MRI and phase-contrast MRA after selective Guglielmi detachable coil embolisation for intracranial aneurysms: preliminary results
We prospectively examined the utility of MRI (0.5 T) and of MRA in patients who underwent Guglielmi detachable coil (GDC) embolisation for intracranial aneurysms, postembolisation digital subtraction angiography serving as the standard. Fourteen patients with 16 aneurysms were treated. Thirteen aneurysms were small (<12mm), 2 were large (12–25 mm) and 1 was giant (>25mm). MRI and MRA, using the phasecontrast technique, were performed in all cases at a mean postembolisation interval of 3.7 days. On T1- and T2-weighted images, the artefacts produced in most cases had a characteristic appearance. MRI is better than CT, particularly for demonstrating small zones of ischaemia. MRI and (phase contrast) MRA are not accurate in assessing residual lumen, but the parent vessel may be asseessed by MRA.
Key wordsIntracranial aneurysm Detachable coil MRA postoperative MRI
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