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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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