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Fig 4. Grading of the aqueductal visibility. In 1 patient, there is a grade 3 well-visualized aqueduct in both 45° oblique (A) and axial (B) reformats. In another patient, the vestibular aqueduct is judged to be grade 2 (thin but visible) in 45° oblique formats (C), and grade 1 (difficult to see/very thin) on axial reformats (D).
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