49.下圖影像箭號處的黑點成因為何?
(A)flow void in a normal patent vessel
(B)flow related enhancement
(C)occluded vessel
(D)microbleed
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統計: A(1491), B(327), C(208), D(97), E(0) #2868117
統計: A(1491), B(327), C(208), D(97), E(0) #2868117