|
FIG 2. A, IA-DSA (right carotid arteriogram) obtained 8 days after SAH. An 8-mm aneurysm (arrowhead) is apparent in the right MCA and a slight vasospasm is seen in the MCA near the aneurysm (long arrows; rating = 1). The left ACA (A1 segment) is hypoplastic (short arrows).
B, MR angiogram (32/8/2; flip angle = 17°) obtained 3 hours before IA-DSA. The presence of methemoglobin (asterisk) decreases the image quality but interpretation is still possible. Only the distal segments beyond the right MCA trifurcation cannot be delineated owing to the superimposition of hyperintense signal arising from methemoglobin. The aneurysm is clearly identified (arrowhead) as well as the narrowing of the right MCA (long arrow; rating = 1) and the hypoplasia of the left ACA (short arrows). Correlation with IA-DSA appearance is excellent.
|