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Images from a patient with a superior hypophyseal aneurysm. A, Anteroposterior (AP) 2D DSA shows the measurement of dome diameter (white line) and neck width (black line). Dome-to-neck ratio for this 2D DSA image is 2.0. B, AP 3DRA from the same patient as in A shows dome diameter (gray line) and neck width (black line). Dome-to-neck ratio for this 3DRA image is 1.7.
