PMC6763665_01
(a) Magnetic resonance angiography (MRA) shows a 1-mm right middle cerebral artery aneurysm in case 1 (arrow). (b) MRA shows growth of the aneurysm to 2 mm. (c) MRA shows growth of the aneurysm to 3.3 mm. (d) MRA shows rapid growth of the aneurysm just before rupture.
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F1
A 1-mm right middle cerebral artery aneurysm was incidentally revealed in a 63-year-old woman on MRI [Figure 1].
PMC6763665_02
(a) Magnetic resonance angiography (MRA) shows small left internal carotid-posterior communicating artery aneurysm in case 2 (4 mm; arrow). (b) MRA shows growth of the aneurysm to 5 mm. (c) MRA shows rapid growth of the aneurysm just before rupture.
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F2
Subsequent MRIs performed every 6 or 12 months revealed no significant changes in the aneurysm size [Figure 2].