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Figure 3: MRI follow-up: First line (a-d) 1st month, 6th month, 1st year, and 5th-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 6th-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)

Figure 3: MRI follow-up: First line (a-d) 1<sup>st</sup> month, 6<sup>th</sup> month, 1<sup>st</sup> year, and 5<sup>th</sup>-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<sup>th</sup>-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)