Figure 3: MRI follow-up: First line (a-d) 1^st month, 6^th month, 1^st year, and 5^th-year axial T2W images, second line (e-h) axial T1W contrast-enhanced images of the same examinations. The liquefied thrombus areas (arrows) gradually increased during the follow-up period. Especially on the 6^th-month control MRI (f), severe inflammatory changes and marked contrast enhancement in the aneurysm wall and thrombosed component were observed. This changes regressed in the follow-up period but did not clear away completely (Arrowheads: Contrast enhancement of the aneurysm wall)