True Vocal Folds. A1, A2: Cross-sectional area, endoscopic, 3D CT (82.0 mm2, 89.8 mm2). B1, B2: Vertical midline diameter, endoscopic, 3D CT (18.8 mm, 21.3 mm). C1, C2: Horizontal midline diameter, endoscopic, 3D CT (4.8 mm, 4.6 mm). D1, D2: Maximum horizontal diameter, endoscopic, 3D CT (5.8 mm, 5.5 mm). Fields of view = 2.