between the Enterprise and the Neuroform groups. [ABSTRACT FROM AUTHOR]