To evaluate the reliability of magnetic resonance angiography for detecting intracranial aneurysms a prospective study was performed in 21 consecutive patients affected by SAH and in 13 patients in whom aneurysms were suspected on standard SE RM. In the SAH cohort 8 of 21 clearly showed an aneurysm, 3 of 21 were doubtfull. In the 13 patients without SAH, aneurysms were confirmed in 12. Due to flow artefacts in the small aneurysms a deceptive pseudoloop pattern was often observed.
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