Article Figures & Data
Figures
- fig 1.
Digital subtraction angiogram, superselective study of the right internal carotid artery, arterial phase, lateral projection, displays the MCA bifurcation.
A, A small saccular aneurysm (arrow) is seen at the right anterior choroidal artery origin. Note also the minute aneurysm at the MCA bifurcation.
B, On late arterial phase image, a characteristic aneurysmal inflow-outflow pattern (“yin-yang”) may be observed.
- fig 2.
Digital subtraction angiogram, selective study of the right internal carotid artery, arterial phase, lateral projection. After treatment with a single detachable coil, the aneurysmal cavity is totally excluded from the cerebral circulation (arrows).
fig 3. Transcranial Doppler sonogram, right transtemporal approach. Before treatment, a color Doppler signal is seen within the aneurysmal cavity (arrow). It also shows the typical “yin- yang” appearance, corresponding to the inflow and outflow regions of the aneurysm.
- fig 4.
Transcranial Doppler sonogram, right transtemporal approach. After treatment, a twinkling artifact (arrow) is observed immediately behind the hyperechoic signal of the microcoil.
fig 5. In vitro insonation of a Guglielmi detachable coil enclosed within two hydrated agar sheets. Color Doppler image shows the hyperechoic structure of the coil (arrow) and the twinkling artifact (arrowhead).
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