Fig. 10
From: Expert consensus on imaging diagnosis and analysis of early correction of childhood malocclusion
A/N ratio measurement method of adenoid hypertrophy. L1 represents the tangent line along the external surface of the occipital slope; the blue curve indicates the lower border of the adenoid; point A’ is the most convex point on the lower border of the adenoid; the yellow line segment represents the adenoid width, which is the perpendicular distance from point A’ to line L1 (with point D being the foot of the perpendicular). Point PNS is the posterior nasal spine. The nasopharyngeal airway width (N) is the distance between points D and PNS. The green line segment represents the palatine tonsil
