PMC9817098_01
MRI of the brain with and without contrast. (A) The left CS lesion was approximately 34 mm x 30 mm in size with a clear boundary but showed mixed signals that were mostly hyperintense on T1-weighted imaging. (B) Hypointense signals can be seen on T2-weighted imaging. (C) Heterogeneous signals appeared on DWI. (E-G) No obvious gadolinium enhancement was noted. (D) DSA confirmed that the embolization effect on the aneurysm was satisfactory and the shape of other intracranial vessels was smooth. (H) Endoscopic findings revealed that the lesion contents comprised tan mushy substances.
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Two years after the aneurysm embolization, brain MRI demonstrated that the lesion had increased ( Figure 1 ).