Evaluation of Cerebral Aneurysms with High-Resolution MR Angiography Using a Section-Interpolation Technique: Correlation with Digital Subtraction Angiography
Tae-Sub Chung
,a,
Jin-Yang Jooa,
Seung-Koo Leea,
Daisy Chiena and
Gerhard Lauba
a From the Department of Diagnostic Radiology (T.-S.C., S.-K.L.) and Neurosurgery (J.-Y.J.), Yong Dong Severance Hospital, Yonsei University College of Medicine, Dogok-Dong, KangNam-Ku, Seoul, South Korea; Siemens Ltd, Asia Product Center, Wanchai, Hong Kong (D.C.); and MR Applications Development, Siemens AG, Erlangen, Germany (G.L.).
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FIG 1. Case 25: 28-year-old man with SAH.
A and B, DSA (A) and MR angiogram (B) immediately after SAH reveal a 1-mm aneurysm (arrow) at the paraclinoid portion of the internal cerebral artery, which was missed at initial examination and was detected on review at a follow-up examination 2 weeks later.
C and D, Two-week follow-up examination with DSA (C) and MR angiography (D) reveals a 3-mm aneurysm (arrow) in the same area. The size of the aneurysm grew rapidly during those 2 weeks. The aneurysm was confirmed and clipped during surgery.
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FIG 2. Case 9: 53-year-old man with an unruptured aneurysm on a screening test.
A, DSA image reveals a small aneurysm less than 2 mm (arrow) at the superior border of the AcomA.
B, MIP MR angiogram shows a small aneurysmal sac (arrow) at the AcomA.
C, Magnified MPR image shows a small outpouching of vessel lumen (arrow) at the same site of the AcomA that was confirmed during surgery to be an unruptured aneurysm.
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FIG 3. Case 21: 39-year-old woman with SAH.
A, DSA image reveals a 1-mm aneurysmal sac (arrow) at the superior border of the right side bifurcation area of the MCA.
B, Magnified MIP MR angiogram shows superior direction of the small aneurysmal sac (arrow) at the same site.
C, Magnified MPR image shows a small projection of vessel lumen (arrow) at the same site of the right bifurcation of the MCA.
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FIG 4. Case 12: 69-year-old woman with SAH.
A, DSA image reveals a 7-mm aneurysm with daughter sac (arrow) at the left AcomA.
B, MIP MR angiogram shows a multilobulated aneurysmal sac (arrow) at the left AcomA.
C, 3-mm-thick MPR image shows a multilobulated aneurysmal sac with aneurysmal neck and parent artery more clearly than the DSA image.
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FIG 5. Case 10: 58-year-old woman with SAH.
A, DSA image reveals an 8-mm aneurysmal sac (arrow) at the left AcomA. The neck of the aneurysm and the relationship to the parent vessel were not clearly identified with DSA.
B, Aneurysmal sac is not clearly seen on routine MR angiogram of both ICAs and ACAs.
C, Magnified MIP MR angiogram shows a good relationship among the aneurysmal sac, the A2 portion of the right ACA (small arrows), the A2 portion of the left ACA (arrowheads), and the A1 portion of the left ACA (large arrow).
D, Magnified MPR image shows the broad neck of an aneurysm at the AcomA, and good visualization of the right (arrow) and left (arrowheads) A2 portions of the ACAs. Decreased signal intensity in the aneurysmal sac because of turbulent flow was noted on the MPR image.
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