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FIG 2. Case 21. rCBF maps for a Cognard type IV lesion in an asymptomatic patient.
A and B, Before surgery, resting rCBF in the right frontal region (white outline) is low (A), and the response of rCBF to the acetazolamide challenge is limited (B).
C and D, At 6 months after surgery, resting rCBF (C) and the response of rCBF (D) to the acetazolamide challenge is increased.
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