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Retrospective review of external follow-up MRI studies (A) MR angiography at age 15 shows no feeder aneurysms. (B) MR angiography at age 19 shows small feeder aneurysm in the right quadrigeminal cistern. (C-E) FLAIR and MR venography at ages 15, 19, and 20 demonstrate progressive narrowing and, by age 20, complete occlusion of the left transverse sinus. (white arrowheads).
